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In a visual RT experiment, 5 male Ss were each confronted with 2lights and instructed to respond to 1 light but not respond whenboth lights occurred. The onset of the 2 lights was made asynchronousby 0, 12, 33, or 63 msec. Probability of inhibiting the responsedeclined markedly for each delay and increased with RT. It was con-cluded that choice RT is correlated with the extent of the stimulusinformation processing and the duration of effective stimulation whichhas preceded initiation of the motor event.
Lappin et al. (Thu,) studied this question.