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Actual and mental motor preparation and execution: a spatiotemporal ERP study

Caldara, Roberto ; Deiber, Marie-Pierre ; Andrey, Carine ; Michel, Christoph ; Thut, Gregor ; Hauert, Claude-Alain

In: Experimental Brain Research, 2004, vol. 159, no. 3, p. 389-399

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    Titre
    • Actual and mental motor preparation and execution: a spatiotemporal ERP study
    Auteur
    • Caldara, Roberto. Faculty of Psychology and Educational Sciences, University of Geneva, Geneva, Switzerland
    • Deiber, Marie-Pierre. Faculty of Psychology and Educational Sciences, University of Geneva, Geneva, Switzerland
    • Andrey, Carine. Faculty of Psychology and Educational Sciences, University of Geneva, Geneva, Switzerland
    • Michel, Christoph. Functional Brain Mapping, Department of Neurology, University Hospital of Geneva, Geneva, Switzerland
    • Thut, Gregor. Functional Brain Mapping, Department of Neurology, University Hospital of Geneva, Geneva, Switzerland
    • Hauert, Claude-Alain. Faculty of Psychology and Educational Sciences, University of Geneva, Geneva, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Experimental Brain Research, 2004, vol. 159, no. 3, p. 389-399. Springer-Verlag; http://www.springer.de
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:312425
    Summary
    Studies evaluating the role of the executive motor system in motor imagery came to a general agreement in favour of the activation of the primary motor area (M1) during imagery, although in reduced proportion as compared to motor execution. It is still unclear whether this difference occurs within the preparation period or the execution period of the movement, or both. In the present study, EEG was used to investigate separately the preparation and the execution periods of overt and covert movements in adults. We designed a paradigm that randomly mixed actual and kinaesthetic imagined trials of an externally paced sequence of finger key presses. Sixty channel event-related potentials were recorded to capture the cerebral activations underlying the preparation for motor execution and motor imagery, as well as cerebral activations implied in motor execution and motor imagery. Classical waveform analysis was combined with data-driven spatiotemporal segmentation analysis. In addition, a LAURA source localization algorithm was applied to functionally define brain related motor areas. Our results showed first that the difference between actual and mental motor acts takes place at the late stage of the preparation period and consists of a quantitative modulation of the activity of common structures in M1. Second, they showed that primary motor structures are involved to the same extent in the actual or imagined execution of a motor act. These findings reinforce and refine the functional equivalence hypothesis between actual and imagined motor acts