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The auditory evoked sustained field: origin and frequency dependence

C Pantev1, C Eulitz, T Elbert

  • 1Wilhelms-University of Münster, Institute of Experimental Audiology, Centre of Biomagnetism, Germany.

Electroencephalography and Clinical Neurophysiology
|January 1, 1994
PubMed
Summary

This study investigated auditory evoked sustained magnetic fields (SF). Findings show SF originates in the supratemporal cortex and exhibits tonotopic organization, supporting its role in auditory processing.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Biophysics

Background:

  • Sustained auditory stimulation causes baseline shifts in electrophysiological and magnetic recordings.
  • The neural generators and tonotopic organization of the sustained field (SF) remain incompletely understood.

Purpose of the Study:

  • To investigate the frequency-dependent magnetic field distribution of the auditory evoked sustained field (SF).
  • To determine the origin and tonotopic organization of SF activity within the human auditory cortex.

Main Methods:

  • Presented 2-second tone bursts (250, 1000, 4000 Hz) at 60 dB nHL to 11 subjects.
  • Recorded magnetic field distributions with varying interstimulus intervals (5-7 seconds).
  • Analyzed equivalent current dipole locations of SF and M100 wave.

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Main Results:

  • Auditory evoked SF distributions suggest origin in the supratemporal cortex.
  • SF source locations showed tonotopic organization across tested frequencies.
  • SF and M100 wave sources are consistent across subjects and located on the primary auditory cortex surface.

Conclusions:

  • The auditory evoked sustained field activity originates in the supratemporal cortex.
  • SF exhibits tonotopic mapping, supporting its role in frequency processing within the primary auditory cortex.
  • Both M100 and SF likely arise from current dipole sheets on the superior surface of the primary auditory cortex.