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Binaural phase effects in the auditory brainstem response

C G Fowler1, C M Mikami

  • 1Veterans Affairs Medical Center, Long Beach, California 90822, USA.

Journal of the American Academy of Audiology
|November 1, 1995
PubMed
Summary
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The auditory brainstem response (ABR) may reflect the masking level difference (MLD). A binaural phasic difference potential (BPD) in the ABR was found to be necessary, but not sufficient, for MLD generation.

Area of Science:

  • Auditory Neuroscience
  • Neurophysiology

Background:

  • Behavioral studies suggest the brainstem originates the masking level difference (MLD).
  • Previous research identified MLD correlates in later auditory evoked potentials.

Purpose of the Study:

  • Investigate a correlate of the MLD within the auditory brainstem response (ABR).
  • Examine the role of brainstem phase information processing in MLD generation.

Main Methods:

  • Presented tone pips (500–4000 Hz) in S(o)N(o) and S(pi)N(o) configurations to normal-hearing adults.
  • Derived a binaural phasic difference potential (BPD) by subtracting ABRs.
  • Assessed thresholds and analyzed a case study with absent behavioral MLD.

Main Results:

Related Experiment Videos

  • The BPD magnitude showed an inverse relationship with stimulus frequency.
  • Thresholds for 500-Hz tone pips were equivalent in both S(o)N(o) and S(pi)N(o) conditions.
  • An abnormal 500-Hz BPD in a case study suggested unilateral brainstem phase synchrony interruption.

    • Conclusions:

    • Brainstem processing of phase information is essential for MLD.
    • Maintaining phase information through the brainstem is necessary but not sufficient for MLD.
    • Findings align with previous studies on late potential MLD correlates.