Frontocentral P3 As a Pure Index of Stop Processing: Electrophysiological Evidence from a Fundamentally Novel Stop-Signal Task

Response inhibition is typically studied with infrequent stop-signals, confounding stopping with stop-signal frequency. Subjects completed a standard stop-signal task and one in which they raced a stop-signal given every trial. Frontocentral P3 distinguished successful from failed stops even when stop-signals were common, demonstrating P3 a valid physiological index of inhibition.