Dysleksja
Etiologia i przyczyny

Dysleksja jest zaburzeniem uczenia się o silnym podłożu genetycznym, zidentyfikowano geny takie jak DCDC2, KIAA0319 i DYX1C1, które predysponują do jej rozwoju, a ryzyko dziedziczenia wynosi 30-50%. Neuroobrazowanie (fMRI, PET) ujawnia zmniejszoną aktywność w lewej półkuli mózgu, zwłaszcza w obszarach dolnego zakrętu czołowego, dolnego płacika ciemieniowego oraz środkowej i brzusznej korze skroniowej, a także dysfunkcje w obszarach V1-V3 i zakręcie wrzecionowatym. Deficyty fonologiczne, w tym trudności w manipulacji dźwiękami mowy, są kluczowym mechanizmem patofizjologicznym, a także obserwuje się zaburzenia w fiksacji wzroku i szybkości przetwarzania informacji. Czynniki środowiskowe, takie jak ekspozycja na metale ciężkie (ołów, mangan), nikotynę, infekcje prenatalne, przedwczesny poród i niska masa urodzeniowa, zwiększają ryzyko rozwoju dysleksji u osób genetycznie predysponowanych.

Etiologia Dysleksji (Dyslexia Etiology)

Dysleksja (Dyslexia) to zaburzenie uczenia się, które sprawia, że czytanie i zadania związane z językiem stają się trudniejsze. Występuje z powodu zakłóceń w przetwarzaniu pisma przez mózg. Dokładna przyczyna dysleksji nie jest w pełni poznana, jednak badania wskazują na złożoną interakcję czynników genetycznych, neurobiologicznych i środowiskowych12.

Czynniki genetyczne w dysleksji

Dysleksja wykazuje silny komponent genetyczny i często występuje rodzinnie. Dziecko, którego jedno z rodziców ma dysleksję, ma 30-50% szans na jej odziedziczenie12. Badania nad bliźniętami wykazały wysoką zgodność występowania dysleksji, co potwierdza jej podłoże genetyczne – u bliźniąt jednojajowych zgodność wynosi około 68%, podczas gdy u bliźniąt dwujajowych około 38%1.

Naukowcy zidentyfikowali kilka genów potencjalnie związanych z dysleksją, w tym geny DCDC2 i KIAA0319 na chromosomie 6 oraz DYX1C1 na chromosomie 1512. W 2022 roku przeprowadzono zakrojone na szeroką skalę badanie, które wykazało 42 warianty genetyczne silnie związane z dysleksją1. Niektóre z tych genów są związane z rozwojem mózgu, inne wpływają na sposób komunikacji w mózgu1.

Ciekawe jest również to, że osoby z dysleksją są uważane za neurodywergentne, co oznacza, że ich mózg ukształtował się lub pracuje inaczej niż typowo1. Schorzenia genetyczne, takie jak zespół Downa, mogą również zwiększać prawdopodobieństwo wystąpienia dysleksji1.

Różnice strukturalne i funkcjonalne w mózgu

Badania z wykorzystaniem technik neuroobrazowania, takich jak funkcjonalny rezonans magnetyczny (fMRI) i pozytronowa tomografia emisyjna (PET), wykazały korelację między funkcjonalnymi i strukturalnymi różnicami w mózgach osób z dysleksją1. Osoby z dysleksją wykazują mniejszą aktywację w częściach lewej półkuli mózgu zaangażowanych w czytanie, takich jak dolny zakręt czołowy, dolny płacik ciemieniowy oraz środkowa i brzuszna kora skroniowa1.

Badania wskazują także na różnice w strukturze mózgu, funkcji i chemii u osób z dysleksją1. Niektóre badania sugerują, że w mózgu osoby z dysleksją występują skupiska komórek, które nie dotarły do tego samego miejsca, co u osób bez dysleksji. W większości mózgów te komórki znajdują się głównie po lewej stronie mózgu, w tym samym obszarze używanym dominująco do czytania i zadań językowych1.

Teoria móżdżkowa dysleksji sugeruje, że upośledzenie kontrolowanego przez móżdżek ruchu mięśni wpływa na formowanie słów przez język i mięśnie twarzy, co skutkuje problemami z płynnością, które dotykają niektóre osoby z dysleksją1. Badacze zauważyli również, że u osób z dysleksją występuje silna aktywność po prawej stronie mózgu podczas wykonywania zadań językowych, które typowo i najefektywniej wykonywane są po lewej stronie mózgu1.

Najnowsze badania z Drezna w Niemczech wykazały, że dysleksja jest związana ze zmianami w funkcji i strukturze specyficznej części ludzkiego mózgu zwanej wzgórzem wzrokowym. Zmiany te są szczególnie widoczne u mężczyzn z dysleksją1.

Przyczyny neurokognitywne

Jedną z głównych przyczyn dysleksji są deficyty w przetwarzaniu fonologicznym, czyli w zdolności rozróżniania i manipulowania dźwiękami mowy11. Teoria deficytu fonologicznego sugeruje, że osoby z dysleksją mają specyficzne upośledzenie manipulacji dźwiękami, co wpływa na ich pamięć słuchową, przypominanie słów i umiejętności kojarzenia dźwięków podczas przetwarzania mowy1.

Teoria szybkiego przetwarzania słuchowego, będąca alternatywą dla teorii deficytu fonologicznego, określa, że pierwotny deficyt leży w percepcji krótkich lub szybko zmieniających się dźwięków1.

Badania wykazały również kilka specyficznych przyczyn upośledzonego czytania, w tym:12:

  • Nieprawidłowa lokalizacja fiksacji wzroku
  • Zbyt krótki czas fiksacji
  • Próba rozpoznania zbyt wielu liter jednocześnie
  • Zbyt duże amplitudy sakad (szybkich ruchów gałek ocznych)
  • Zbyt krótkie czasy reakcji werbalnej

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Zakłada się, że dłuższy wymagany czas fiksacji u czytelników z dysleksją wynika z funkcjonalnego upośledzenia obszarów V1, V2 i V3, które potrzebują więcej czasu do zakończenia sumowania czasowego1. Te obszary, a także obszary otrzymujące od nich dane wejściowe, takie jak zakręt wrzecionowaty, są prawdopodobnie upośledzone w swojej zdolności do jednoczesnego przetwarzania ciągu liter1.

Czynniki środowiskowe

Chociaż dysleksja ma silny komponent genetyczny, czynniki środowiskowe mogą również odgrywać rolę w jej rozwoju12. Infekcje, ekspozycja na toksyny i inne zdarzenia mogą zakłócać rozwój płodu i zwiększać prawdopodobieństwo późniejszego rozwoju dysleksji1.

Ekspozycja na zanieczyszczenia powietrza i wody może zwiększać ryzyko rozwoju dysleksji. Dotyczy to szczególnie metali ciężkich (takich jak ołów lub mangan), nikotyny i niektórych chemikaliów używanych jako środki zmniejszające palność11.

Następujące czynniki stresowe dla zdrowia płodu lub niemowlęcia mogą prowadzić do dysleksji12:

  • Przedwczesny poród
  • Niska masa urodzeniowa
  • Ekspozycja na narkotyki, alkohol lub nikotynę w łonie matki
  • Infekcje
  • Niedotlenienie niemowlęcia
  • Nadciśnienie tętnicze matki

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Częste przeziębienia lub infekcje ucha w pierwszych 3 latach życia mogą upośledzać słuch, pozbawiając rozwijający się mózg niezbędnego czasu na ćwiczenie języka1. Ponadto, ryzyko rozwoju dysleksji jest wyższe u dzieci, które dorastają w gospodarstwach domowych, gdzie czytanie nie jest zachęcane lub gdzie materiał do czytania jest mniej dostępny12.

Dysleksja nabyta

Oprócz dysleksji rozwojowej (genetycznej) istnieje również dysleksja nabyta, która może rozwinąć się u osób, które wcześniej nie miały problemów z czytaniem. Dysleksja nabyta może wystąpić w wyniku urazu mózgu, udaru lub innych urazów12.

Ten rodzaj dysleksji jest również często określany jako dysleksja pourazowa, ponieważ jest spowodowana urazem mózgu i jest jedynym rodzajem dysleksji o znanej przyczynie1. Jest ona znacznie mniej powszechna niż dysleksja dziedziczna1.

Dysleksja może również rozwinąć się w wyniku urazu emocjonalnego. Chociaż istnieje niewiele badań dotyczących tego typu dysleksji, wskazuje się, że wczesna ekspozycja na stresujące okoliczności, takie jak nadużycia emocjonalne, zaniedbanie, katastrofa środowiskowa, znęcanie się, bycie świadkiem katastrofy lub śmierci, itp. może skutkować dysleksją i innymi zaburzeniami uczenia się1.

Typy dysleksji związane z różnymi przyczynami

Badacze specjalizujący się w dysleksji odkryli, że można ją podzielić na różne typy. Dwa z najczęstszych typów to dysleksja wzrokowa i słuchowa, a czasami te dwa zmysły mogą działać nieprawidłowo razem, prowadząc do problemów z dekodowaniem i rozumieniem słów1.

Dysleksja fonologiczna

Dysleksja fonologiczna jest najczęstszym typem tego zaburzenia, często traktowanym jako synonim samej dysleksji1. Ten rodzaj dysleksji charakteryzuje się trudnościami w identyfikacji oddzielnych dźwięków mowy w słowie i/lub uczeniu się, jak litery reprezentują te dźwięki, co jest kluczowym czynnikiem w trudnościach z czytaniem1.

