Learning disability subtypes: classification of high functioning hyperlexia.

This study examined 30 children with hyperlexic reading patterns and average intelligence to determine if established learning disability subtypes could be applied to these children with hyperlexia. Two groups emerged. One type showed language learning disorder patterns with good visual memory. This group also showed a high percentage of phonetic word errors. A second hyperlexic group showed signs of nonverbal learning disorder with visual spatial deficits and impaired visual memory. This latter subgroup showed few phonetic errors with more sight word errors. These findings suggest subtypes of high functioning hyperlexia, one showing language deficits characteristic of dysphasia and one showing patterns similar to visual spatial dyslexia.