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Acta Psychol (Amst). 2003 Feb;112(2):105-42.

Horse-race model simulations of the stop-signal procedure.

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Department of Psychology, Faculty of Psychology, Leiden University, PO Box 9555, 2300 RB Leiden, The Netherlands.


In the stop-signal paradigm, subjects perform a standard two-choice reaction task in which, occasionally and unpredictably, a stop-signal is presented requiring the inhibition of the response to the choice signal. The stop-signal paradigm has been successfully applied to assess the ability to inhibit under a wide range of experimental conditions and in various populations. The current study presents a set of evidence-based guidelines for using the stop-signal paradigm. The evidence was derived from a series of simulations aimed at (a) examining the effects of experimental design features on inhibition indices, and (b) testing the assumptions of the horse-race model that underlies the stop-signal paradigm. The simulations indicate that, under most conditions, the latency, but not variability, of response inhibition can be reliably estimated.

[Indexed for MEDLINE]

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