The Types of Dyslexia
Dyslexia is a neurological condition that causes difficulties in learning. The condition most often affects reading, writing, and spelling, causing difficulties with word recognition and decoding abilities. These difficulties can lead to reading comprehension problems, which can delay vocabulary skills and general knowledge that comes from positive reading experiences. Dyslexia can additionally affect mathematical abilities.
Three main types of dyslexia are dyseidetic dyslexia, dysphonetic dyslexia, and dysphoneidetic dyslexia. Dyseidetic dyslexia is associated with the functioning in the brain in the angular gyrus of the left parietal lobe. A student with dyseidetic dyslexia has poor sight-word recognition abilities and has problems remembering whole irregular, or eidetic, words. Since dyseidetic dyslexics phonetically sound out, or decode, and phonetically spell, or encode, these students often read better than they spell. Dysphonetic Dyslexia is associated with the functioning of Wernicke’s Area of the left temporal lobe. A student with this type of dyslexia is unable to sound out phonetically regular, or phonetic, words. Students with dysphonetic dyslexia learn words through memorization, and unknown words are often substituted or skipped while reading.
Dysphoneidetic Dyslexia is a combination of deficits in functioning in the angular gyrus and Wernicke’s Area. A student with this type of dyslexia often has weak visual-motor skills. Dysphoneidetic dyslexia is the severest form of the condition and often the most difficult to treat.