Dysleksja fonologiczna wiąże się z deficytem w komponencie fonologicznym języka, który jest często nieoczekiwany w stosunku do innych zdolności poznawczych i skutecznego nauczania w klasie1. Dysleksja fonologiczna (lub dysfonetyczna) to zaburzenie wieloczynnikowe o złożonej sieci czynników przyczyniających się. Badania z Uniwersytetu Yale zidentyfikowały specyficzny gen, DCDC2, związany z dysleksją, wskazując, że dzieci z historią rodzinną mogą być narażone na większe ryzyko1.

Dysleksja powierzchniowa

Dysleksja powierzchniowa (nazywana również dysleksją wzrokową lub dyseidetyczną) charakteryzuje się trudnościami z rozpoznawaniem całych słów i ich pisownią1. Dysleksja powierzchniowa utrudnia mózgowi rozpoznawanie słów wzrokowo i szybkie ich przetwarzanie1.

Podobnie jak w przypadku większości podtypów dysleksji, nie ma jasnej przyczyny dysleksji powierzchniowej. Niektóre badania sugerują, że może być dziedziczna, ale mogą istnieć inne czynniki ryzyka1.

Dysleksja szybkiego nazywania

Dysleksja szybkiego nazywania wpływa na zdolność do szybkiego wymawiania liter i nazywania liczb lub kolorów, gdy są one prezentowane1. Jest to związane z trudnościami w szybkim przetwarzaniu wizualnych informacji językowych.

Dysleksja podwójnego deficytu

Dysleksja podwójnego deficytu jest stosunkowo rzadkim typem dysleksji, który łączy dwie różne formy trudności w czytaniu1. Ten rodzaj dysleksji może być szczególnie trudny do terapii ze względu na złożoność problemu.

Dysleksja wzrokowa

Dysleksja wzrokowa uniemożliwia mózgowi uzyskanie pełnego obrazu kształtów liter i ich sekwencji1. Badania nad wzrokowymi przyczynami dysleksji mają długą historię – pierwszy przypadek osoby z dysleksją został zgłoszony dopiero w 1896 roku, gdy brytyjski lekarz W. Pringle Morgan opisał 14-letniego chłopca, który nie mógł nauczyć się czytać1.

Niedawne badanie wykazało, że dziwne wzorce receptorów światła w oczach mogą być główną przyczyną dysleksji. Badacze z Uniwersytetu w Rennes odkryli, że komórki odpowiedzialne za pochłanianie przychodzącego światła w oczach są ułożone inaczej u osób ze zdiagnozowaną dysleksją. Osoby z dysleksją wydają się mieć symetryczne układy, przy czym oboje oczu zawiera dokładnie taki sam układ komórek stożkowych. Prowadzi to do identycznych wzorców absorpcji, które mózg widzi jako obrazy lustrzane1.

Koncepcje teoretyczne i badania nad przyczynami dysleksji

Przez ostatnie dekady przedstawiono wiele teorii wyjaśniających naturę dysleksji, ale przyczyny dysleksji pozostawały niejasne1. Poniżej przedstawiono główne koncepcje teoretyczne dotyczące przyczyn dysleksji.

Teoria magnokomórkowa

Teoria magnokomórkowa próbuje zjednoczyć teorię móżdżkową, teorię fonologiczną, teorię szybkiego przetwarzania słuchowego i teorię wzrokową1. Teoria ta proponuje, że dysfunkcja magnokomórkowa nie jest ograniczona tylko do szlaków wzrokowych, ale obejmuje również modalności słuchowe i dotykowe1.

Koncepcja warunków koniecznych i wystarczających

Współczesne badania proponują brak co najmniej jednego warunku koniecznego lub brak wszystkich warunków wystarczających jako przyczyny upośledzonego czytania12. Dysleksję można zatem postrzegać jako upośledzoną zdolność do indywidualnego tworzenia wszystkich niezbędnych warunków do bezbłędnego czytania1.

Sam fakt, że możliwe wpływy są związane z trudnościami w czytaniu, nie pozwala nam stwierdzić, że mają one przyczynowy wpływ na umiejętność czytania1. Jeśli można udowodnić, że normalni czytelnicy i czytelnicy z dysleksją różnią się tylko jedną cechą F1, która jest obecna u dobrych czytelników i nieobecna u słabych czytelników, można stwierdzić, że brak cechy F1 jest przyczyną dysleksji1.

Badania nad przyczynami dysleksji

Badacze próbują znaleźć neurobiologiczne podstawy dysleksji od momentu, gdy schorzenie to zostało po raz pierwszy zidentyfikowane w 1881 roku1. W ciągu ostatnich dziesięcioleci pojawiło się wiele teorii próbujących wyjaśnić przyczyny dysleksji.

Neurolog Orton przeprowadził jedne z najbardziej wpływowych badań nad dysleksją na początku XX wieku i szybko zastąpił termin ślepota słowna terminem strephosymbolia1. W podobnym duchu różni neurolodzy i neuronaukowcy z czasem podkreślali wkład innych regionów mózgu, wskazując na rolę, jaką obszary takie jak układ limbiczny, móżdżek i wzgórze mogą odgrywać w reprezentacji wzrokowej, pamięci i precyzyjnym wyznaczaniu komponentów potrzebnych podczas czytania1.

W latach 90. XX wieku i w późniejszych latach teorie dysleksji stały się ustaloną nauką. Czytanie jest umiejętnością językową, a dysleksja jest spowodowana trudnościami w przetwarzaniu języka, opóźnieniami fonologicznymi i innymi1. W dzisiejszych czasach naukowcy zaczęli szukać źródła tych opóźnień w przetwarzaniu języka, zastanawiając się, czy istnieje genetyczna podstawa dysleksji1.

W ostatniej dekadzie rosnąca liczba badań nad modelami wieloczynnikowymi analizuje efekt znanych czynników predykcyjnych w obecności różnych czynników zewnętrznych1. W tych modelach dysleksja, a zwłaszcza jej nasilenie, jest postrzegana jako wynik kombinacji i/lub interakcji między czynnikami ryzyka, w tym przetwarzaniem fonologicznym, RAN (szybkim automatycznym nazywaniem) i problemami z językiem ustnym, z których wszystkie, podobnie jak dysleksja, mają charakter wymiarowy i manifestują się w różnym stopniu nasilenia1.

Mity i nieporozumienia dotyczące przyczyn dysleksji

Istnieje wiele mitów i nieporozumień dotyczących przyczyn dysleksji, które warto wyjaśnić12.

Dysleksja a odwracanie liter

Powszechne nieporozumienie dotyczy tego, że dysleksja oznacza widzenie liter i słów do tyłu. To przekonanie nie jest potwierdzone przez badania. Odwracanie pisma i odwracanie liter i słów są powszechne we wczesnych etapach rozwoju pisania u większości dzieci. Odwrócenia są nieistotne dla diagnozy dysleksji1.

Dysleksja w swojej najbardziej rozpowszechnionej formie jest bardzo trudnym problemem z czytaniem spowodowanym genetyczną, dziedziczną różnicą w sposobie przetwarzania języka przez mózg1. Osoby z dysleksją nie są intelektualnie upośledzone. Dysleksja nie jest spowodowana niskim ilorazem inteligencji, brakiem motywacji, lenistwem ani złym rodzicielstwem1.

Dysleksja a inteligencja

Dysleksja występuje u osób o wszystkich poziomach inteligencji – przeciętnych, ponadprzeciętnych i wysoce uzdolnionych1. Jest to nieoczekiwana trudność w czytaniu u osoby, która ma inteligencję, aby być znacznie lepszym czytelnikiem1.

Dysleksja nie jest spowodowana brakiem inteligencji12. Nowa definicja dysleksji powinna wyjaśniać utrzymujące się błędne przekonania, które łączą dysleksję z brakiem inteligencji, potencjału do nauki lub talentów1.

Dysleksja jako trudność technologiczna

Istnieje interesująca perspektywa, która postrzega dysleksję jako trudność technologiczną, a nie fizyczną niepełnosprawność12. Według tej koncepcji, przyczyną dysleksji jest zdrowy, funkcjonujący mózg urodzony w dużej mierze w piśmiennym społeczeństwie1.

Podstawową przyczyną dysleksji jest w dużej mierze niepiśmienne społeczeństwo, które stało się w dużej mierze piśmienne w ciągu ostatnich dwustu lat. Nie ma niczego medycznie nieprawidłowego w mózgu osoby z dysleksją1. Technologią jest język pisany, a niepełnosprawnością jest to, że nie każdy mózg jest naturalnie wyposażony, aby łatwo uczyć się tej technologii1.

Dysleksja jako adaptacja ewolucyjna

Istnieje teoria, że dysleksja jest wynikiem ewolucji. Teoretycy popierający tę ideę twierdzą, że czytanie jest nienaturalnym aktem, który nie był wymagany w przeszłości i był używany tylko w niedawnej przeszłości1.

Nowe badania z Uniwersytetu w Cambridge wykazały, że zamiast tego, by dysleksja była oznaką opóźnionego rozwoju, mózgi osób z dysleksją po prostu wymieniły niższe zdolności językowe na adaptacyjność eksploracyjną1. To badanie sugeruje, że zamiast klasyfikować dysleksję jako niepełnosprawność rozwojową, powinno się ją po prostu uważać za oznakę, że uczeń ma specyficzny styl uczenia się1.

