Use of a delayed signal to stop a visual reaction-time response.

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.