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Is audiovisual integration subserved by the superior colliculus in humans?

Authors
  • Maravita, Angelo
  • Bolognini, Nadia
  • Bricolo, Emanuela
  • Marzi, Carlo A
  • Savazzi, Silvia
Type
Published Article
Journal
Neuroreport
Publisher
Ovid Technologies (Wolters Kluwer) - Lippincott Williams & Wilkins
Publication Date
Feb 12, 2008
Volume
19
Issue
3
Pages
271–275
Identifiers
DOI: 10.1097/WNR.0b013e3282f4f04e
PMID: 18303565
Source
Medline
License
Unknown

Abstract

The brain effectively integrates multisensory information to enhance perception. For example, audiovisual stimuli typically yield faster responses than isolated unimodal ones (redundant signal effect, RSE). Here, we show that the audiovisual RSE is likely subserved by a neural site of integration (neural coactivation), rather than by an independent-channels mechanism such as race models. This neural site is probably the superior colliculus (SC), because an RSE explainable by neural coactivation does not occur with purple or blue stimuli, which are invisible to the SC; such an RSE only occurs for spatially and temporally coincident audiovisual stimuli, in strict adherence with the multisensory responses in the SC of the cat. These data suggest that audiovisual integration in humans occurs very early during sensory processing, in the SC.

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