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Related Experiment Video

Updated: Jul 11, 2026

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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Attention to touch weakens audiovisual speech integration.

Agnès Alsius1, Jordi Navarra, Salvador Soto-Faraco

  • 1Departament de Psicologia Bàsica, Universitat de Barcelona, Pg. Vall d'Hebrón 171, Barcelona, 08035, Spain. aalsius@gmail.com

Experimental Brain Research
|September 28, 2007
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Summary

Audiovisual speech integration, like the McGurk effect, is reduced when attention is diverted to a tactile task. This suggests supramodal attention limitations impact multisensory binding.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Integration

Background:

  • Audiovisual speech integration, a classic example of multisensory integration, binds auditory speech sounds with visual articulatory gestures.
  • Previous research suggests this integration is attention-dependent, decreasing with depleted visual or auditory attentional resources.
  • The current study investigates if this attention constraint extends to non-speech sensory domains.

Purpose of the Study:

  • To determine if demanding attention in a non-speech sensory modality (touch) affects audiovisual speech integration.
  • To test the hypothesis that supramodal attention limitations modulate crossmodal binding mechanisms.
  • To explore the dynamic interactions between attention and multisensory integration.

Main Methods:

  • Utilized the McGurk illusion as a measure of audiovisual speech integration.
  • Employed a dual-task paradigm where participants performed a difficult tactile task concurrently.
  • Measured the impact of attentional load in the tactile domain on audiovisual speech perception.

Main Results:

  • A significant reduction in visually influenced responses (McGurk illusion) was observed when attention was directed to the tactile task.
  • This indicates that diverting attentional resources to a non-speech modality impairs audiovisual speech integration.
  • The findings support the role of supramodal attention in modulating multisensory processing.

Conclusions:

  • Audiovisual speech integration is constrained by general attentional limitations, not just modality-specific ones.
  • Supramodal attention plays a crucial role in mediating the interaction between attention and crossmodal binding.
  • The relationship between attentional systems and multisensory integration is more dynamic and extensive than previously thought.