Nowe badania wykazały również, że osoby z dysleksją często mają wyższe umiejętności w innych obszarach, co sugeruje, że jest to bardziej adaptacja ewolucyjna niż opóźnienie rozwojowe1.

Znaczenie wczesnej identyfikacji i interwencji

Wczesna identyfikacja dysleksji jest kluczowa, ponieważ badania wykazują wykładnicze korzyści z wczesnej interwencji1. Im dłużej trwa diagnoza dysleksji u dziecka, tym bardziej prawdopodobne, że dziecko będzie doświadczać problemów z czytaniem i uczeniem się. Nieleczona dysleksja może prowadzić do problemów z samooceną i frustracji związanej z własnym wynikiem akademickim. To sprawia, że wczesne wykrywanie jest bardzo ważne1.

Badania wskazują, że 50-90% zagrożonych czytelników może osiągnąć średni poziom wydajności dzięki ukierunkowanym instrukcjom, a interwencje są bardziej skuteczne w klasie zerowej i pierwszej niż później1. Daje to rodzicom, nauczycielom i lekarzom możliwość podkreślenia, że mózgi tych dzieci są okablowane inaczej, ale inny nie oznacza, że są wadliwe1.

Badania pokazują również, że mózg może się zmieniać1. Badacze analizowali skany wykonane przed i po skutecznej nauce czytania u osób z dysleksją1. Gdy te upośledzenia są kompensowane przez nową strategię czytania, umiejętność czytania natychmiast się poprawia1.

Znajomość przyczyn dysleksji umożliwia szczegółową diagnozę problemów z czytaniem i terapię dostosowaną do problemu z czytaniem każdego dziecka, co skutkuje natychmiastową poprawą umiejętności czytania dzieci1. Chociaż dysleksja sama w sobie nie jest niebezpieczna dla zdrowia, to fakt, że osoby z dysleksją nie są identyfikowane, diagnozowane i nie otrzymują potrzebnych usług, stanowi problem1.

Dysleksja nie może być wyleczona – jest całożyciowa1. Jednak z odpowiednimi metodami nauczania, uczniowie z dysleksją mogą uczyć się skutecznie1. Faktem jest, że przyczyna dysleksji jest związana z przetwarzaniem języka, co jest kluczowe, ponieważ duży zbiór badań naukowych wykazał, że umiejętności przetwarzania języka można wzmocnić poprzez ćwiczenia1.

Kategoria przyczyn dysleksji Przykłady Implikacje dla terapii
Genetyczne Geny DCDC2, KIAA0319, DYX1C1; 30-50% szans dziedziczenia od rodzica z dysleksją Wczesna identyfikacja u dzieci z rodzinnym występowaniem dysleksji
Neurobiologiczne Różnice w strukturze i funkcji mózgu; mniejsza aktywacja w lewej półkuli; dysfunkcja obszarów V1, V2, V3 Terapie wykorzystujące neuroplastyczność mózgu; kompensacyjne strategie czytania
Fonologiczne Trudności w identyfikacji i manipulacji dźwiękami mowy; deficyty świadomości fonologicznej Intensywny trening świadomości fonologicznej; metodyka nauczania oparta na nauce o czytaniu
Wzrokowe Problemy z fiksacją wzroku; zbyt duże amplitudy sakad; nieprawidłowa organizacja receptorów światła w oczach Techniki wspomagające kontrolę wzroku podczas czytania; specjalne materiały do czytania
Środowiskowe Ekspozycja na toksyny; infekcje w okresie prenatalnym; przedwczesny poród; brak stymulacji czytania Wczesna interwencja; bogate środowisko językowe; profilaktyka w okresie ciąży
Nabyte Urazy mózgu; udary; demencja; traumy emocjonalne Rehabilitacja neurologiczna; terapia dostosowana do specyfiki uszkodzeń

Aktualny stan wiedzy na temat przyczyn dysleksji

Obecne badania nad dysleksją wskazują na złożoną interakcję czynników genetycznych, neurobiologicznych i środowiskowych jako przyczynę tego zaburzenia12. Dysleksja jest wysoko dziedziczna, a badania genetyczne zidentyfikowały kilka genów, które mogą predysponować do jej rozwoju12.

Badania neuroobrazowe wykazały różnice w strukturze i funkcji mózgu u osób z dysleksją, szczególnie w obszarach związanych z przetwarzaniem języka i czytaniem1. Deficyty w przetwarzaniu fonologicznym są uważane za główną przyczynę trudności w czytaniu, ale inne czynniki, takie jak problemy z pamięcią roboczą, szybkością przetwarzania i umiejętnościami ortograficznymi, również przyczyniają się do obrazu dysleksji1.

Czynniki środowiskowe, takie jak ekspozycja na toksyny, infekcje w okresie prenatalnym czy brak stymulacji językowej, mogą zwiększać ryzyko rozwoju dysleksji u osób predysponowanych genetycznie12.

Dysleksję można również nabyć w wyniku urazu mózgu, udaru lub demencji12. Ten rodzaj dysleksji, nazywany dysleksją nabytą lub pourazową, występuje rzadziej niż dysleksja rozwojowa.

Najnowsze badania sugerują, że dysleksja może być także postrzegana jako adaptacja ewolucyjna, gdzie mózgi osób z dysleksją mogą mieć większe zdolności w innych obszarach, kosztem niższych umiejętności językowych12.

Istotną konkluzją jest to, że dysleksja, choć całożyciowa, może być skutecznie zarządzana poprzez wczesną interwencję i odpowiednie strategie nauczania12. Zrozumienie przyczyn dysleksji umożliwia opracowanie skutecznych terapii dostosowanych do indywidualnych potrzeb osób z tym zaburzeniem.

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  1. 09.04.2026
  2. www.leksykon.com.pl

