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Supervision de l'action et optimisation des comportements : Etudes électrophysiologiques et IRMf

Abstract : We studied the cerebral mechanisms involved in the optimisation of performance. In order to increase the knowledge of these mechanisms, we ran EEG and fMRI experiments in reaction time task in which we manipulated the stimulus-response compatibility. Firstly, we investigated the role of the negativity of error (Ne), an EEG component which has been discovered in errors and which reaches its maximum just after the response. The Ne was first interpreted as reflecting the error detection. We suggest that the Ne, localised in the rostral cingulate zone, is involved in the evaluation of the performance in order to correct erroneous responses. Secondly, we were interested in mechanisms involved in response selection. The N-40, recorded over the supplementary motor area, is proposed to play a role in the response selection stage. Error prevention would take place at the primary motor cortices level by an enhancement of the response threshold when necessary. Thirdly, we showed, in a fMRI study, that the behavioural adjustment after an incompatible trial is due to an increase of the processing of relevant feature of the stimulus and an decrease of the irrelevant one. In this work, we clarified the role of the Ne and the processes which are responsible for the behavioural adjustments. These results suggest the existence of mechanism able to detect on-line the error risk involved in preventing errors.
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Contributor : Clémence Roger <>
Submitted on : Monday, January 18, 2010 - 11:20:40 AM
Last modification on : Tuesday, October 20, 2020 - 3:10:34 AM
Long-term archiving on: : Thursday, June 17, 2010 - 10:54:44 PM


  • HAL Id : tel-00448018, version 1



Clémence Roger. Supervision de l'action et optimisation des comportements : Etudes électrophysiologiques et IRMf. Neurosciences [q-bio.NC]. Université de Provence - Aix-Marseille I, 2009. Français. ⟨tel-00448018⟩



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