Speech Comprehension by Cochlear Implant Users Assessed with Evoked Potentials and Response Times.

Autor:	Deshpande P; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.; Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital & University of Southern Denmark, Odense, Denmark., Van Yper L; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.; Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital & University of Southern Denmark, Odense, Denmark., Christiansen S; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.; Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital & University of Southern Denmark, Odense, Denmark., Brandt C; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.; Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital & University of Southern Denmark, Odense, Denmark., Debener S; Neuropsychology Lab, Department of Psychology, University of Oldenburg, Oldenburg, Germany., Neher T; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.; Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital & University of Southern Denmark, Odense, Denmark.
Jazyk:	angličtina
Zdroj:	Audiology & neuro-otology [Audiol Neurootol] 2024 Apr 27, pp. 1-13. Date of Electronic Publication: 2024 Apr 27.
DOI:	10.1159/000538701
Abstrakt:	Introduction: Cochlear implant (CI) users differ greatly in their rehabilitation outcomes, including speech understanding in noise. This variability may be related to brain changes associated with intact senses recruiting cortical areas from stimulation-deprived senses. Numerous studies have demonstrated such cross-modal reorganization in individuals with untreated hearing loss. How it is affected by regular use of hearing devices remains unclear, however. To shed light on this, the current study measured cortical responses reflecting comprehension abilities in experienced CI users and normal-hearing controls. Methods: Using multichannel electroencephalography, we tested CI users who had used their devices for at least 12 months and closely matched controls (N = 2 × 13). Cortical responses reflecting comprehension abilities - the N400 and late positive complex (LPC) components - were evoked using congruent and incongruent digit-triplet stimuli. The participants' task was to assess digit-triplet congruency by means of timed button presses. All measurements were performed in speech-shaped noise 15 dB above individually measured speech recognition thresholds. Three stimulus presentation modes were used: auditory-only, visual-only, and visual-then-auditory. Results: The analyses revealed no group differences in the N400 and LPC responses. In terms of response times, the CI users were slower and differentially affected by the three stimulus presentation modes relative to the controls. Conclusion: Compared to normal-hearing controls, experienced CI users may need more time to comprehend speech in noise. Response times can serve as a proxy for speech comprehension by CI users. (© 2024 S. Karger AG, Basel.)
Databáze:	MEDLINE
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