Children with severe dyslexia were slower in counting from memory and naming alternating digits and letters than those with milder reading impairment. The children most disabled also had poorer phonological sensitivity, shorter digit spans, and lower Verbal IQs, but these variables accounted for no additional variance in prediction of scores on the Wide Range Achievement Test-Revised (R = 0.89).
Children with attention deficit disorder (ADD) and dyslexia (n = 82) made significantly more errors than normally reading children with ADD (n = 83) on a simple auditory test of phonological sensitivity to rhyme and alliteration (Bradley, 1984). A subgroup of children with dyslexia who were sensitive to rhyme and alliteration had higher scores on the Wechsler Intelligence Scale for Children-Revised (WISC-R) Spatial factor than a dyslexic subgroup who were phonologically insensitive. In multiple regression analyses, age-corrected phonological sensitivity scores contributed significantly to the prediction of both reading and spelling Wide Range Achievement Test (WRAT) scores, this beyond the contribution of WISC-R variables. Of interest for dyslexia subtyping theories, Spatial factor scores had a subtractive effect in these regression analyses.
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