In an experiment testing RT to visual, auditory, and paired visual and auditory stimuli, 28 normal Ss showed more rapid responses to paired stimulation than to stimulation in either modality alone. A group of 30 children with communication disorders at a school for the deaf failed to respond more rapidly to paired stimulation. Positive reinforcement improved RT in both groups. In a second experiment, threshold of response to white noise was approximated by an RT technique with control and selected clinical Ss.
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