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Sound Level Changes the Auditory Cortical Activation Detected with Functional Near-Infrared Spectroscopy.

Sterling W Sheffield1, Eric Larson2, Iliza M Butera3

  • 1Department of Speech, Language, and Hearing Science, University of Florida, 1225 Center Drive Room 2130, Gainesville, FL, 32160, USA. sterling.w.sheffield@gmail.com.

Brain Topography
|July 1, 2023
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Summary
This summary is machine-generated.

Functional near-infrared spectroscopy (fNIRS) effectively measures brain activity in cochlear implant (CI) users. Auditory stimulus levels correlate with brain responses, but loudness perception in CI users adds complexity.

Keywords:
Cochlear implantsFunctional near-infrared spectroscopyLoudness ratingsStimulus level

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Biomedical Engineering

Background:

  • Functional near-infrared spectroscopy (fNIRS) is a non-invasive neuroimaging technique suitable for cochlear implant (CI) research.
  • The impact of acoustic stimulus features on fNIRS signals in CI users requires further investigation.

Purpose of the Study:

  • To investigate the effect of stimulus sound levels on fNIRS responses in individuals with normal hearing (NH) and bilateral CIs.
  • To test the hypothesis that fNIRS responses correlate with stimulus level and subjective loudness, with a potentially weaker correlation in CI users.

Main Methods:

  • Thirteen bilateral CI users and 16 NH adults participated.
  • Signal-correlated noise, a speech-shaped noise, was used to assess responses to varying sound levels (soft to loud).
  • Cortical activity in the left hemisphere was monitored using fNIRS.

Main Results:

  • A positive correlation was observed between cortical activation in the left superior temporal gyrus and stimulus level for both NH and CI groups.
  • An additional correlation between cortical activity and perceived loudness was found in the CI group.
  • Results align with existing literature and the study's hypotheses.

Conclusions:

  • fNIRS can effectively assess auditory stimulus level effects at a group level in CI populations.
  • Controlling for stimulus level and perceived loudness is crucial in speech recognition studies involving CI users.
  • Further research is needed to elucidate cortical activation patterns related to speech recognition, considering both stimulus level and perceived loudness.