Do children who go on to develop dyslexia show normal verbal and nonverbal development before reading onset? According to the aptitude-achievement discrepancy model, dyslexia is defined as a discrepancy between intelligence and reading achievement. One of the underlying assumptions is that the general cognitive development of children who fail to…

The study of 813 learning disabled children (ages 6-11) with test-retest data (after three years) on 224 children found the children to suffer a progressive deterioration in verbal ability whereas their nonverbal ability showed an increase in the earlier years, leveling off thereafter. (Author/DB)

A study compared developmental functioning, social, and environmental backgrounds of 62 overly active children (age 7), 37 with inattentive behavior, and 46 controls. Children with inattentive behavior were more likely to have general cognitive delays, particularly in language development and were more likely to have fathers with low occupational…