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Selecting the adequate alternative in choice situations may involve an inhibition process. Here we assessed response implementation during the reaction time of a between-hand choice task with single- or paired-pulse (3 or 15 ms interstimulus intervals [ISIs]) transcranial magnetic stimulation of the motor cortex. The amplitude of the single-pulse motor evoked potential (MEP) initially increased for both hands. At around 130 ms, the single-pulse MEP kept increasing for the responding hand and decreased for the nonresponding hand. The paired-pulse MEP revealed a similar pattern for both ISIs with no effect on short intracortical inhibition and intracortical facilitation measures. The results suggest that the incorrect response implementation was selectively suppressed before execution of the correct response, preventing errors in choice context. The results favor models assuming that decision making involves an inhibition process.

Item Type:	Refereed Article
Keywords:	Action selection;Human;Motor control;RT;Two-alternative forced choice
Research Division:	Psychology
Research Group:	Cognitive and computational psychology
Research Field:	Sensory processes, perception and performance
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in psychology
UTAS Author:	Tandonnet, C (Dr Christophe Tandonnet)
UTAS Author:	Garry, MI (Associate Professor Michael Garry)
UTAS Author:	Summers, JJ (Professor Jeffery Summers)
ID Code:	68110
Year Published:	2011
Web of Science® Times Cited:	33
Deposited By:	Psychology
Deposited On:	2011-03-09
Last Modified:	2014-12-18
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