Materiały źródłowe

  • #1 Dyslexia: What It Is, Causes, Symptoms, Treatment & Types
    https://my.clevelandclinic.org/health/diseases/6005-dyslexia
    Dyslexia is a learning disability that makes reading and language-related tasks harder. It happens because of disruptions in how your brain processes writing so you can understand it. […] The exact cause of dyslexia isn’t clear. However, several clues hint at how and why most cases happen. […] Dyslexia is highly genetic and runs in families. A child with one parent with dyslexia has a 30% to 50% chance of inheriting it. Genetic conditions like Down syndrome can also make dyslexia more likely to happen. […] If you have dyslexia, you’re neurodivergent. That means your brain formed or works differently than expected. Research shows people with dyslexia have differences in brain structure, function and chemistry. […] Infections, toxic exposures and other events can disrupt fetal development and increase the odds of later development of dyslexia.
  • #1 The 3 Leading Causes of Dyslexia – Edublox Online Tutor
    https://www.edubloxtutor.com/what-causes-dyslexia/
    The term dyslexia refers to persons for whom reading is simply beyond their reach. What causes this disorder? This article investigates the three leading causes of dyslexia: genetic influences, cognitive deficits, and brain differences. […] There is a labyrinth of differing, opposing, and often contradictory theories about dyslexia: what it is, its causes, and its possible correction. […] Dyslexia cause no. 1: Genetic influences. A large-scale study of twins with dyslexia yielded a concordance rate of 68% in identical twins, compared to 38% in non-identical twins. […] The prevalence rate for dyslexia in the general English-speaking population is between 5 and 17%. However, the rate of reading-related skill deficits (e.g., word reading, orthographic coding, phonological decoding, and phoneme awareness) based on familial risk studies is between 35 and 40%.
  • #1 Dyslexia – Wikipedia
    https://en.wikipedia.org/wiki/Dyslexia
    The cerebellar theory of dyslexia proposes that impairment of cerebellum-controlled muscle movement affects the formation of words by the tongue and facial muscles, resulting in the fluency problems that some people with dyslexia experience. […] Research into potential genetic causes of dyslexia has its roots in post-autopsy examination of the brains of people with dyslexia. […] Several genes have been associated with dyslexia, including DCDC2 and KIAA0319 on chromosome 6, and DYX1C1 on chromosome 15. […] The contribution of gene-environment interaction to reading disability, which estimates the proportion of variance associated with a person’s environment and the proportion associated with their genes, has been intensely studied using twin studies. […] The orthographic complexity of a language directly affects how difficult it is to learn to read it. […] Dyslexia is not limited to difficulty in converting letters to sounds, and Chinese people with dyslexia may have difficulty converting Chinese characters into their meanings.
  • #1 Dyslexia Causes: Myths, Questions, and Answers
    https://www.everydayhealth.com/dyslexia/causes-myths-questions-answers/
    Dyslexia is a learning disability that affects a persons ability to read. But it has nothing to do with reduced intelligence, lack of motivation, or poor eyesight. […] The structure of brain, along with genetics, probably leads a person to develop dyslexia. […] Dyslexia isn’t caused by low IQ or low income, and it’s not the fault of the person with the disorder. […] Researchers think that dyslexia runs in families, and three large studies on twins have shown that genetics may contribute to reading difficulties. […] In a 2022 study of over 1.5 million adults, scientists have even identified 42 genetic variants strongly associated with dyslexia. […] Researchers have also noticed that those with a family history of dyslexia tend to have difficulty acquiring and using language as infants and toddlers.
  • #1 Possible causes of dyslexia
    https://www.understood.org/en/articles/dyslexia-possible-causes
    Researchers are looking into a number of potential causes of dyslexia. […] Theyve found several genes that are linked to reading and language processing issues. […] There are brain differences between people who have dyslexia and those who dont. […] Dyslexia runs in families. As many as 49 percent of parents of kids with dyslexia also have it. […] Researchers have been looking at specific genes. So far, theyve found several genes that are linked to reading and language processing issues. […] Some are thought to impact brain development. Others are thought to impact how the brain communicates. […] In all of these areas, researchers have seen differences between people who have dyslexia and those who dont. […] For example, the parts of the brain involved in reading dont function the same in people with dyslexia as they do in others.
  • #1 Dyslexia: Causes, Symptoms, Risk Factors, Diagnosis and Treatment
    https://www.prepladder.com/neet-pg-study-material/psychiatry/dyslexia-causes-symptoms-risk-factors-diagnosis-and-treatment
    Dyslexia is a learning condition that makes reading and language-related tasks more difficult. It happens as a result of errors in the way your brain interprets written language. Most people discover they have dyslexia when they are young, and it is often a lifetime problem. This type of dyslexia is often called „developmental dyslexia.” […] It’s unclear what specifically causes dyslexia. However, various hints point to how and why the majority of cases occur. […] Highly inherited, dyslexia runs in families. A child has a 30% to 50% probability of inheriting dyslexia if one parent has the condition. Dyslexia may also be more common in people who have genetic disorders like Down syndrome. […] Having dyslexia makes you neurodivergent. That indicates that your brain is not wired or functions as it should. According to research, people with dyslexia have altered brain chemistry, function, and structure.
  • #1 Dyslexia – Wikipedia
    https://en.wikipedia.org/wiki/Dyslexia
    Dyslexia is believed to be caused by the interaction of genetic and environmental factors. […] Some cases run in families. […] The underlying mechanisms of dyslexia result from differences within the brain’s language processing. […] Researchers have been trying to find the neurobiological basis of dyslexia since the condition was first identified in 1881. […] Neuroimaging techniques, such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET), have shown a correlation between both functional and structural differences in the brains of children with reading difficulties. […] Some people with dyslexia show less activation in parts of the left hemisphere of the brain involved with reading, such as the inferior frontal gyrus, inferior parietal lobule, and the middle and ventral temporal cortex.
  • #1 What Causes Dyslexia? An Overview of 5 Theories – Reading Horizons
    https://readinghorizons.com/blog/what-causes-dyslexia-an-overview-of-5-theories/
    As you may know, dyslexia is a learning disability that causes reading and language difficulties. These difficulties are the result of the way the brain with dyslexia processes graphic symbols (letters) in connection to their sounds (phonemes) in a given language. […] Although many of the signs of dyslexia have been discovered, it still remains unclear what causes dyslexia. However, there are several theories of dyslexia that help explain the origin of this condition. Most researchers believe dyslexia is caused by a combination of these theories, but the exact combination or specific cause is yet to be discovered. […] Some researchers have found clusters of cells in a brain with dyslexia that did not make it to the same location they are found in the brain of those without dyslexia. In most brains, these cells are found primarily in the left side of the brain, the same area used dominantly for reading and language tasks, thus it is believed that these cell misplacements make it difficult for those with dyslexia to process language tasks.
  • #1 What Causes Dyslexia? An Overview of 5 Theories – Reading Horizons
    https://readinghorizons.com/blog/what-causes-dyslexia-an-overview-of-5-theories/
    In connection with the cell misplacement in the first theory, another theory is that dyslexia is caused by unique wiring in the brain. Individuals with dyslexia have been found to have strong activity on the right side of their brain. Because of the strength of their right brain, they engage in this area while performing language tasks. However, as mentioned before, language tasks are typically and most efficiently performed on the left side of the brain. Thus, the wiring of a brain with dyslexia is often prescribed as the cause. […] These differences in brain structure and development are often found to be generational. Not every child of someone with dyslexia has dyslexia, but it is common for someone with dyslexia to have a family history of the condition. […] Another theory is that dyslexia is caused by hearing problems while a child’s brain is still developing and learning language.
  • #1 Dyslexia: German researchers find cause in the brain – DW – 09/15/2024
    https://www.dw.com/en/dyslexia-german-researchers-find-cause-in-the-brain/a-70199780
    Dyslexia occurs in about 5%-10% of people worldwide, making it the most common learning disorder. […] The causes of dyslexia are not yet fully understood. However, researchers based in Dresden, Germany, say they have been able to show, for the first time, that dyslexia is linked to changes in the function and structure of a specific part of the human brain called the visual thalamus. […] The researchers found that people with dyslexia show changes in the function and structure of the movement-sensitive part of the visual thalamus. These changes are particularly evident in male dyslexics. […] Mül ler-Axt said it was crucial that we now know where in the brain dyslexia develops — a „new target directly linked to reading difficulties in dyslexia. And if we target this area and modulate its activity, it could actually help these people in the future.”
  • #1 Dyslexia | Better Health Channel
    https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/dyslexia
    Dyslexia is characterised by difficulties with reading for no apparent reason. […] The exact causes of dyslexia remain unknown, but theories include: There may be problems with phonological awareness (distinguishing the meaning of contrasting speech sounds). […] Reading difficulties tend to run in families, which suggests a genetic link.
  • #1 What is Dyslexia: Causes and Symptoms | Listening
    https://www.listening.com/blog/dyslexia
    Dyslexia is a common learning disability that affects millions of people worldwide. […] Dyslexia is a specific learning disorder that is neurobiological in origin. […] Research suggests that dyslexia has a strong genetic component, meaning it can run in families. The exact cause of dyslexia is not known, but studies have shown that it is related to differences in the way the brain processes language. […] Additionally, studies have shown that people with dyslexia have differences in the way their brains process language compared to those without the condition. Environmental factors, such as exposure to toxins or premature birth, may also play a role in the development of dyslexia.
  • #1 Research in dyslexia – Wikipedia
    https://en.wikipedia.org/wiki/Research_in_dyslexia
    The magnocellular theory attempts to unify the cerebellar theory, the phonological theory, the rapid auditory processing theory, and the visual theory. […] The magnocellular theory proposes that the magnocellular dysfunction is not only restricted to the visual pathways but also includes auditory and tactile modalities. […] The phonological deficit theory proposes that people with dyslexia have a specific sound manipulation impairment, which affects their auditory memory, word recall, and sound association skills when processing speech. […] The rapid auditory processing theory is an alternative to the phonological deficit theory, which specifies that the primary deficit lies in the perception of short or rapidly varying sounds. […] High genetic concordance found in twin studies suggest a significant genetic influence on reading ability, although the degree depends on the definition of dyslexia.
