Dyslexia Institutes of America
Producing Results for Lifelong Success

Types of Dyslexia

There are three main types of dyslexia; each has its own symptoms and causes:

Dyseidetic Dyslexia

A type of dyslexia associated with differential brain functions located in the Angular Gyrusof the left pariental lobe of the brain. A person suffering from this type of dyslexia will have poor sight-word recognition, contributing to an overall slow and laborious reading experience. Irregular words are both sounded out phonetically (laugh = log) and spelled phonetically (ready = rede). Dyseidetic Dyslexics often are, as a result of their condition, more advanced in reading than in spelling.

Dysphonetic Dyslexia

A type of dyslexia associated with differential brain functions located in the Wernicke's Areaof the left temporal and parietal lobes of the brain. A person suffering from this type of dyslexia relies on sight recognition to read, being unable to sound out unknown words. During reading, words are either known or not known, and are often substituted or skipped when trouble arises. Words are learned by rote memorization, and cannot be spelled by their sound. Ear infections can cause some problems.

Dysphoneidetic Dyslexia

A type of dyslexia associated with a combination of differential brain functions in the Angular Gyrus and the Wernicke's Area. A person suffering from this type of dyslexia will have weak visual-motor skills, and is often the most difficult to treat.

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