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Short-term visual information processing in dyslexics.

STANLEY, GORDON, and HALL, RODNEY. Short-Term Visual Information Processing in Dyslexics. CHILD DEVELOPMENT, 1973, 44, 841-844. 2 measures of visual information processing were compared for dyslexic and control samples of children. With the first measure 2 parts of a stimulus were exposed sequentially for 20 msec each at increasing interstimulus intervals (ISIs). Both separation and identification thresholds were longer for dyslexics than normals. With the second measure letters presented for 20 msec were masked by dots, the interstimulus interval between the letter and masker being incremented over trials. Dyslexics required longer ISIs than controls for correct identification of the letter. This difference was greater when the letters were visually confusable. Both experiments provide evidence that significant differences exist between dyslexics and normals at early stages of visual information processing.