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Related Experiment Video

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Author Spotlight: Investigating Vocal Information Representation in Small Primates and Its Alteration by Psychiatric Disorders Using Noninvasive EEG
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Extending Subcortical EEG Responses to Continuous Speech to the Sound-Field.

Florine L Bachmann1, Joshua P Kulasingham2, Kasper Eskelund3

  • 1Eriksholm Research Centre, Snekkersten, Denmark.

Trends in Hearing
|May 13, 2024
PubMed
Summary

Objective hearing assessments using auditory brainstem response (ABR) can now detect brainstem responses to continuous speech in sound-field conditions. This method requires 16 minutes of data, offering a more realistic evaluation for improved hearing technologies.

Keywords:
auditory brainstem responseelectroencephalographyneural speech processingspeech ABRtemporal response function

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Area of Science:

  • Neuroscience
  • Audiology
  • Bioengineering

Background:

  • Auditory brainstem response (ABR) traditionally uses brief stimuli for hearing assessment.
  • Recent advancements allow detection of brainstem responses to continuous speech using temporal response functions (TRFs).

Purpose of the Study:

  • To measure subcortical responses to continuous speech in sound-field conditions.
  • To determine the data duration necessary for accurate brainstem TRF estimation.
  • To compare sound-field TRFs with earphone-based TRFs and click ABRs.

Main Methods:

  • Electroencephalography (EEG) recorded from 24 participants listening to speech stimuli.
  • Subcortical TRFs computed using auditory nerve models to account for peripheral non-linearity.
  • Comparison of TRFs derived from earphone and sound-field stimuli.

Main Results:

  • Subcortical responses to continuous speech were reliably measured in sound-field conditions.
  • Auditory nerve models provided superior TRF estimation compared to simple rectification.
  • 16 minutes of data sufficed for clear wave V peaks in sound-field TRFs, with earphone TRFs requiring 12 minutes.

Conclusions:

  • Subcortical TRFs to continuous speech are consistent across earphone, sound-field, and click ABR conditions.
  • Sound-field speech stimuli bring objective hearing assessment closer to real-life scenarios.
  • Findings support advancements in hearing evaluations and smart hearing technologies.