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Functional asymmetry for auditory processing in human primary auditory cortex.

Joseph T Devlin1, Josephine Raley, Elizabeth Tunbridge

  • 1Centre for Functional Magnetic Resonance Imaging of the Brain, Department of Clinical Neurology, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom. devlin@fmrib.ox.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 20, 2003
PubMed
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Human auditory cortex shows left-hemisphere dominance for processing sounds, even at the primary auditory cortex level. This early functional lateralization may underpin the brain

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Brain Asymmetry

Background:

  • Structural brain asymmetries, particularly in the supratemporal plane, are linked to left-hemisphere language lateralization.
  • Auditory processing streams exhibit asymmetries, suggesting functional lateralization may begin in the primary auditory cortex.

Purpose of the Study:

  • To investigate functional lateralization within the human primary auditory cortex.
  • To determine if auditory cortex responses to sound exhibit hemispheric asymmetry.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants listened to monaurally presented tones (sounds) and silence.

Main Results:

Related Experiment Videos

  • Greater activation was observed in the left Heschl's gyrus compared to the right when tones were presented to either ear.
  • This indicates a functional lateralization for primary auditory cortex processing.

    • Conclusions:

    • Functional lateralization for auditory processing occurs early in the auditory pathway, within the primary auditory cortex.
    • This left-dominant functional asymmetry in humans differs from contralateral dominance in other mammals and may be crucial for the evolution of language lateralization.