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Related Experiment Videos

Auditory evoked magnetic fields after ischemic brain lesions.

J P Mäkelä1, R Hari, L Valanne

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

Annals of Neurology
|July 1, 1991
PubMed
Summary

Auditory evoked magnetic fields, specifically the N100m deflection, were studied in patients with auditory cortex lesions. Large temporoparietal lesions abolished N100m, suggesting its utility in assessing auditory cortical function.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Clinical Neurophysiology

Background:

  • Auditory evoked magnetic fields provide insights into auditory processing.
  • Ischemic lesions can affect auditory cortex function.
  • The N100m deflection is a key component of auditory evoked magnetic fields.

Purpose of the Study:

  • To investigate the impact of ischemic lesions on auditory evoked magnetic fields, particularly the N100m.
  • To evaluate the clinical utility of auditory evoked magnetic field recordings in patients with auditory cortex damage.

Main Methods:

  • Recording auditory evoked magnetic fields in response to noise/square-wave sequences.
  • Analyzing the N100m deflection in 8 patients with ischemic lesions in or near the auditory cortex.

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  • Correlating lesion location and size with N100m presence and amplitude.

    • Main Results:

    • The magnetic 100-msec deflection (N100m) was absent in 2 patients with large temporoparietal lesions.
    • A diminished N100m was observed in 1 patient with a large frontotemporal lesion.
    • Frontal lesions or smaller perisupra-temporal lesions did not affect N100m.

    Conclusions:

    • Auditory evoked magnetic field recordings, especially the N100m, are sensitive to significant auditory cortex lesions.
    • These recordings show potential as a clinical tool for evaluating auditory cortical function in patients with brain injury.