Temporal Processing and Speech Perception Performance in Postlingual Adult Users of Cochlear Implants.

Area of Science:

• Audiology
• Neuroscience
• Speech and Hearing Sciences

Background:

• Cochlear implant (CI) users often struggle with auditory challenges, especially in complex environments.
• Temporal resolution is a critical auditory function significantly affected in CI users.

Purpose of the Study:

• To compare temporal resolution between CI users and normal-hearing individuals using the Gaps-in-Noise (GIN) test.
• To explore performance variations based on implanted ear, gender, CI type, and sound processor strategies.

Main Methods:

• A case-control study involving 18 normal-hearing adults and 18 postlingual adult CI users.
• Assessment included hearing thresholds, word recognition scores (WRS), and the GIN test (GIN threshold, total percentage score).
• Statistical analysis utilized the Mann-Whitney U test.

Main Results:

• CI users demonstrated significantly poorer word recognition scores (WRS) compared to the normal-hearing group (p < 0.001).
• CI users had significantly higher GIN thresholds (poorer temporal resolution) and lower total percentage scores (TPS) than normal-hearing individuals (p < 0.001).
• No significant differences in WRS were found based on implanted ear, gender, CI type, or sound processor strategies.

Conclusions:

• Cochlear implant users show impaired ability to discriminate gaps in noise compared to normal-hearing individuals.
• Despite audibility improvements, temporal processing deficits persist in CI users, affecting auditory perception.