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MEG based brain laterality: sex differences in normal adults

M Reite1, J Sheeder, P Teale

  • 1Department of Psychiatry, University of Colorado Health Sciences Center, Denver 80262, USA.

Neuropsychologia
|December 1, 1995
PubMed
Summary
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Magnetoencephalography reveals sex-based differences in auditory processing. Males show earlier M100 brain activity in the right hemisphere compared to females, suggesting distinct functional anatomy.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Auditory evoked fields, measured using magnetoencephalography (MEG), provide insights into the neural processing of sound.
  • The 100 msec latency component (M100) is a key marker of early auditory processing in the brain.

Purpose of the Study:

  • To investigate sex-based differences in the neuroanatomy and functional localization of the M100 component of auditory evoked fields.
  • To explore potential sex differences in hemispheric lateralization of auditory processing.

Main Methods:

  • Magnetoencephalography (MEG) was used to record auditory evoked fields from 34 healthy adults (17 males, 17 females) in response to short tone pips.
  • The 100 msec latency component (M100) was localized in both left and right hemispheres.

Related Experiment Videos

  • Magnetic resonance (MR) imaging was used to analyze the anatomy of the superior temporal gyri (STG) in a subset of participants.

    • Main Results:

    • M100 sources were found to be significantly more anterior in the right hemisphere of males compared to females.
    • In the left superior temporal gyrus (STG), M100 sources were located similarly in both sexes.
    • In the right STG, M100 sources were significantly further anterior in males than in females.

    Conclusions:

    • The findings suggest a sex-based difference in the functional anatomy of the right superior temporal gyrus.
    • Evidence points towards greater hemispheric lateralization in males for auditory processing, with a stronger right hemisphere contribution.
    • These results contribute to understanding the neurobiological underpinnings of sex differences in auditory perception.