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7 - Modeling Response Inhibition in the Stop-Signal Task

Published online by Cambridge University Press:  20 April 2023

F. Gregory Ashby
Affiliation:
University of California, Santa Barbara
Hans Colonius
Affiliation:
Carl V. Ossietzky Universität Oldenburg, Germany
Ehtibar N. Dzhafarov
Affiliation:
Purdue University, Indiana
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Summary

Response inhibition refers to an organism’s ability to suppress unwanted impulses, or actions and responses that are no longer required or have become inappropriate.In the stop-signal task, participants perform a response time task (go task), and occasionally, the go stimulus is followed by a stop signal after a variable delay, indicating subjects to withhold their response (stop task). The main interest of modeling is in estimating the unobservable latency of the stopping process as a characterization of the response inhibition mechanism. Here we analyze and compare the underlying assumptions of different models, including parametric and non-parametric versions of the race model. New model classes based on the concept of copulas are introduced and a number of unsolved problems facing all existing models are pointed out.

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Publisher: Cambridge University Press
Print publication year: 2023

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