  • #1 Dyslexia: Causes and Concomitant Impairments
    https://pmc.ncbi.nlm.nih.gov/articles/PMC10046374/
    In recent decades, theories have been presented to explain the nature of dyslexia, but the causes of dyslexia remained unclear. […] The present paper proposes the absence of at least one necessary condition or the absence of all sufficient conditions as causes for impaired reading. […] The causes of impaired reading include: an incorrect fixation location, too short a fixation time, the attempt to recognize too many letters simultaneously, too large saccade amplitudes, and too short verbal reaction times. […] It is assumed that a longer required fixation time in dyslexic readers results from a functional impairment of areas V1, V2, and V3 that require more time to complete temporal summation. […] When these impairments are compensated by a new reading strategy, reading ability improves immediately.
  • #1 Dyslexia: Causes and Concomitant Impairments
    https://www.mdpi.com/2076-3425/13/3/472
    Dyslexia: Causes and Concomitant Impairments […] In recent decades, theories have been presented to explain the nature of dyslexia, but the causes of dyslexia remained unclear. […] The present paper proposes the absence of at least one necessary condition or the absence of all sufficient conditions as causes for impaired reading. The causes of impaired reading include: an incorrect fixation location, too short a fixation time, the attempt to recognize too many letters simultaneously, too large saccade amplitudes, and too short verbal reaction times. […] It is assumed that a longer required fixation time in dyslexic readers results from a functional impairment of areas V1, V2, and V3 that require more time to complete temporal summation. […] These areas and areas that receive input from them, such as the fusiform gyrus, are assumed to be impaired in their ability to simultaneously process a string of letters. […] Noncausal correlations between impaired reading performance and other performance impairments must be clearly distinguished from causal relationships. […] A major weakness of theories concerning DD is that research in DD has hitherto ignored the longstanding discussions in the philosophy of science attempting to specify these criteria, presumably because previous mathematically formulated approaches are difficult to transfer to experimental research. […] Therefore, the present study aims to formulate simple experimental criteria for a causal relationship as opposed to correlations without a causal relationship. […] The definition provided here does not use a mathematical approach but offers a description of the notion of causality based on the experimental practice. […] The use of this approach can identify necessary and sufficient conditions in the study of dyslexia. […] To recognize the necessary and sufficient conditions for better reading, reading performance must be tested in the alternating presence and absence of conditions suspected to be necessary or sufficient for reading. […] Poor reading ability can result from many different impairments. […] The problem is to rule out all possible causes of dyslexia other than those being investigated. […] If it can be proven that normal readers and dyslexic readers only differ in one feature F1 which is present in good readers and absent in poor readers, it may be concluded that the absence of feature F1 is the cause of dyslexia. […] Dyslexia can therefore be seen as an impaired ability to individually create all the necessary conditions for error-free reading. […] Dyslexia can have causes other than impairment in finding the correct sequence of sounds for a sequence of letters, other possible causes must be examined independently of a phonological impairment. […] Functional MRI and brain lesion studies have demonstrated that dyslexia results from uncompensated impairments of the primary and secondary visual cortex and areas that receive input from these early visual processing structures, such as the fusiform gyrus, superior temporal gyrus, precuneus, inferior parietal cortex, and left inferior frontal gyrus.
  • #1 Dyslexia: What It Is, Causes, Symptoms, Treatment & Types
    https://my.clevelandclinic.org/health/diseases/6005-dyslexia
    Toxic exposures. Air and water pollution can increase your risk of developing dyslexia. This is especially true with heavy metals (like lead or manganese), nicotine and certain chemicals used as flame retardants. […] The risk of developing dyslexia is higher for children who grow up in households where reading isn’t encouraged or where reading material is less available. […] Children with less learning support in school or similar environments are more likely to develop dyslexia.
  • #1 Dyslexia: Causes, Symptoms, Risk Factors, Diagnosis and Treatment
    https://www.prepladder.com/neet-pg-study-material/psychiatry/dyslexia-causes-symptoms-risk-factors-diagnosis-and-treatment
    Events like infections, chemical exposures, and others can interfere with foetal development and raise the risk that dyslexia will develop later in life. […] Several risk factors can affect a person’s likelihood of developing dyslexia. They consist of, but are not restricted to: […] Your risk of acquiring dyslexia may rise due to air and water pollution. This is especially true for nicotine, certain compounds used as flame retardants, and heavy metals (such lead or manganese). […] Children who grow up in homes where reading isn’t encouraged or where there isn’t as much reading material available are more likely to acquire dyslexia. […] Children who receive less help for their learning in school or other similar settings are more likely to acquire dyslexia.
  • #1 Dyslexia Causes: Myths, Questions, and Answers
    https://www.everydayhealth.com/dyslexia/causes-myths-questions-answers/
    Researchers think that genetically derived differences in the brains of those with dyslexia may contribute to the condition. But there’s no one specific part of the brain that causes the disorder. […] In the brains of those with dyslexia, neurologists have noticed reduced activity and reduced gray matter in these left-hemisphere regions of the brain. […] There are environmental stressors, such as maternal health during pregnancy, that can increase a genetically predisposed persons risk of developing dyslexia. […] The following stressors to fetal or infant health may lead to dyslexia: Premature birth, Low birth weight, Exposure to drugs, alcohol, or nicotine while in the womb, Infections, Infant oxygen deprivation, Maternal high blood pressure. […] Researchers also think that environmental stressors like poor diet or exposure to toxins in water or paint may also contribute to the development of learning disorders.
  • #1 What Causes Dyslexia – Vision, Language or Something Else?
    https://www.gemmlearning.com/blog/dyslexia/the-true-cause-of-dyslexia/
    What Causes Dyslexia – Vision, Language or Something Else? […] Dyslexia is a description of reading skills, best defined by Dr. Sally Shaywitz in Overcoming Dyslexia as “an unexpected difficulty with reading.” […] It follows that the key to helping your child is to figure out what’s causing dyslexia in you or your child. Then you have a clue about what to do next. […] Most researchers describe dyslexia as a language-processing disorder. The most visible early symptoms relate to delays in phonological processing (distinguishing between ‘fan’ and ‘van’) and language manipulation, such as rhyming. […] About 40% of dyslexia is inherited. If your child has signs of dyslexia, and there is dyslexia in your family, then your child is at risk for dyslexia. […] Frequent colds or ear infections in the first 3 years of life can impair hearing, depriving the developing brain of all-important language exercise time.
  • #1 What Are the Different Types of Dyslexia?
    https://neurohealthah.com/blog/types-of-dyslexia/
    If your child struggles with reading, sounding out words, or understanding what they’ve read, they may have a learning disorder called dyslexia. Dyslexia can be developmental (genetic) or acquired (resulting from a traumatic brain injury or disease), and there are several types of Dyslexia including phonological dyslexia, rapid naming dyslexia, double deficit dyslexia, surface dyslexia, and visual dyslexia. […] Dyslexia is a learning disability that hinders an individual’s ability to read by affecting spelling, writing, and comprehension skills. […] Developmental dyslexia refers to dyslexia which is genetic and/or present at birth. […] Secondary dyslexia is the result of problems with brain development during the early stages of pregnancy. […] When a traumatic brain injury or disease affects the brain’s centers responsible for language processing, they can sometimes develop dyslexia. This type of dyslexia is also referred to as trauma dyslexia because it’s caused by trauma to the brain and is the only type of dyslexia with a known cause.
  • #1 Dyslexia Causes, Symptoms, Diagnosis and Treatment – Cura4U
    https://cura4u.com/conditions/dyslexia
    Dyslexia is a disorder that tends to run in genetics. Positive family history of dyslexia can increase the probability of developing this disorder. Dyslexia is thought to occur due to an issue with the part of the brain involved in interpreting language. Dyslexia does not happen due to a vision or hearing problem, although it may be misunderstood as such in the earlier phase. […] Dyslexia can also develop as a result of certain factors. These may include traumatic brain injury, dementia, or stroke. This kind is known as acquired dyslexia. It is far less common compared to hereditary dyslexia. Neither of these causes affects a persons intelligence or ability to think. They are capable of processing normal to complex ideas and perform many regular tasks. The problem is explicitly related when it comes to reading or interpreting language.
  • #1 What Are the Different Types of Dyslexia?
    https://neurohealthah.com/blog/types-of-dyslexia/
    Yes, trauma – both physical and emotional – have been cited in potentially causing the onset of dyslexia. […] Trauma Dyslexia, also commonly referred to as acquired dyslexia, can develop after a person has experienced a traumatic brain injury (TBI), such as a fall from a ladder, a car accident, a sports injury, etc. […] On the other hand, dyslexia may also result from emotional trauma. Although there is little research behind this type of dyslexia, it is cited that early exposure to stressful circumstances such as emotional abuse, neglect, environmental disaster, bullying, witnessing disaster or death, etc. may result in dyslexia and other learning disorders. […] Most people with dyslexia have it from birth; however, it is possible to develop dyslexia later in life. More often than not, this late-onset development is due to a traumatic brain injury – as stated above – such as a stroke or a concussion.
  • #1 Causes of Dyslexia – Building Better Brains
    https://lorrainedriscoll.com/home-2/cellfield-brain-training-for-dyslexia/causes-of-dyslexia/
    As I began learning about integrative approaches to understanding and treating dyslexia, I realized, dyslexia, like many other disorders and illnesses of our time has several causes. […] Researchers who specialize in dyslexia have found that dyslexia can be broken down into different types of dyslexia. […] Two of the common types are visual and auditory and other times these two senses may be malfunctioning together leading to problems decoding and comprehending words. […] Auditory functioning is rarely the first aspect we would think of as a main factor in dyslexia, but indeed it is. […] Auditory dyslexia is not that a person cannot understand phonemes, but that there is a problem in their ability to process sound representations and decode the representations in print. […] Toxicity is everywhere in our modern world and has been found to be responsible for the increased rates of cancer, MS as well as psychiatric and cognitive disorders that are all too prevalent in our ‘developed countries’.
  • #1 Dyslexia: Types, Symptoms and Causes – Unique Community Services
    https://uniquecs.co.uk/blog/dyslexia-types-symptoms-and-causes/
