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Neurophysiological correlates of mental imagery in different sensory modalities

Identifieur interne : 000872 ( PascalFrancis/Checkpoint ); précédent : 000871; suivant : 000873

Neurophysiological correlates of mental imagery in different sensory modalities

Auteurs : A. J. Fallgatter [Allemagne] ; T. J. Mueller [Allemagne] ; W. K. Strik [Allemagne]

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RBID : Pascal:97-0240557

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Abstract

Copyright (c) 1996 Elsevier Science B.V. All rights reserved. Mental Imagery is supposed to be a basic phenomenon of conscious mental opera tions, which is exerted in any sensory modality. The aim of the present study wa s to investigate neurophysiological correlates of mental imagery in the visual, the acoustic and tactile modality. For that purpose, word lists were created bas ed on their power to evoke mental imagery in these modalities. Nine young health y volunteers were included. Words were presented on a computer screen with 3-s i ntervals. Evoked electrical activity was recorded simultaneously with a 21-chann el system. After inspection for artifacts and off-line averaging, further analys is was performed in a time range of 250-450 ms, corresponding to the P300 comp onent. Within this range, six topographically stable segments were found. A repea ted measures ANOVA was significant for the left-right directions of the positi ve and of the negative centroid, but not for the anterior-posterior directions . The posterior centroid was most right-located in the visual sensory modality a nd most left-located for tactile imagery; in the acoustic modality it had a midl ine-position. These differences in centroid locations during mental imagery in di fferent sensory modalities can be explained by the underlying activity of differ ent neural generator ensembles, possibly involving modality specific primary cortical areas.© 1997 Elsevier Science B.V. All rights reserved


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