Is audiovisual integration subserved by the superior colliculus in humans?

Angelo Maravita, Nadia Bolognini, Emanuela Bricolo, Carlo A. Marzi, Silvia Savazzi

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)271-275
Number of pages5
JournalNeuroReport
Volume19
Issue number3
DOIs
Publication statusPublished - Feb 2008

Keywords

  • Audiovisual integration
  • Multisensory integration
  • Redundant signal effect
  • Sensory processing
  • Subcortical
  • Superior colliculus

ASJC Scopus subject areas

  • Neuroscience(all)

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