    Both physical and emotional trauma can increase the risk of developing dyslexia. […] Acquired dyslexia happens as a result of traumatic events, including head injuries and illnesses, that cause brain damage and impair its typical functioning. […] The specific effects of acquired dyslexia and the prognosis for recovery depend on the type and severity of brain damage. […] Dyslexia used to be divided into several categories, but updated classifications recognise four main types based on the symptoms and the specific skills affected. […] Phonological dyslexia is the most common type of this learning difficulty, often treated as synonymous with dyslexia itself. […] Rapid naming dyslexia affects ones ability to rapidly pronounce letters and name numbers or colours when presented to them.
  • #1 Dyslexia Basics – International Dyslexia Association
    https://dyslexiaida.org/dyslexia-basics/
    Dyslexia is a language-based learning disability. Dyslexia refers to a cluster of symptoms, which result in people having difficulties with specific language skills, particularly reading. […] The exact causes of dyslexia are still not completely clear, but anatomical and brain imagery studies show differences in the way the brain of a person with dyslexia develops and functions. Moreover, most people with dyslexia have been found to have problems with identifying the separate speech sounds within a word and/or learning how letters represent those sounds, a key factor in their reading difficulties. Dyslexia is not due to either lack of intelligence or desire to learn; with appropriate teaching methods, students with dyslexia can learn successfully. […] In addition, dyslexia runs in families; parents with dyslexia are very likely to have children with dyslexia. For some people, their dyslexia is identified early in their lives, but for others, their dyslexia goes unidentified until they get older.
  • #1 Bright Solutions | What is Dyslexia?
    https://www.dys-add.com/dyslexia.html
    Dyslexia is an inherited condition that makes it extremely difficult to read, write, and spell in your native language despite at least average intelligence. […] Dyslexia is a neurologically-based, often familial, disorder which interferes with the acquisition and processing of language. Varying in degrees of severity, it is manifested by difficulties in receptive and expressive language, including phonological processing, in reading, writing, spelling, handwriting, and sometimes in arithmetic. […] Dyslexia is a specific learning disability that is neurological in origin. […] It is characterized by difficulties with accurate and/or fluent word recognition, and by poor spelling and decoding abilities. […] These difficulties typically result from a deficit in the phonological component of language that is often unexpected in relation to other cognitive abilities and the provision of effective classroom instruction.
  • #1 Dysphonetic Dyslexia in Children: Symptoms, Causes & Solutions
    https://www.readlearningcenter.com/2024/07/02/dysphonetic-dyslexia/
    Dysphonetic dyslexia is a multifaceted condition with a complex web of contributing factors. Research from Yale University has identified a specific gene, DCDC2, linked to dyslexia, indicating that children with a family history may be at higher risk. Additionally, subtle differences in brain structure and function, particularly in regions associated with language processing, may play a role. Early language development and the ability to process sounds (auditory processing) also contribute to developing this unique learning profile.
  • #1 Surface Dyslexia: The Signs, Causes, and Treatment
    https://learninglabfl.com/different-types-of-dyslexia-surface-dyslexia/
    Dyslexia is a learning difference that can make it difficult for your child to learn to read. […] Surface dyslexia (also called visual or dyseidetic dyslexia) is a sub-type characterized by difficulty with whole word recognition and spelling. […] Like most sub-types of dyslexia, there is no clear reason for surface dyslexia. Some studies suggest it may be inherited, but there may be other risk factors. […] Risk factors of dyslexia: A family history of dyslexia or learning disabilities, Premature/low birth weight, Exposure to substances like alcohol, nicotine, or drugs during pregnancy, Prenatal infection that affects brain development, Individual differences in parts of the brain that process language and allow a child to read.
  • #1 Dyslexia: Types, Symptoms and Causes – Unique Community Services
    https://uniquecs.co.uk/blog/dyslexia-types-symptoms-and-causes/
    Double deficit dyslexia is a relatively rare type of dyslexia that combines two different forms of reading difficulty. […] Surface dyslexia makes it hard for the brain to recognise words by sight and process them quickly. […] Visual dyslexia prevents the brain from getting the complete picture of letter shapes and sequences.
  • #1 What Causes Dyslexia – Vision, Language or Something Else?
    https://www.gemmlearning.com/blog/dyslexia/the-true-cause-of-dyslexia/
    Learning English in later life requires a much higher level of language processing skills. Even a slight processing glitch can cause dyslexia. […] While the cause of dyslexia in a child is generally related to language processing delays, this wasn’t always the thinking. […] There are three primary theories of dyslexia and what causes it: visual, language, and cognitive. […] The first case of someone with dyslexia wasn’t reported until 1896 when the British doctor, W. Pringle Morgan, described a 14-year-old boy who couldn’t learn to read. […] Just because there was a genetic part of the dyslexia puzzle, it didn’t mean that the visual theory disappeared. […] Most so-called visual processing difficulties are noticed before reading becomes an issue. […] Dyslexia and vision issues are distinct (i.e., most cases of dyslexia are not caused by vision issues), and each requires specialized treatment.
  • #1 Scientists May Have Found Out What Causes Dyslexia | IFLScience
    https://www.iflscience.com/scientists-found-out-causes-dyslexia-44274
    Dyslexia, a learning difficulty that affects reading, writing, and spelling skills, is more widespread than you probably think. As much as 5-10 percent of the global population has it and despite its commonality, its causes remain poorly understood. […] A remarkable new piece of research has now concluded that strange patterns of light receptors in the eyes may be the primary cause of the condition. […] Writing in the Proceedings of the Royal Society B, a team at the University of Rennes found that the cells responsible for absorbing incoming light within the eyes are arranged differently in people diagnosed with dyslexia. […] Dyslexic people appear to have symmetric arrangements, though, with both eyes containing the exact same layout of cone cells. This leads to identical absorption patterns, which the brain sees as mirror images.
  • #1 Dyslexia: Causes and Concomitant Impairments
    https://pmc.ncbi.nlm.nih.gov/articles/PMC10046374/
    Poor reading ability can result from many different impairments. […] The mere finding that these possible influences are associated with reading difficulties does not allow us to conclude that they have a causal influence on reading performance. […] If it can be proven that normal readers and dyslexic readers only differ in one feature F1 which is present in good readers and absent in poor readers, it may be concluded that the absence of feature F1 is the cause of dyslexia. […] Dyslexia can therefore be seen as an impaired ability to individually create all the necessary conditions for error-free reading. […] Dyslexia results from uncompensated impairments of the primary and secondary visual cortex and areas that receive input from these early visual processing structures, such as the fusiform gyrus, superior temporal gyrus, precuneus, inferior parietal cortex, and left inferior frontal gyrus.
  • #1
    https://link.springer.com/article/10.1007/s11881-023-00297-1
    Neurologist Orton conducted some of the most influential dyslexia research during the early twentieth century and promptly replaced the term word blindness with the term strephosymbolia. […] In a similar vein, various neurologists and neuroscientists over time emphasized the contributions of other brain regions to indicate the role that areas like the limbic system, cerebellum, and thalamus can play in visual representation, memory, and the precise timing of component parts needed during reading. […] Although disruptions in the visual system continued to be the predominant explanations in the first two-thirds of the twentieth century, other sensory systems were implicated in auditory processing disorders. […] The most critical opponents of the latter view emerged from the field of psycholinguistics and would change the history of dyslexia.
  • #1 What Causes Dyslexia – Vision, Language or Something Else?
    https://www.gemmlearning.com/blog/dyslexia/the-true-cause-of-dyslexia/
    In 1957, Alfred Tomatis in France proposed the idea that dyslexia was a problem of the auditory system, not the visual system. […] By 1979, dyslexia research took on a new twist. Vellutino noted that dyslexics have difficulties establishing verbal associations and may not be able to decode words by phonemes. […] It was established that dyslexia was a language processing deficit, not a visual problem. […] In the 1990s and later years, the theories of dyslexia have become settled science. Reading is a language skill, and dyslexia is caused by difficulties processing language, phonological, and other delays. […] These days scientists have started looking for the source of these language processing delays. Is there a genetic basis for dyslexia? […] Dyslexia can be remediated. […] The fact that the cause of dyslexia is language processing related is critical because a large body of scientific research has shown that language processing skills can be strengthened with exercise.
  • #1
    https://link.springer.com/article/10.1007/s11881-023-00297-1
    The cumulative importance of these latter directions has direct implications for any future definition of dyslexia that goes beyond unidimensional views and indeed beyond hypotheses based solely on the English written language system. […] In the last decade, a growing body of research on multifactorial models has been examining the effect of known predictive factors in the presence of different external factors. […] In these models, dyslexia, and especially its severity, is viewed as resulting from a combination of and/or interaction among risk factors, including phonological processing, RAN, and oral language problems, all of which, like dyslexia, are dimensional in nature and manifest in varying degrees of severity. […] It is critical to the societal understanding of dyslexia that, although it is typically described as a specific learning disability, dyslexia is a learning difference that becomes a disability to the extent that environments are disabling.
  • #1 Causes of Dyslexia
    https://www.readingresource.net/causesofdyslexia.html
    Yes, dyslexia is both familial and heritable. There are genetic influences that can cause dyslexia. Specifically, studies have identified certain chromosomes that can be passed down from parents to children. 23-65% of children who are identified with dyslexia also have a parent who was dyslexic. This information provides us with opportunities for early identification and proactive intervention, which is good news. […] No, the cause of dyslexia is not the visual flipping of letters or seeing words backwards. Honestly, this common misperception is frustrating. Too many people believe dyslexia means seeing letters and words backward. This belief is simply not supported by research. The backward writing and reversal of letters and words are common in the early stages for writing development for most children. Reversals are irrelevant to the diagnosis of dyslexia.
  • #1 The Causes of Dyslexia – What the Latest Science Reveals
    https://www.dyslexia-reading-well.com/causes-of-dyslexia.html
