Redundancy gain in the stop-signal paradigm: Implications for the locus ofcoactivation in simple reaction time

The authors carried out 2 experiments designed to cast light on the locus o f redundancy gain in simple visual reaction time by using a stop-signal par adigm. In Experiment 1, the authors found that single visual stimuli were m ore easily inhibited than double visual stimuli by an acoustic stop signal. This result is in keeping with the idea that redundancy gain occurs prior to the ballistic stage of the stop-signal task. In Experiment 2, the author s found that the response to an acoustic go signal was more easily inhibite d by a double than by a single visual stop signal. This result provides con clusive evidence for a redundancy gain in the stop process-in a process tha t does not involve a motor response but rather its inhibition.