Abstract
The effects of time pressure (TP) on stimulus evaluation and reaction preparation processes were investigated using P300 and the lateralized readiness potential (LRP). Event-related potentials (ERPs) of participants performing visual and auditory discrimination tasks were recorded. TP was manipulated by using moderate or severe response time limits. TP effects on the P300 and LRP latency were compared between two levels of discriminability, which was manipulated by stimulus intensity. Results indicated that P300 latency was reduced by severe TP only when discrimination was difficult. LRP latency was affected by TP regardless of stimulus intensity. These results suggest that the durations of both stimulus evaluation process and reaction preparation process were reduced by TP. ( Japanese Journal of Physiological Psychology and Psychophysiology, 23 (3) : 227-236, 2005.)
