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The effect of timing interval and stimulus difficulty on inhibitory control Lindsey Thomas School of Psychology University of Nottingham Course: C82 MHC Abstract This experiment ran 20 participants in a within subjects design on the stop signal task. The independent variables were stop signal delay and the task difficulty (easy=single letters, difficult=five letter words). The experimental hypotheses were increasing stop signal delay will decrease the ability to withhold responses, increasing the stimulus difficulty will increase the ability to withhold responses and increasing stimulus difficulty and increasing stop signal delay will together affect the ability to withhold responses. The results show that there is a decrease in mean accuracy on both easy and difficult stimuli from 250ms to 550ms and that mean accuracy was generally lower on the easy stimuli. However the inferential statistics found that the difference in stop signal delay was the only significant finding. Introduction Inhibitory control is crucial to control actions...

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