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Acoustic Change Complex: Clinical Implications.

Jae-Ryong Kim1

  • 1Department of Otolaryngology-Head and Neck Surgery, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.

Journal of Audiology & Otology
|January 16, 2016
PubMed
Summary

The acoustic change complex (ACC) is a brainwave measuring sound discrimination. This objective auditory test shows promise for clinical evaluation of hearing capacity, even in challenging listening situations.

Keywords:
Acoustic change complexAuditory discriminationCortical auditory evoked potential

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Clinical Auditory Evoked Potentials

Background:

  • The P1-N1-P2 waveform reflects auditory cortex neural encoding but not sound discrimination.
  • Behavioral sound discrimination capacity requires specific neural processing measurement.
  • The acoustic change complex (ACC) offers a method to assess this processing.

Purpose of the Study:

  • To review the characteristics and clinical implications of the ACC.
  • To highlight the ACC's potential for evaluating auditory discrimination.
  • To discuss its utility in objective clinical assessments.

Main Methods:

  • The ACC is recorded as a modified P1-N1-P2 waveform in response to acoustic changes.
  • Stimulus parameters include changes in intensity, spectrum, and gap duration.
  • Test-retest reliability and agreement with behavioral measures are assessed.

Main Results:

  • ACC amplitude correlates with the magnitude of acoustic changes.
  • Reliable ACC recording is possible in individuals with normal hearing, hearing loss, hearing aids, and cochlear implants.
  • ACC detection occurs even without attention and with minimal stimulus presentations.

Conclusions:

  • The ACC indicates the brain's detection of sound changes and capacity for discrimination.
  • ACC shows good test-retest reliability and agreement with behavioral measures.
  • The ACC is a promising tool for objective clinical evaluation of auditory discrimination and speech perception.