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Deviant auditory stimuli activate human left and right auditory cortex differently

S Levänen1, A Ahonen, R Hari

  • 1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

Cerebral Cortex (New York, N.Y. : 1991)
|March 1, 1996
PubMed
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The brain detects auditory changes using neuromagnetic mismatch fields (MMF). This study found the right hemisphere processes sound changes faster and more globally than the left.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • The neuromagnetic mismatch field (MMF) is a brain response to infrequent, deviant auditory stimuli.
  • MMF is thought to reflect automatic change detection in the auditory cortex.
  • Previous research has not fully clarified hemispheric differences in MMF generation and auditory processing.

Purpose of the Study:

  • To investigate hemispheric differences in cortical auditory processing using MMF.
  • To determine if MMFs reveal distinct patterns of brain activation between the left and right hemispheres.
  • To explore the role of each hemisphere in automatic auditory change detection.

Main Methods:

  • Seven healthy adults participated in the study.
  • A whole-scalp neuromagnetometer was used to record brain activity.

Related Experiment Videos

  • Participants were presented with sequences of standard tones interspersed with three types of infrequent deviant stimuli (duration, frequency, interstimulus interval) delivered to one ear at a time.

    • Main Results:

    • MMFs peaked significantly earlier in the right hemisphere (9–34 ms) compared to the left hemisphere, regardless of the stimulated ear.
    • Deviant stimuli elicited a single MMF source in the left hemisphere.
    • Two overlapping MMF sources were required to explain the right hemisphere response: one in the temporal lobe and another in the inferior parietal cortex.

    Conclusions:

    • The findings suggest hemispheric specialization in auditory processing.
    • Right hemisphere MMF components, particularly the parietal one, may reflect more global auditory change detection.
    • The right hemisphere appears more involved than the left in automatic auditory change detection.