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Related Experiment Video

Updated: Sep 20, 2025

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Prefrontal cortex supports speech perception in listeners with cochlear implants.

Arefeh Sherafati¹, Noel Dwyer², Aahana Bajracharya²

¹Department of Radiology, Washington University in St. Louis, St. Louis, United States.

|June 6, 2022

Summary

This summary is machine-generated.

Listeners with cochlear implants (CI) show increased left prefrontal cortex activity during speech understanding, suggesting greater cognitive effort. This compensatory brain activity may support hearing restoration in individuals with severe to profound hearing loss.

Keywords:

HD-DOT cochlear implant diffuse optical tomography fNIRS human neuroscience speech perception

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Published on: January 9, 2019

Area of Science:

Neuroscience
Auditory Neuroscience
Medical Engineering

Background:

Cochlear implants (CIs) restore hearing but lack acoustic detail compared to normal hearing.
Speech understanding in CI users is often poorer and more effortful.
Brain networks for speech processing in CI users are not well understood due to imaging challenges.

Purpose of the Study:

To investigate brain regions supporting spoken word understanding in adult CI users.
To compare brain activity between CI users and normal-hearing controls using neuroimaging.

Main Methods:

Utilized high-density diffuse optical tomography (HD-DOT), a non-invasive neuroimaging technique.
Assessed brain activity in 20 adult unilateral CI users and 18 matched normal-hearing controls.
Measured brain responses during spoken word listening in quiet conditions.

Main Results:

CI users exhibited greater activation in the left prefrontal cortex compared to controls.
This heightened activity was observed in a region associated with spatial working memory.
Suggests increased cognitive processing demands for speech understanding in CI users.

Conclusions:

CI listeners recruit the left prefrontal cortex to compensate for reduced acoustic information.
This compensatory mechanism highlights the significant cognitive resources required for speech processing with cochlear implants.
Findings advance understanding of neural plasticity and auditory rehabilitation.