Universität zu Köln

Weglage, Anna ORCID: 0000-0002-4824-3293, Muller, Verena, Layer, Natalie, Abdel-Latif, Khaled H. A., Lang-Roth, Ruth, Walger, Martin and Sandmann, Pascale (2022). Side-of-Implantation Effect on Functional Asymmetry in the Auditory Cortex of Single-Sided Deaf Cochlear-Implant Users. Brain Topogr., 35 (4). S. 431 - 453. DORDRECHT: SPRINGER. ISSN 1573-6792

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Abstract

Cochlear implants (CIs) allow to restore the hearing function in profoundly deaf individuals. Due to the degradation of the stimulus by CI signal processing, implanted individuals with single-sided deafness (SSD) have the specific challenge that the input highly differs between their ears. The present study compared normal-hearing (NH) listeners (N = 10) and left- and right-ear implanted SSD CI users (N = 10 left, N = 9 right), to evaluate cortical speech processing between CI- and NH-ears and to explore for side-of-implantation effects. The participants performed a two-deviant oddball task, separately with the left and the right ear. Auditory event-related potentials (ERPs) in response to syllables were compared between proficient and non-proficient CI users, as well as between CI and NH ears. The effect of the side of implantation was analysed on the sensor and the source level. CI proficiency could be distinguished based on the ERP amplitudes of the N1 and the P3b. Moreover, syllable processing via the CI ear, when compared to the NH ear, resulted in attenuated and delayed ERPs. In addition, the left-ear implanted SSD CI users revealed an enhanced functional asymmetry in the auditory cortex than right-ear implanted SSD CI users, regardless of whether the syllables were perceived via the CI or the NH ear. Our findings reveal that speech-discrimination proficiency in SSD CI users can be assessed by N1 and P3b ERPs. The results contribute to a better understanding of the rehabilitation success in SSD CI users by showing that cortical speech processing in SSD CI users is affected by CI-related stimulus degradation and experience-related functional changes in the auditory cortex.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Weglage, Anna UNSPECIFIED orcid.org/0000-0002-4824-3293 UNSPECIFIED Muller, Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED Layer, Natalie UNSPECIFIED UNSPECIFIED UNSPECIFIED Abdel-Latif, Khaled H. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lang-Roth, Ruth UNSPECIFIED UNSPECIFIED UNSPECIFIED Walger, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Sandmann, Pascale UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-658047
DOI:	10.1007/s10548-022-00902-3
Journal or Publication Title:	Brain Topogr.
Volume:	35
Number:	4
Page Range:	S. 431 - 453
Date:	2022
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-6792
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CROSS-MODAL PLASTICITY; EVENT-RELATED POTENTIALS; SPEECH-PERCEPTION; EVOKED-POTENTIALS; STIMULUS TYPE; SENTENCE TEST; NOISE; RECOGNITION; DISCRIMINATION; HEARING Multiple languages Clinical Neurology; Neurosciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/65804