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. 2008 May;40(2):479-83.
doi: 10.3758/brm.40.2.479.

STOP-IT: Windows Executable Software for the Stop-Signal Paradigm


STOP-IT: Windows Executable Software for the Stop-Signal Paradigm

Frederick Verbruggen et al. Behav Res Methods. .


The stop-signal paradigm is a useful tool for the investigation of response inhibition. In this paradigm, subjects are instructed to respond as fast as possible to a stimulus unless a stop signal is presented after a variable delay. However, programming the stop-signal task is typically considered to be difficult. To overcome this issue, we present software called STOP-IT, for running the stop-signal task, as well as an additional analyzing program called ANALYZE-IT. The main advantage of both programs is that they are a precompiled executable, and for basic use there is no need for additional programming. STOP-IT and ANALYZE-IT are completely based on free software, are distributed under the GNU General Public License, and are available at the personal Web sites of the first two authors or at

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