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Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

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Impact of Reduced Spectral Resolution on Temporal-Coherence-Based Source Segregation.

Vibha Viswanathan¹, Michael G Heinz², Barbara G Shinn-Cunningham¹

¹Neuroscience Institute, Carnegie Mellon University, Pitttsburgh, PA 15213.

Biorxiv : the Preprint Server for Biology

|April 8, 2024

Summary

This summary is machine-generated.

Reduced spectral resolution impairs hearing in noise for individuals with hearing loss, including cochlear implant (CI) users. This degradation affects the brain's ability to segregate sound sources, impacting speech understanding.

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Area of Science:

Auditory Neuroscience
Speech Perception
Hearing Impairment

Background:

Hearing-impaired listeners, including those with cochlear implants (CIs), face challenges understanding speech in noisy environments.
Effective listening in noise relies on the brain's auditory source segregation, grouping sounds into distinct perceptual streams.
Temporal coherence across frequency channels aids normal-hearing listeners in source segregation.

Approach:

Investigated the hypothesis that reduced spectral resolution impairs temporal-coherence-based auditory segregation.
Utilized a physiologically plausible computational model of temporal-coherence processing.
Simulated CI listening conditions and varying degrees of sensorineural hearing loss.

Key Points:

Reduced spectral resolution, common in hearing loss and CI use, hinders the brain's ability to segregate sound sources based on temporal coherence.
Computational model predictions align with behavioral data, showing CI current spread reduces comodulation masking release (CMR) and speech intelligibility.
Model predicts diminished CMR with increased outer-hair-cell damage, indicating a broader impact of spectral degradation.

Conclusions:

Reduced spectral resolution is a key factor impairing auditory segregation and speech-in-noise understanding for hearing-impaired listeners.
Findings highlight the detrimental effect of spectral smearing on temporal-coherence processing, crucial for complex auditory scenes.
The study provides insights into the mechanisms underlying listening difficulties in sensorineural hearing loss and CI users.