Cortical reorganization after cochlear implantation for adults with single-sided deafness

Legris, E.; Galvin, John J.; Roux, Sylvie; Gomot, Marie; Aoustin, Jean-Marie; Marx, Mathieu; He, Shuman; Bakhos, D.

doi:10.1371/journal.pone.0204402

Cited by 28 publications

(36 citation statements)

References 69 publications

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“…Previous studies support our results which show a strong correlation between CAEP latencies and speech perception scores [46]. Legris et al (2018) recorded cortical changes from nine SSD individuals who had received a CI, using a loud speaker to present a /ba/ sound simultaneously to the normal hearing ear and CI, this was then compared to a normal hearing cohort. They observed increased bilateral cortical activation which, coupled with an improvement in functional speech in noise testing, may indicate the restoration of binaural cortical function [47].…”

Section: Fig 1 Bamford-kowol-bench Speech-in-noise Test Results For supporting

confidence: 88%

“…Legris et al (2018) recorded cortical changes from nine SSD individuals who had received a CI, using a loud speaker to present a /ba/ sound simultaneously to the normal hearing ear and CI, this was then compared to a normal hearing cohort. They observed increased bilateral cortical activation which, coupled with an improvement in functional speech in noise testing, may indicate the restoration of binaural cortical function [47]. Cortical responses obtained from the CI in this study further support these findings, coupled with the improvement in speech in noise and localisation.…”

Section: Fig 1 Bamford-kowol-bench Speech-in-noise Test Results For mentioning

confidence: 99%

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Restoration of cortical symmetry and binaural function: Cortical auditory evoked responses in adult cochlear implant users with single sided deafness

et al. 2020

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BackgroundCochlear implantation for single-sided deafness (SSD) is the only treatment option with the potential to restore binaural hearing cues. Significant binaural benefit has been measured in adults by speech in noise and localisation tests, who receive a cochlear implant for SSD, however, little is known on the cortical changes that help provide this benefit. In the present study, detection of sound in the auditory cortex, speech testing and localisation was used to investigate the ability of a cochlear implant (CI) to restore auditory cortical latencies and improve binaural benefit in the adult SSD population. OPEN ACCESS Citation: Wedekind A, Rajan G, Van Dun B, Távora-Vieira D (2020) Restoration of cortical symmetry and binaural function: Cortical auditory evoked responses in adult cochlear implant users with single sided deafness. PLoS ONE 15(1): e0227371. ConclusionCortical auditory evoked response latencies recorded from the CI and NHe showed no significant difference, indicating that the detection of sound in the auditory cortex occurred simultaneously, providing the cortex with auditory information for binaural hearing.

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Section: Fig 1 Bamford-kowol-bench Speech-in-noise Test Results For supporting

confidence: 88%

Section: Fig 1 Bamford-kowol-bench Speech-in-noise Test Results For mentioning

confidence: 99%

Restoration of cortical symmetry and binaural function: Cortical auditory evoked responses in adult cochlear implant users with single sided deafness

et al. 2020

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“…A related reason for repeated measurements is the observed heterogeneity of hearing-impaired individuals' etiology and time course of hearing impairment, the associated deficits, and CI outcome. To date, only a few studies have investigated changes in sensory processing associated with CI experience (26,(70)(71)(72), while longitudinal studies of later potentials are missing altogether.…”

Section: Importance Of Longitudinal Studiesmentioning

confidence: 99%

“…Only one study (71) also used sound field acoustic presentation and binaural listening conditions, although participants in this study suffered from single-sided deafness (SSD). Legris et al (71) probed binaural hearing before and up to 12 months postimplantation with stimuli presented at a constant sound pressure level for all assessments. An increase, although not statistically significant, was seen for the N1 amplitude, but only for CIs implanted on the left side.…”

Section: Importance Of Longitudinal Studiesmentioning

confidence: 99%

Changes in Speech-Related Brain Activity During Adaptation to Electro-Acoustic Hearing

et al. 2020

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Objectives: Hearing improves significantly with bimodal provision, i.e., a cochlear implant (CI) at one ear and a hearing aid (HA) at the other, but performance shows a high degree of variability resulting in substantial uncertainty about the performance that can be expected by the individual CI user. The objective of this study was to explore how auditory event-related potentials (AERPs) of bimodal listeners in response to spoken words approximate the electrophysiological response of normal hearing (NH) listeners. Study Design: Explorative prospective analysis during the first 6 months of bimodal listening using a within-subject repeated measures design. Setting: Academic tertiary care center. Participants: Twenty-seven adult participants with bilateral sensorineural hearing loss who received a HiRes 90K CI and continued use of a HA at the non-implanted ear. Age-matched NH listeners served as controls. Intervention: Cochlear implantation. Main Outcome Measures: Obligatory auditory evoked potentials N1 and P2, and the event-related N2 potential in response to monosyllabic words and their reversed sound traces before, as well as 3 and 6 months post-implantation. The task required word/nonword classification. Stimuli were presented within speech-modulated noise. Loudness of word/non-word signals was adjusted individually to achieve the same intelligibility across groups and assessments. Results: Intelligibility improved significantly with bimodal hearing, and the N1-P2 response approximated the morphology seen in NH with enhanced and earlier responses to the words compared to their reversals. For bimodal listeners, a prominent negative deflection was present between 370 and 570 ms post stimulus onset (N2), irrespective of stimulus type. This was absent for NH controls; hence, this response did not approximate the NH response during the study interval. N2 source localization evidenced extended activation of general cognitive areas in frontal and prefrontal brain areas in the CI group. Balkenhol et al. Adaptation to Electro-Acoustic Hearing Conclusions: Prolonged and spatially extended processing in bimodal CI users suggests employment of additional auditory-cognitive mechanisms during speech processing. This does not reduce within 6 months of bimodal experience and may be a correlate of the enhanced listening effort described by CI listeners.

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“…It is considered that these two factors are associated with each other. In addition, Legaris et al reported that cortical reorganization and restoration of binaural function in the brain might be produced after 1 year of experience with CI in adult SSD patients by evaluation of cortical auditory evoked potential changes [20].…”

Section: Cochlear Implantmentioning

confidence: 99%

Associated Health Issues of Patients with Acquired Unilateral Hearing Loss

Sano¹

2020

Advances in Rehabilitation of Hearing Loss

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Patients with unilateral hearing loss have impaired hearing of sounds coming from the affected side, decreased comprehension of speech in noisy environments, and lack of sound localization. There are many conditions that can induce unilateral hearing loss, but idiopathic sudden sensorineural hearing loss (ISSHL) is thought to be most notable because of its high incidence. Patients with ISSHL suddenly acquire unilateral hearing loss; therefore, there are additional significant health problems that complicate the abovementioned symptoms due to the characteristic clinical course of ISSHL including hearing-related discomfort, tinnitus, and anxiety. It has been reported that hearing-related discomfort is closely associated with patients' quality of life. In this chapter, the associated health issues of patients with ISSHL are described, and the interventions employed for patients with unilateral hearing loss are evaluated for their potential in improving the lives of ISSHL patients.

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Cortical reorganization after cochlear implantation for adults with single-sided deafness

Cited by 28 publications

References 69 publications

Restoration of cortical symmetry and binaural function: Cortical auditory evoked responses in adult cochlear implant users with single sided deafness

Restoration of cortical symmetry and binaural function: Cortical auditory evoked responses in adult cochlear implant users with single sided deafness

Changes in Speech-Related Brain Activity During Adaptation to Electro-Acoustic Hearing

Associated Health Issues of Patients with Acquired Unilateral Hearing Loss

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