Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users

Joly, Charles-Alexandre; Reynard, Pierre; Hermann, Ruben; Seldran, Fabien; Gallego, Stéphane; Idriss, Samar; Thai-Van, Hung

doi:10.3390/jcm10245819

Open AccessArticle

Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users

by

Charles-Alexandre Joly

^1,2,3,

Pierre Reynard

^1,2,3

,

Ruben Hermann

^2,4,5,

Fabien Seldran

⁶,

Stéphane Gallego

^2,7,

Samar Idriss

³ and

Hung Thai-Van

^1,2,3,*

¹

Institut de l’Audition, Institut Pasteur, Université de Paris, INSERM, 75012 Paris, France

²

Université Claude Bernard Lyon 1, 69100 Villeurbanne, France

³

Service d’Audiologie et d’Explorations Otoneurologiques, Hôpital Edouard Herriot, Hospices Civils de Lyon, 69003 Lyon, France

⁴

Integrative, Multisensory, Perception, Action and Cognition Team (IMPACT), Inserm U1028, CNRS UMR5292, Lyon Neuroscience Research Center, 69675 Bron, France

⁵

Service d’ORL, Chirurgie Cervico-Faciale et d’Audiophonologie, Hospices Civils de Lyon, Hôpital Edouard Herriot, 69003 Lyon, France

⁶

MED-EL GmbH, CS 70062, 06902 Sophia Antipolis, France

⁷

Neuronal Dynamics and Audition Team (DNA), Laboratory of Cognitive Neuroscience, CNRS UMR7291, Aix-Marseille University, CEDEX 3, 13331 Marseille, France

^*

Author to whom correspondence should be addressed.

J. Clin. Med. 2021, 10(24), 5819; https://doi.org/10.3390/jcm10245819

Submission received: 10 November 2021 / Revised: 3 December 2021 / Accepted: 8 December 2021 / Published: 13 December 2021

(This article belongs to the Special Issue Cochlear Implantation and Hearing Rehabilitation)

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Abstract

Broader intra-cochlear current spread (ICCS) implies higher cochlear implant (CI) channel interactions. This study aimed to investigate the relationship between ICCS and speech intelligibility in experienced CI users. Using voltage matrices collected for impedance measurements, an individual exponential spread coefficient (ESC) was computed. Speech audiometry was performed to determine the intelligibility at 40 dB Sound Pressure Level (SPL) and the 50% speech reception threshold: I40 and SRT50 respectively. Correlations between ESC and either I40 or SRT50 were assessed. A total of 36 adults (mean age: 50 years) with more than 11 months (mean: 34 months) of CI experience were included. In the 21 subjects for whom all electrodes were active, ESC was moderately correlated with both I40 (r = −0.557, p = 0.009) and SRT50 (r = 0.569, p = 0.007). The results indicate that speech perception performance is negatively affected by the ICCS. Estimates of current spread at the closest vicinity of CI electrodes and prior to any activation of auditory neurons are indispensable to better characterize the relationship between CI stimulation and auditory perception in cochlear implantees.

Keywords: cochlear implant; intra cochlear current spread; speech intelligibility; channel interaction

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MDPI and ACS Style

Joly, C.-A.; Reynard, P.; Hermann, R.; Seldran, F.; Gallego, S.; Idriss, S.; Thai-Van, H. Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users. J. Clin. Med. 2021, 10, 5819. https://doi.org/10.3390/jcm10245819

AMA Style

Joly C-A, Reynard P, Hermann R, Seldran F, Gallego S, Idriss S, Thai-Van H. Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users. Journal of Clinical Medicine. 2021; 10(24):5819. https://doi.org/10.3390/jcm10245819

Chicago/Turabian Style

Joly, Charles-Alexandre, Pierre Reynard, Ruben Hermann, Fabien Seldran, Stéphane Gallego, Samar Idriss, and Hung Thai-Van. 2021. "Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users" Journal of Clinical Medicine 10, no. 24: 5819. https://doi.org/10.3390/jcm10245819

APA Style

Joly, C.-A., Reynard, P., Hermann, R., Seldran, F., Gallego, S., Idriss, S., & Thai-Van, H. (2021). Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users. Journal of Clinical Medicine, 10(24), 5819. https://doi.org/10.3390/jcm10245819

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Intra-Cochlear Current Spread Correlates with Speech Perception in Experienced Adult Cochlear Implant Users

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