Abstract
An experiment was performed to (a) test the psychological refractory period (PRP) hypothesis of the human S as a 1-channel data processing system with an event uncertain-time certain stimulus series, and (b) determine the combined effect of time and event uncertainty. To test the PRP hypothesis, 5 groups of 12 Ss had 5 different time intervals between visual and audtio stimuli (0, 100, 200, 400, and 800 msec). The visual S-R sequence produced a delay in audio responses that was significant at 0-, 100-, and 200-msec. intervals. The human apparently responds as a 1-channel system when he processes event uncertain-time certain data. Another group of 12 Ss had the 5 inter-stimulus intervals with both time and event uncertainty. Their bisensory audio impairment was similar to the 5 time certain groups.

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