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Magnetic auditory evoked fields: interhemispheric asymmetry.

M Reite, J T Zimmerman, J E Zimmerman

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1981
    PubMed
    Summary
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    Magnetic auditory evoked fields (MAEFs) show stronger responses in the auditory cortex when sound is presented to the opposite ear. This suggests a predominantly crossed auditory pathway and/or greater cortical activation from contralateral stimulation.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Magnetoencephalography

    Background:

    • Auditory evoked fields provide insights into the brain's processing of sound.
    • Understanding hemispheric differences in auditory processing is crucial for neuroscience.

    Purpose of the Study:

    • To investigate hemispheric differences in magnetic auditory evoked fields (MAEFs).
    • To compare MAEF amplitudes elicited by contralateral, ipsilateral, and bilateral auditory stimulation.

    Main Methods:

    • Recorded MAEFs from the right and left hemispheres using magnetoencephalography.
    • Administered 128 click stimuli to contralateral, ipsilateral, and both ears.

    Main Results:

    • Right hemisphere MAEFs showed higher amplitude with contralateral stimulation in 9/11 subjects (135% of ipsilateral).

    Related Experiment Videos

  • Left hemisphere MAEFs demonstrated higher amplitude with contralateral stimulation in all 7 subjects (145% of ipsilateral).

    • Conclusions:

    • Findings support the hypothesis of a predominantly crossed auditory pathway.
    • Contralateral auditory stimulation may activate a larger cortical area than ipsilateral stimulation.