A transcranial magnetic stimulation study of information processing in the motor cortex: relationship between the silent period and the reaction time delay.

Full Abstract

The present study was aimed at deciphering whether the delay in choice reaction time (RT) and the silent period (SP) caused by transcranial magnetic stimulation (TMS) of the motor cortex in the ongoing electromyogram are due to the same physiological mechanism. To this end, the effect of TMS was studied in 6 healthy volunteers performing a between-hand choice RT task. Specific predictions were derived from a logic inspired from the "postponed stages" hypothesis (Pashler & Johnson, 1989). This logic predicts a correlation between SP duration and RT when the stimulated cortex is involved in the response, and a stronger correlation when the stimulation is delivered later during the RT interval. The effect of TMS on RT was twofold:
At early stimulation times, the stimulation shortened the RT and this effect was independent of the involvement of the stimulated motor cortex in the subsequent response. At later stimulation times, TMS had a disruptive effect, provided that the stimulated cortex was involved in the response. When the stimulated cortex was involved in the response, there was a correlation between SP and RT; this correlation was stronger when the stimulation occurred later. In contrast, there was no correlation between these two variables when the stimulated cortex was not involved.

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Author information

Author/s: Burle, Boris (B); Bonnet, Michel (M); Vidal, Franck (F); Possamaï, Camille-Aime (CA); Hasbroucq, Thierry (T);

Affiliation: Centre de Recherche en Neurosciences Cognitives, Centre National de la Recherche Scientifique, Marseille, France.

Journal and publication information

Publication Type: Clinical Trial; Journal Article

Journal: Psychophysiology (Psychophysiology), published in United States. (Language: eng)

Reference: 2002-Mar; vol 39 (issue 2) : pp 207-17

Dates: Created 2002/09/05; Completed 2002/10/01; Revised 2004/11/17;

PMID: 12212670, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Brain - radiation effects
Electromagnetic Fields
Evoked Potentials, Motor - physiology
Humans

Male
Mental Processes - physiology
Middle Aged
Motor Cortex - physiology
Reaction Time - physiology

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