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Related Experiment Video

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Cortical auditory evoked potential time-frequency growth functions for fully objective hearing threshold estimation.

Darren Mao1, Hamish Innes-Brown2, Matthew A Petoe2

  • 1Department of Biomedical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia.

Hearing Research
|October 19, 2018
PubMed
Summary

Cortical auditory evoked potential (CAEP) growth functions offer objective hearing threshold estimation. The peak phase-locking value (PLV) feature demonstrated the highest accuracy, making it a promising tool for clinical audiology.

Keywords:
ElectroencephalographyGrowth functionsHearing thresholdObjective audiometeryPhase-locking valueSpectral analysis

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Area of Science:

  • Auditory Neuroscience
  • Neurophysiology
  • Audiology

Background:

  • Cortical auditory evoked potential (CAEP) thresholds correlate with behavioral hearing thresholds.
  • CAEP growth functions show potential for objective hearing threshold estimation.
  • The clinical relevance and accuracy of CAEP growth functions require further examination.

Purpose of the Study:

  • To investigate the accuracy and clinical relevance of using temporal and spectral CAEP features for objective hearing threshold estimation.
  • To compare the performance of different CAEP features, including peak-to-peak amplitude, root-mean-square, peak spectral power, and peak phase-locking value (PLV).

Main Methods:

  • Behavioral hearing thresholds were obtained from 20 adults with normal hearing.
  • CAEPs were recorded in response to a 1 kHz puretone.
  • Four features (peak-to-peak amplitude, root-mean-square, peak spectral power, PLV) were extracted from CAEPs to generate feature growth functions.
  • Objective hearing threshold estimates were calculated and compared to behavioral thresholds.

Main Results:

  • The peak PLV feature yielded the best performance, with a mean threshold error of 2.7 dB and a standard deviation of 5.9 dB.
  • Estimates using peak PLV required approximately 14 minutes for 95% confidence within 20 dB of behavioral thresholds.
  • Spectral features, particularly PLV, may offer advantages over traditional methods due to potentially greater robustness with variable CAEP morphology.

Conclusions:

  • The phase-locking value (PLV) of CAEPs can be utilized for clinically relevant hearing threshold estimation.
  • PLV's stability with varying CAEP morphology presents a potential advantage for testing specific populations like infants or cochlear implant users.