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Related Experiment Videos

The temporal relationship between the brainstem and primary cortical auditory evoked potentials

N A Shaw1

  • 1Department of Physiology, University of Auckland, New Zealand.

Progress in Neurobiology
|October 1, 1995
PubMed
Summary

Comparing brainstem and cortical auditory evoked potentials reveals central auditory conduction time is 12 msec. This suggests brainstem auditory evoked potential (BAEP) components originate lower in the auditory pathway than previously thought.

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Area of Science:

  • Neuroscience
  • Auditory Evoked Potentials
  • Neurophysiology

Background:

  • Precisely defining the generators of evoked potentials (EPs) is crucial for understanding auditory processing.
  • Comparing well-established EPs with less certain ones aids in pinpointing neural origins.
  • The primary cortical auditory evoked potential (PCAEP) and brainstem auditory evoked potential (BAEP) are key electrophysiological measures.

Purpose of the Study:

  • To compare the timing of the PCAEP with the subcomponents of the BAEP.
  • To calculate central auditory conduction time (CACT) and investigate the origin of BAEP components.
  • To explore the relationship between BAEP, PCAEP, and middle latency auditory evoked potentials (AEPs).

Main Methods:

  • Retrospective analysis of recorded PCAEP and BAEP data.

Related Experiment Videos

  • Calculation of CACT by subtracting BAEP wave III latency from PCAEP latency.
  • Analysis of interpeak latencies between BAEP waves V, VI, VII, and PCAEP.

    • Main Results:

    • Central auditory conduction time (CACT) in humans was determined to be 12 msec.
    • CACT is more than double the central somatosensory conduction time.
    • Early middle latency AEP components (No and Na) fall temporally between BAEP and PCAEP, suggesting subcortical origins.

    Conclusions:

    • BAEP components (waves V, VI, VII) likely originate more caudally in the central auditory system than commonly assumed.
    • The timing reconciliation suggests BAEP generation is restricted to the auditory nerve and lower pons.
    • Ascending auditory volleys generate slower post-synaptic waves rather than rapid BAEP responses.