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Processing of auditory spatial cues in human cortex: an fMRI study.

Ulrike Zimmer1, Jörg Lewald, Michael Erb

  • 1Section Neuropsychology, Department of Cognitive Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.

Neuropsychologia
|July 26, 2005
PubMed
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The human brain processes sound location using a widespread network across both hemispheres, not exclusive areas. However, specific regions show preference for central sound perception.

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Brain Imaging

Background:

  • The precise cortical representation of sound location remains debated.
  • It is unclear if distinct brain areas process sounds from different spatial locations or if hemispheres process sounds from contralateral sides.
  • The potential for specific areas to process central versus eccentric sound locations is unexplored.

Purpose of the Study:

  • To investigate the cortical representation of sound location.
  • To determine if specific brain areas are activated by sounds from left, right, or central locations.
  • To explore if distinct areas prefer processing central over eccentric sound positions.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.

Related Experiment Videos

  • Brain activations to left, right, and central sounds were analyzed separately.
  • Contrasts between different sound location conditions were computed.

    • Main Results:

    • No exclusive cortical areas for left, right, or central sound processing were identified.
    • Overlapping activation across temporal, parietal, and frontal cortices in both hemispheres was observed for all sound locations.
    • The right inferior parietal cortex (BA 40) showed a preference for processing central sound positions over eccentric ones.

    Conclusions:

    • Sound location coding involves a widely distributed, bilateral network.
    • This network likely utilizes an internal body representation to encode sound position relative to the body's midline.
    • The right inferior parietal cortex may play a preferential role in perceiving central auditory stimuli, similar to its role in visual perception.