Abstract
Developmental asphasic and control children were tested for the ability to perceive binary sequences of non-verbal stimuli in the auditory and visual modalities. Performance was studied in relation to duration of stimulus elements, interval between elements and number of elements in a sequence. No significant differences between groups were observed on visual tests. On auditory tests aphasics, but not controls, were adversely affected by decreases in duration of stimulus elements and interval between elements, and by increases in number of elements. Total duration of stimulus patterns proved critical to aphasics' performance. It is suggested that developmental aphasics are incapable of perceiving auditory information at a normal rate, and the possibility is considered that this constraint on the speed of auditory processing may underlie their language impairment.
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