Multisensory auditory-visual interactions during early sensory processing in humans: a high-density electrical mapping study

Détails

ID Serval
serval:BIB_2C984CC5A8F7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Multisensory auditory-visual interactions during early sensory processing in humans: a high-density electrical mapping study
Périodique
Brain Research. Cognitive Brain Research
Auteur⸱e⸱s
Molholm  S., Ritter  W., Murray  M. M., Javitt  D. C., Schroeder  C. E., Foxe  J. J.
ISSN
0926-6410
Statut éditorial
Publié
Date de publication
06/2002
Peer-reviewed
Oui
Volume
14
Numéro
1
Pages
115-28
Notes
Comparative Study
Journal Article
Research Support, U.S. Gov't, P.H.S. --- Old month value: Jun
Résumé
Integration of information from multiple senses is fundamental to perception and cognition, but when and where this is accomplished in the brain is not well understood. This study examined the timing and topography of cortical auditory-visual interactions using high-density event-related potentials (ERPs) during a simple reaction-time (RT) task. Visual and auditory stimuli were presented alone and simultaneously. ERPs elicited by the auditory and visual stimuli when presented alone were summed ('sum' ERP) and compared to the ERP elicited when they were presented simultaneously ('simultaneous' ERP). Divergence between the 'simultaneous' and 'sum' ERP indicated auditory-visual (AV) neural response interactions. There was a surprisingly early right parieto-occipital AV interaction, consistent with the finding of an earlier study [J. Cogn. Neurosci. 11 (1999) 473]. The timing of onset of this effect (46 ms) was essentially simultaneous with the onset of visual cortical processing, as indexed by the onset of the visual C1 component, which is thought to represent the earliest cortical visual evoked potential. The coincident timing of the early AV interaction and C1 strongly suggests that AV interactions can affect early visual sensory processing. Additional AV interactions were found within the time course of sensory processing (up to 200 ms post stimulus onset). In total, this system of AV effects over the scalp was suggestive of both activity unique to multisensory processing, and the modulation of 'unisensory' activity. RTs to the stimuli when presented simultaneously were significantly faster than when they were presented alone. This RT facilitation could not be accounted for by probability summation, as evidenced by violation of the 'race' model, providing compelling evidence that auditory-visual neural interactions give rise to this RT effect.
Mots-clé
Acoustic Stimulation/methods Adult Auditory Perception/*physiology Brain Mapping/*methods Evoked Potentials/*physiology Female Humans Male Photic Stimulation/methods Visual Perception/*physiology
Pubmed
Création de la notice
21/01/2008 10:23
Dernière modification de la notice
20/08/2019 13:11
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