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Sounds activate visual cortex and improve visual discrimination.

Wenfeng Feng1, Viola S Störmer2, Antigona Martinez3

  • 1Department of Psychology, School of Education, SooChow University, Suzhou, Jiangsu 215123, China, Department of Neurosciences, University of California, San Diego, La Jolla, California 92093-0608, fengwfly@gmail.com.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 18, 2014
PubMed
Summary

Peripheral sounds automatically activate visual cortex, enhancing visual processing. This auditory-evoked contralateral occipital positivity (ACOP) indicates attention is drawn to the sound's location, improving target discrimination.

Keywords:
ACOPERPsoundvisual cortexvisual discrimination

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory-Visual Interaction

Background:

  • Peripheral sounds can automatically activate the contralateral visual cortex.
  • This activation is measurable via auditory-evoked contralateral occipital positivity (ACOP).
  • The functional significance of this cross-modal activation requires further investigation.

Purpose of the Study:

  • To investigate the functional significance of sound-evoked ACOP.
  • To determine if ACOP predicts enhanced perceptual processing of subsequent visual targets.
  • To identify the neural generators of ACOP.

Main Methods:

  • Trial-by-trial analysis of ACOP amplitude in relation to visual target discrimination accuracy.
  • Dipole modeling of scalp topography to localize neural generators.
  • Recording of event-related potentials to visual targets.

Main Results:

  • ACOP amplitude was significantly larger before correct visual discriminations.
  • Neural generators of ACOP were localized to the ventrolateral extrastriate visual cortex.
  • Larger ACOP predicted improved discrimination of colocalized visual targets.

Conclusions:

  • Sound-evoked ACOP demonstrates automatic cross-modal activation of visual cortex.
  • This activation facilitates discriminative processing of subsequent visual targets at the sound's location.
  • ACOP reflects the automatic orienting of visual attention to salient sounds.