Short-Term Memory and Visual Discrimination in Retarded Readers

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Abstract
A visual discrimination task was administered to groups of 21 retarded readers and 21 normal readers equated for CA and IQ. Ss were required to judge whether pairs of geometric shapes were the same or different. The task was administered under 3 conditions, each involving a longer delay between presentation of the first and second stimulus of each pair. Retarded readers made significantly more errors than normal readers under all conditions. Errors of equivalence characterized the retarded readers, while errors of non-equivalence occurred equally in both groups and were related to length of delay.