    A brain-based problem in decoding of written language […] Genetic and hereditary if you have it there is approximately a 50% chance your child will have it […] Not caused by low intelligence […] Not caused by seeing words backward […] Generally believed to NOT be caused by environmental factors during or after pregnancy […] The latest science reveals that the dyslexic brain processes written words differently. […] In terms of causes of dyslexia, this inefficient pattern of brain activity is right at the top of the list. […] While we don’t know what the ultimate cause of dyslexia is, we do know something about the „intermediate” cause. […] This is known as the phonological processing impairment theory. […] Dyslexia, in its most common form, is a very intractable reading problem caused by a genetic, hereditary difference in the way the brain processes language. […] Recent advances in brain scanning technology have confirmed this neurological signature. […] Perhaps most importantly, we’ve learned that dyslexia is not caused by low intelligence, lack of motivation, laziness or bad parenting.
  • #1 Dyslexia – What are the causes of Dyslexia? – Empowerkidz
    https://empowerkidz.com/what-are-the-causes-of-dyslexia/
    Dyslexia can be caused by a genetic mutation, which is why it commonly runs in families. […] Differences in the areas of the brain that process language cause the disorder. […] There are many other causes of Dyslexia that are complete risk factors which may include: Premature birth or low birth weight, Exposure during pregnancy to nicotine, drugs, alcohol or other infections that may alter brain development in the fetus, Individual differences in the parts of the brain that enable reading, Although it is frequently associated with ADHD, it is a distinct disorder, Not caused by low intelligence. […] Final thoughts on the causes of Dyslexia is that; Dyslexia is an extremely difficult reading impairment caused by a genetic, hereditary difference in the way the brain interprets language in its most prevalent form. Low IQ, a lack of ambition, laziness, or poor parenting are not causes of dyslexia.
  • #1 Dyslexia FAQ – Yale Dyslexia
    http://dyslexia.yale.edu/dyslexia/dyslexia-faq/
    Dyslexia is an unexpected difficulty in reading for an individual who has the intelligence to be a much better reader. […] It is most commonly due to a difficulty in phonological processing (the appreciation of the individual sounds of spoken language), which affects the ability of an individual to speak, read, spell and, often, learn a second language. […] Dyslexia affects 20 percent of the population and represents 8090 percent of all those with learning disabilities. […] Dyslexia occurs at all levels of intelligenceaverage, above average and highly gifted. […] Dyslexia can’t be cured it is lifelong. […] At its core, dyslexia is a problem accessing the sound of spoken language. […] Many young children reverse letters when learning to write, regardless of whether or not they have dyslexia.
  • #1
    https://link.springer.com/article/10.1007/s11881-023-00297-1
    Here we build from the central strength of the existing definition of dyslexia its emphasis on neurobiological origins and proffer a set of seven core principles for a new, more comprehensive conceptualization of dyslexia. […] A new definition of dyslexia, therefore, needs to transcend both past unitary characterizations and past assumptions based largely on the English orthography. […] Of critical importance, any definition of dyslexia should clarify persisting misconceptions that associate dyslexia with a lack of intelligence, potential to learn, or talents. […] The fact that few phenomena have been given more differing names and more causal explanations over the last century than dyslexia has good, important reasons that will emerge later. […] Thus, the first causal explanations begin in the visual system, an explanation that will come in and out of this history and resurface in a more nuanced way most recently by Yeatman.
  • #1 What Causes Dyslexia? We Do! | Psychology Today
    https://www.psychologytoday.com/us/blog/power-dyslexic-thinking/200912/what-causes-dyslexia-we-do
    The cause of dyslexia is a perfectly healthy, functioning brain being born into a largely literate society. […] The root cause of dyslexia is a largely illiterate society becoming largely literate over the last two hundred years. […] There is nothing medically wrong with a dyslexic person’s brain. […] This leads me to believe that dyslexia is a technological disability, not a physical disability. […] The technology is the written language, and the disability is that not every brain is born naturally wired to learn this technology easily. […] So, you see, we, as a society, caused dyslexia. […] What causes dyslexia? In short, we do! […] What causes the pain and suffering that almost always accompanies dyslexia, we do!
  • #1 What Causes Dyslexia? An Overview of 5 Theories – Reading Horizons
    https://readinghorizons.com/blog/what-causes-dyslexia-an-overview-of-5-theories/
    Lastly, there is a theory that dyslexia is a result of evolution. The theorists supporting this idea claim that reading is an unnatural act that was not required in the past, and has only been used in the recent past. […] Although the experts are still not exactly sure what the cause of dyslexia is, there is ever more research that is being conducted and the cause is still being sought after.
  • #1 What Causes Dyslexia? – Lab To Class
    https://labtoclass.com/what-causes-dyslexia/
    Dyslexia is often described as a disability as it can impact a persons ability to read texts quickly and efficiently. […] What causes dyslexia, however, is actually a natural process and people with dyslexia can still learn to become effective readers despite their weakness in the area. […] new research has shown that what causes dyslexia is simple evolutionary variation in our species much like any personality difference. […] What causes dyslexia can therefore differ significantly in different people with the same diagnosis. […] All students have areas they are strong and areas where they are weak. That is the product of evolutionary variation in the brain. […] New research out of Cambridge University has shown that rather than dyslexia being a sign of delayed development, the brains of people with dyslexia simply have traded lower linguistic abilities for exploratory adaptability. […] This study suggests that rather than being classified as a developmental disability, dyslexia should simply be considered a sign of a student having a specific learning style. What causes dyslexia is simply normal evolutionary variation.
  • #1 Reddit – The heart of the internet
    https://www.reddit.com/r/specialeducation/comments/108kjqj/what_causes_dyslexia/
    Dyslexia is a complicated and nuanced condition that has frustrated learning specialists for decades. This is largely because, rather than being a condition with a specific cause, dyslexia describes a set of symptoms that can be caused by a large number of factors. […] New research has even suggested that people with dyslexia often have higher skills in other areas, suggesting that it is more of an evolutionary adaptation rather than a developmental delay. […] Specialists are so important! Let’s help our students with dyslexia find where their brain allocated the extra resources and show them their potential.
  • #1 Understanding Dyslexia | The Southport School
    https://www.southportschool.org/understanding-dyslexia-causes-signs-support-with-dr-ben-powers
    Dyslexia is a brain-based learning difference that impairs a persons reading ability significantly below expected levels based on their overall intelligence. […] Many factors can indicate whether a child is at risk for dyslexia, including: Phonological awareness, Phonological short-term memory, Letter-sound knowledge, Rapid automatized naming, Oral language deficits, Family history. […] Early identification is crucial, as research shows exponential benefits to early intervention. […] Understanding that they are not alone is essential for parents, guardians, and children.
  • #1
    https://www.advocarepedgroup.com/behavior/what-is-dyslexia-in-children-signs-causes-managem
    Dyslexia is a developmental condition that a child is born with. There may be underlying genetic factors at play, as dyslexia has been known to run in families. […] Individuals with dyslexia are not intellectually impaired. Instead, dyslexia affects the way their brain processes information. Diagnostic images of the brain demonstrate that when people with dyslexia read, they use different areas of the brain to process information compared to individuals who do not have dyslexia. This causes inefficiencies in the individuals reading skills, which can make it hard for a child to read and learn. […] The longer it takes to diagnose dyslexia in a child the more likely that child is to experience reading and learning problems. Untreated dyslexia can lead to problems with self-esteem and frustrations with their own academic performance. This makes early detection very important.
  • #1 Dyslexia and the Developing Brain | Harvard Medicine Magazine
    https://magazine.hms.harvard.edu/articles/dyslexia-and-developing-brain
    Proper early identification is key, adds Gaab, because studies indicate that 50 to 90 percent of at-risk readers can reach average levels of performance with targeted instruction, and that interventions are more effective in kindergarten and first grade than later on. […] It gives parents, teachers, and doctors the opportunity to emphasize that these kids brains are wired differently but that different does not mean they are defective.
  • #1 Possible causes of dyslexia
    https://www.understood.org/en/articles/dyslexia-possible-causes
    That can make it hard for kids with dyslexia to learn to read. […] But fMRI studies also show that the brain can change. […] Researchers have looked at scans taken before and after people with dyslexia had effective reading instruction. […] Many kids with dyslexia have other learning and thinking differences as well. […] Its common for kids to have both dyslexia and ADHD, for instance. […] Research suggests that there may be a genetic link between difficulty with reading and difficulty with math. […] The parts of the brain involved in reading work differently in people with dyslexia than they do in others. […] Dyslexia doesnt go away. But with good instruction and practice, kids with dyslexia can improve at reading.
  • #1 Revealing the Causes of Dyslexia through a Differential Diagnosis, a Short-Term Effective Treatment and an Appropriate Conceptual Framework
    https://www.mdpi.com/2075-4418/14/17/1965
    The aim of this present study is to describe the experimental methods applied to identify the causes of dyslexia in detail, to propose a suitable conceptual framework that is different from earlier concepts advocated in the philosophy of science, and to demonstrate the application of these methods and the conceptual framework on reading problems. […] The studies demonstrate that knowledge of the causes of dyslexia enables a detailed diagnosis of reading problems and a therapy tailored to each child’s reading problem, resulting in an immediate improvement in children’s reading performance.
  • #1 Dyslexia and the Developing Brain | Harvard Medicine Magazine
    https://magazine.hms.harvard.edu/articles/dyslexia-and-developing-brain
    By the time Gaab began her own research into dyslexia in 2007, new neuroimaging techniques were available for researchers to examine the brains of children living with dyslexia or those who had a familial risk for the condition that is, a biological parent or sibling with dyslexia. […] An important question remained: Did dyslexia cause these differences, or did these differences cause dyslexia? […] Moreover, the rate of the structures development was slower among those who later developed poor reading skills regardless of familial risk. […] Gaab hopes that pediatricians who often screen for autism and ADHD will adopt dyslexia risk screening, too. […] Dyslexia itself is not hazardous to anyones health. It really is the fact that theyre not being identified, theyre not being diagnosed, and theyre not getting the services that they need.
  • #1
    https://www.bdadyslexia.org.uk/dyslexia/about-dyslexia/what-is-dyslexia
