The costs of monitoring simultaneously two sensory modalities decrease when dividing attention in space

Valerio Santangelo, Sabrina Fagioli, Emiliano Macaluso

Research output: Contribution to journalArticlepeer-review

Abstract

Traditional views of multisensory integration emphasise the advantage of stimulating or attending to different senses at one single spatial location. We challenge this view demonstrating that in-parallel processing of two sensory modalities can be more efficient when attention is spatially divided rather than focused. We asked subjects to monitor simultaneously vision and audition either at one location (focused attention) or in the two opposite hemifields (divided attention) or to monitor one single modality at one or two locations. Behavioural results demonstrated that the costs of monitoring two modalities, versus one modality, decrease when spatial attention is divided between two separate locations compared with focused attention. Neuroimaging data revealed increased activity in the posterior-parietal cortex (PPC) when monitoring two modalities at different locations, while no specific region was recruited in the focused attention conditions. We suggest that supramodal control and the integration of spatial representations hinders the selection of independent sensory streams when attention is spatially focused, while a greater exploitation of modality-specific resources and the engagement of PPC allows in-parallel processing when attention is spatially divided.

Original languageEnglish
Pages (from-to)2717-2727
Number of pages11
JournalNeuroImage
Volume49
Issue number3
DOIs
Publication statusPublished - Feb 1 2010

Keywords

  • Audiovisual
  • Divided
  • fMRI
  • Focused
  • Modality specific
  • Multisensory
  • Spatial attention
  • Supramodal

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

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