We are grateful to Remy Pernaud and Dany Palleresompoulle for their technical contribution. We also thank Karen Davranche for helpful discussions and to Hartmut Leuthold and an anonymous reviewer for valuable comments on a preliminary version of this paper. The first author was supported by a grant of the Ministry of Education and Research.
Neural inhibition and interhemispheric connections in two-choice reaction time: A Laplacian ERP study
Article first published online: 9 APR 2009
Copyright © 2009 Society for Psychophysiological Research
Volume 46, Issue 4, pages 726–730, July 2009
How to Cite
Meynier, C., Burle, B., Possamaï, C.-A., Vidal, F. and Hasbroucq, T. (2009), Neural inhibition and interhemispheric connections in two-choice reaction time: A Laplacian ERP study. Psychophysiology, 46: 726–730. doi: 10.1111/j.1469-8986.2009.00818.x
- Issue published online: 9 JUN 2009
- Article first published online: 9 APR 2009
- (Received July 17, 2008; Accepted October 7, 2008)
- Decision making;
- Corpus callosum;
- Motor cortex;
- Neural nets
In between-hand choice reaction time tasks, the motor cortex involved in the required response is activated while the motor cortex involved in the non-required response is inhibited. Such an inhibition could be implemented actively between the responses defined as possible alternatives by the task instructions or, alternatively, could passively result from some kind of “reciprocal inhibition” between the two motor cortices. The present study addressed this issue. To this end, we compared the surface Laplacian transforms of electroencephalographic (EEG) waves recorded over the contralateral and ipsilateral motor cortices in between-hand and within-hand choice conditions. The dynamics of the recorded EEG activities suggest that inhibition is implemented in a feed-forward manner between the cortical zones controlling the different response alternatives rather than between homologous motor cortical structures.