    Dyslexia is a specific learning difficulty which primarily affects reading and writing skills. Dyslexia is actually about information processing. Dyslexic people may have difficulty processing and remembering information they see and hear, which can affect learning and the acquisition of literacy skills. Dyslexia can also impact on other areas such as organisational skills. […] Dyslexia is a set of processing difficulties that affect the acquisition of reading and spelling. In dyslexia, some or all aspects of literacy attainment are weak in relation to age, standard teaching and instruction, and level of other attainments. The nature and developmental trajectory of dyslexia depends on multiple genetic and environmental influences. The most commonly observed cognitive impairment in dyslexia is a difficulty in phonological processing (i.e., in phonological awareness, phonological processing speed or phonological memory). However, phonological difficulties do not fully explain the variability that is observed. Working memory, processing speed and orthographic skills can contribute to the impact of dyslexia. Dyslexia frequently co-occurs with one or more other developmental difficulties, including developmental language disorder, dyscalculia, ADHD, and developmental coordination disorder.
  • #2 Dyslexia: Symptoms, Causes, and Types Explained
    https://lonestarneurology.net/neurological-disorders/dyslexia/
    Dyslexia occurs in people of all intelligence levels and from all walks of life. […] The exact cause of dyslexia is unknown, but it is believed to be caused by a combination of genetic and environmental factors. […] Dyslexia can be caused by various things: Genetic predisposition: If you have a family member with dyslexia, you may be more likely to develop this condition. […] Additionally, some research suggests that dyslexia may be associated with brain structure or function changes. […] Social factors are considered no less vital. For example, excessive teaching loads, pedagogical neglect, a dysfunctional environment, or a lack of communication are aspects that cause dyslexia and exacerbate a person’s condition.
  • #2 Dyslexia: Symptoms, Signs, and Treatment
    https://www.webmd.com/children/understanding-dyslexia-basics
    Dyslexia is considered a reading or learning disability. It happens because of differences in parts of your brain that process words and language. […] We don’t know the exact cause of dyslexia, but there are a few ideas on why and how it happens: Dyslexia is linked to your genes, which is why it often runs in families. You’re 30%-50% more likely to have dyslexia if one of your parents has it. […] Dyslexia can also happen because there were differences in parts of how your brain formed or how it works. Imaging scans in people with dyslexia show that areas of the brain that should be active when a person reads don’t work as expected.
  • #2 What Causes Dyslexia? | Disleksi Vakfı
    https://www.tudiv.org.tr/en/about-5
    Specialist doctors and researchers do not know exactly what causes dyslexia. According to the results of the studies and the evidence obtained, the probability of dyslexia being genetic is quite high. Two important factors are highlighted as the cause of dyslexia. These: […] Genetic Causes: A team at Yale School of Medicine found that defects in a gene known as DCDC2 are associated with problems in reading performance. […] Acquired Dyslexia: A small minority of people with dyslexia have acquired the condition after birth, usually due to a brain injury, stroke, or other type of trauma.
  • #2 What causes dyslexia? Identifying the causes and effective compensatory therapy
    https://pmc.ncbi.nlm.nih.gov/articles/PMC6971836/
    The results of the meta-analysis revealed the following causes for a reading deficiency: an impaired ability to simultaneously recognize a sequence of letters within a word, a prolonged fixation time required to recognize a sequence of letters within a word, saccade amplitudes that exceed the number of letters that the reader is able to recognize simultaneously, and an extended time needed to retrieve the phonemes corresponding to the graphemes from memory.
  • #2 Dyslexia Causes: Myths, Questions, and Answers
    https://www.everydayhealth.com/dyslexia/causes-myths-questions-answers/
    Researchers think that genetically derived differences in the brains of those with dyslexia may contribute to the condition. But there’s no one specific part of the brain that causes the disorder. […] In the brains of those with dyslexia, neurologists have noticed reduced activity and reduced gray matter in these left-hemisphere regions of the brain. […] There are environmental stressors, such as maternal health during pregnancy, that can increase a genetically predisposed persons risk of developing dyslexia. […] The following stressors to fetal or infant health may lead to dyslexia: Premature birth, Low birth weight, Exposure to drugs, alcohol, or nicotine while in the womb, Infections, Infant oxygen deprivation, Maternal high blood pressure. […] Researchers also think that environmental stressors like poor diet or exposure to toxins in water or paint may also contribute to the development of learning disorders.
  • #2 Dyslexia Causes, Symptoms, Diagnosis and Treatment – Cura4U
    https://cura4u.com/conditions/dyslexia
    A family history of dyslexia or other developmental disorders such as attention deficit hyperactivity disorder (ADHD) can increase the risk of its occurrence in the future generation. Some factors regarding pregnancy may also affect the development of the fetuss brain. These may include alcohol intake, drug abuse, smoking, infections, and use of certain medications. Premature or low birth weight babies may also be at risk. In adults, the risk of acquired dyslexia with higher if they suffer from a traumatic brain injury, stroke, or dementia. […] It is difficult to prevent dyslexia as it is a developmental disorder linked with genetics in most cases. Care should be taken during pregnancy to reduce the risk of neurological abnormalities. Avoid smoking, alcohol intake, and drug abuse during pregnancy.
  • #2 Dyslexia: Causes, Symptoms, Risk Factors, Diagnosis and Treatment
    https://www.prepladder.com/neet-pg-study-material/psychiatry/dyslexia-causes-symptoms-risk-factors-diagnosis-and-treatment
    Events like infections, chemical exposures, and others can interfere with foetal development and raise the risk that dyslexia will develop later in life. […] Several risk factors can affect a person’s likelihood of developing dyslexia. They consist of, but are not restricted to: […] Your risk of acquiring dyslexia may rise due to air and water pollution. This is especially true for nicotine, certain compounds used as flame retardants, and heavy metals (such lead or manganese). […] Children who grow up in homes where reading isn’t encouraged or where there isn’t as much reading material available are more likely to acquire dyslexia. […] Children who receive less help for their learning in school or other similar settings are more likely to acquire dyslexia.
  • #2 Dyslexia Causes: Myths, Questions, and Answers
    https://www.everydayhealth.com/dyslexia/causes-myths-questions-answers/
    Acquired dyslexia occurs in individuals who have suffered migraines, or injuries to the brain through strokes or other trauma. […] While scientists do not think that developmental dyslexia causes neurological disorders like Alzheimer’s disease, they have noticed an association between learning disabilities like dyslexia and symptoms of atypical dementia.
  • #2 Revealing the Causes of Dyslexia through a Differential Diagnosis, a Short-Term Effective Treatment and an Appropriate Conceptual Framework
    https://www.mdpi.com/2075-4418/14/17/1965
    Various different impairments and their interactions can cause reading problems referred to as “dyslexia”. […] The diagnosis must differentiate various kinds of dyslexia. […] The diagnosis of a certain kind of dyslexia cannot be delimited to the investigation and description of symptoms but must also include the investigation of the causes of each kind of dyslexia. […] The methods suitable for revealing the causes of dyslexia are described in detail, and the results of applying these methods in experiments, in which 356 children with developmental dyslexia participated, are reviewed. […] The different types of dyslexia can only be differentiated from one another if the diagnosis relates to their different causes. […] Therefore, revealing the different causes of reading impairments constitutes an essential element of the diagnosis.
  • #2 The Causes of Dyslexia – What the Latest Science Reveals
    https://www.dyslexia-reading-well.com/causes-of-dyslexia.html
    A brain-based problem in decoding of written language […] Genetic and hereditary if you have it there is approximately a 50% chance your child will have it […] Not caused by low intelligence […] Not caused by seeing words backward […] Generally believed to NOT be caused by environmental factors during or after pregnancy […] The latest science reveals that the dyslexic brain processes written words differently. […] In terms of causes of dyslexia, this inefficient pattern of brain activity is right at the top of the list. […] While we don’t know what the ultimate cause of dyslexia is, we do know something about the „intermediate” cause. […] This is known as the phonological processing impairment theory. […] Dyslexia, in its most common form, is a very intractable reading problem caused by a genetic, hereditary difference in the way the brain processes language. […] Recent advances in brain scanning technology have confirmed this neurological signature. […] Perhaps most importantly, we’ve learned that dyslexia is not caused by low intelligence, lack of motivation, laziness or bad parenting.
  • #2 Dyslexia Causes: Myths, Questions, and Answers
    https://www.everydayhealth.com/dyslexia/causes-myths-questions-answers/
    Dyslexia is a learning disability that affects a persons ability to read. But it has nothing to do with reduced intelligence, lack of motivation, or poor eyesight. […] The structure of brain, along with genetics, probably leads a person to develop dyslexia. […] Dyslexia isn’t caused by low IQ or low income, and it’s not the fault of the person with the disorder. […] Researchers think that dyslexia runs in families, and three large studies on twins have shown that genetics may contribute to reading difficulties. […] In a 2022 study of over 1.5 million adults, scientists have even identified 42 genetic variants strongly associated with dyslexia. […] Researchers have also noticed that those with a family history of dyslexia tend to have difficulty acquiring and using language as infants and toddlers.
  • #2 What Causes Dyslexia? – ResearchILD
    https://researchild.org/what-causes-dyslexia/
    What causes dyslexia? Society does. […] The cause of dyslexia is a perfectly healthy, functioning brain being born into a largely literate society. […] There is nothing medically wrong with a dyslexic person’s brain. […] This leads me to believe that dyslexia is a technological disability, not a physical disability. […] The technology is the written language, and the disability is that not every brain is born naturally wired to learn this technology easily. […] If we want our students to truly understand that the struggle of having dyslexia is not their ‘fault,’ then we have to explain to them the social causes of dyslexia.
  • #2 Reddit – The heart of the internet
    https://www.reddit.com/r/specialeducation/comments/108kjqj/what_causes_dyslexia/
    Dyslexia is a complicated and nuanced condition that has frustrated learning specialists for decades. This is largely because, rather than being a condition with a specific cause, dyslexia describes a set of symptoms that can be caused by a large number of factors. […] New research has even suggested that people with dyslexia often have higher skills in other areas, suggesting that it is more of an evolutionary adaptation rather than a developmental delay. […] Specialists are so important! Let’s help our students with dyslexia find where their brain allocated the extra resources and show them their potential.
  • #2 Dyslexia and the Developing Brain | Harvard Medicine Magazine
    https://magazine.hms.harvard.edu/articles/dyslexia-and-developing-brain
    Proper early identification is key, adds Gaab, because studies indicate that 50 to 90 percent of at-risk readers can reach average levels of performance with targeted instruction, and that interventions are more effective in kindergarten and first grade than later on. […] It gives parents, teachers, and doctors the opportunity to emphasize that these kids brains are wired differently but that different does not mean they are defective.