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P1 amplitude across replicates: does measurement method make a difference?

Charles Gordon Marx1, Edward L Goshorn

  • 1Department of Speech and Hearing Sciences, The University of Southern Mississippi, Hattiesburg, Mississippi 39406-0001, USA. charles.marx@usm.edu

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|June 5, 2013
PubMed
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The peak-to-trough (P-T) amplitude measure is more sensitive than peak-to-baseline (P-B) in detecting changes in the P1 component of cortical auditory evoked potentials during repeated testing.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Electrophysiology

Background:

  • Cortical auditory evoked potentials (CAEPs) are crucial for assessing auditory pathway function.
  • Standard CAEP analysis often uses peak-to-baseline (P-B) amplitude, with peak-to-trough (P-T) amplitude as an alternative.
  • The sensitivity of these measures to repeated testing effects on specific CAEP components is not fully understood.

Purpose of the Study:

  • To compare the sensitivity of P-B and P-T amplitude measures in detecting changes in the P1 component of CAEPs.
  • To investigate the impact of repeated stimulus presentations on P1 amplitude and latency.

Main Methods:

  • CAEPs were recorded from 30 young adults with normal hearing.
  • Three stimuli were used: synthetic /da/, and 40- and 80-millisecond 1 kHz tone bursts.

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  • Three serial replicates of each stimulus were presented, and P1 amplitude and latency were measured.

    • Main Results:

    • P-T amplitudes significantly decreased across replicates for all stimuli (P < 0.01).
    • P-B amplitudes did not show significant changes across replicates.
    • P1 latency increased significantly from replicate 1 to 3 for the 40-millisecond tone (P = 0.024).

    Conclusions:

    • The P-T amplitude measure is more sensitive than the P-B measure for detecting amplitude decrements in the P1 component of CAEPs due to repeated runs.
    • These findings highlight the importance of considering the amplitude measurement method when analyzing CAEPs, particularly P1.
    • P-T amplitude may be a more reliable indicator of subtle electrophysiological changes in auditory processing.