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Related Experiment Videos

Lateralized irrelevant speech alters visuospatial selective attention mechanisms.

Michael Schaefer1, Uwe Tewes, Thomas F Münte

  • 1Human Cortical Physiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bldg. 10, Room 5N-234, Bethesda, MD 20892, USA. schaefem@ninds.nih.gov

Biological Psychology
|September 29, 2005
PubMed
Summary

Irrelevant speech, even when not attended, can affect visual attention. This suggests that auditory and visual attention systems are linked early in perception, influencing how we process visual information.

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Area of Science:

  • Cognitive Neuroscience
  • Auditory and Visual Perception

Background:

  • Spatial attention can be coordinated across different sensory modalities.
  • A supramodal attentional system may mediate this cross-modal coordination.

Purpose of the Study:

  • To investigate if irrelevant speech modulates visuospatial attention.
  • To explore crossmodal links between auditory speech processing and visual attention.

Main Methods:

  • Event-related potentials (ERPs) were recorded in 12 healthy participants.
  • A visuospatial selective attention task was employed with visual stimuli.
  • Task-irrelevant speech (understandable and ununderstandable) was presented at attended and unattended visual locations.

Main Results:

Related Experiment Videos

  • Attending to visual stimuli enhanced early ERP components (P1 and N1).
  • Speech presented in the unattended visual field decreased the N1 amplitude.
  • This effect was more pronounced for understandable speech, indicating speech influences visual spatial attention allocation.

    • Conclusions:

    • Speech signals involuntarily modulate visuospatial attention, even when presented contralaterally to unattended stimuli.
    • These findings suggest early-stage crossmodal interactions between speech perception and visuospatial attention mechanisms.