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Neuropsychologia. 2007 Feb 1;45(3):578-86. Epub 2006 Apr 19.

Utilizing the ventriloquism-effect to investigate audio-visual binding.

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1
Bender Institute of Neuroimaging and Department of Clinical and Physiological Psychology, Justus-Liebig-University, Giessen, Germany. matthias.bischoff@psychol.uni-giessen.de

Abstract

Audio-visual binding - as subset of crossmodal integration - describes the combination of information across both these senses to the subjective unified perception of a bound object. We investigated audio-visual binding by using the ventriloquism-effect (localization of a sound is biased towards and by a simultaneous visual stimulus) to act as an indicator for perceived binding. Simple visual and auditory stimuli were presented synchronously or asynchronously. fMRI was recorded during task performance (n = 19 subjects) in order to reveal activation in areas discussed to be involved in multisensory processing in the literature. Contrasting trials with reported ventriloquism-effect versus the no-binding condition revealed activation in the insula, superior temporal sulcus and parieto-occipital sulcus. Implementing the ventriloquism-effect allows us to relate these activations to consciousness-related processes, which probably are different from stimulus-driven multisensory integration in subcortical areas.

[Indexed for MEDLINE]

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