The speed of performing a simple ballistic movement under two conditions of response-initiation, stimulus-cued and self-cued, was studied with 24 educable retardates. Also, the effects of stimulus intensity (50 and 70 db re threshold) and sex were examined using a 2 × 2 × 2 factorial design. All main effects, but no interactions, were significant. The slower ballistic speed observed under the self-cued condition was attributed to a deficient capacity for self-arousal.
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