Abstract
The role of digit span and practice on the dichotic listening performance (DLP) of mentally retarded children was assessed in two experiments. In Exp. I, the DLP of two groups of 10 Ss was compared in a 2 × 5 × 2 × 3 factorial design—Groups (high digit span, 6; low digit span, 4) × Series length (1, 2, 3, 4, 5 digits/ear) × Half span (1st, 2nd) × Practice (Day 1, 2, 3). Digit span had a significant effect on DLP while practice did not. Experiment II attempted to replicate some of the effects of Exp. I and evaluate the role of maturational level in DLP with digit span held constant. The DLP of two groups of 10 Ss with like mean digit spans (4.3 and 4.5) but different MAs (10-0 and 6-3) was compared using the factorial design of Exp. I. The results of Exp. I were replicated and no significant effect of MA was found.
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