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Related Experiment Videos

Where is 'where' in the human auditory cortex?

Robert J Zatorre1, Marc Bouffard, Pierre Ahad

  • 1Montreal Neurological Institute, McGill University, 3801 University Street, Montreal, Quebec H3A2B4, Canada. robert.zatorre@mcgill.ca

Nature Neuroscience
|August 27, 2002
PubMed
Summary
This summary is machine-generated.

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This study reveals that the posterior auditory cortex helps process overlapping sounds, while the right inferior parietal cortex is crucial for sound localization tasks in the human brain.

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Spatial Cognition

Background:

  • The precise functional roles of auditory and parietal cortices in spatial hearing remain debated.
  • Understanding the dissociation between auditory and parietal mechanisms is key to auditory processing models.

Purpose of the Study:

  • To investigate the functional characteristics of human auditory cortical areas sensitive to spatial cues.
  • To determine if these auditory areas can be functionally dissociated from parietal lobe mechanisms.
  • To clarify the involvement of posterior auditory and parietal cortices in sound localization and source separation.

Main Methods:

  • Three positron emission tomography (PET) experiments were conducted.
  • Utilized a speaker array for quasi free-field sound presentation within a scanner.

Related Experiment Videos

  • Analyzed brain activity during auditory tasks involving spatial cues and complex stimuli.

    • Main Results:

    • Posterior auditory cortex responded to spatially varying sounds, particularly when complex stimuli overlapped, aiding in source disambiguation.
    • The right inferior parietal cortex showed specific recruitment during sound localization tasks.
    • Activity in the right inferior parietal cortex correlated with behavioral performance in localization.

    Conclusions:

    • Posterior auditory cortex plays a role in disambiguating overlapping auditory sources.
    • The right inferior parietal cortex is critical for sensorimotor integration and spatial transformation in auditory localization.
    • Findings help reconcile competing models of auditory cortical organization and clarify functional roles.