Assessment and Outcome in Non-Traditional Cochlear Implant Candidates

Heywood, Rebecca; Vickers, Deborah; Pinto, Francesca; Fereos, George; Shaida, Azhar

doi:10.1159/000454914

Cited by 14 publications

(17 citation statements)

References 18 publications

(30 reference statements)

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“…Electrode discrimination ability continued to improve for up to 12 months after switch-on in certain individuals. While it is known that speech perception in CI users may improve for many years (Heywood et al, 2016;Tyler et al, 1997) The data suggest that the improvements over time were not just due to task related learning for two reasons. Firstly, the improvements in behavioural scores over the first 6 months were paralleled by an increase in the mean spatial ACC amplitude.…”

Section: Changes In Electrode Discrimination Over Timementioning

confidence: 93%

Development of electrophysiological and behavioural measures of electrode discrimination in adult cochlear implant users

Mathew

Vickers²,

Boyle³

et al. 2018

Hearing Research

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The plasticity of the auditory system enables it to adjust to electrical stimulation from cochlear implants (CI). Whilst speech perception may develop for many years after implant activation, very little is known about the changes in auditory processing that underpin these improvements. Such an understanding could help guide interventions that improve hearing performance. In this longitudinal study, we examine how electrode discrimination ability changes over time in newly implanted adult CI users. Electrode discrimination was measured with a behavioural task as well as the spatial auditory change complex (ACC), which is a cortical response to a change in place of stimulation. We show that there was significant improvement in electrode discrimination ability over time, though in certain individuals the process of accommodation was slower and more limited. We found a strong relationship between objective and behavioural measures of electrode discrimination using pass-fail rules. In several cases, the development of the spatial ACC preceded accurate behavioural discrimination. These data provide evidence for plasticity of auditory processing in adult CI users. Behavioural electrode discrimination score but not spatial ACC amplitude was found to be a significant predictor of speech perception. We suggest that it would be beneficial to measure electrode discrimination in CI users and that interventions that exploit the plastic capacity of the auditory system to improve basic auditory processing, could be used to optimize performance in CI users.

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Section: Changes In Electrode Discrimination Over Timementioning

confidence: 93%

Development of electrophysiological and behavioural measures of electrode discrimination in adult cochlear implant users

Mathew

Vickers²,

Boyle³

et al. 2018

Hearing Research

Self Cite

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“…In this study, we focus on a relatively new and less typical group of CI users; the early-deafened, late-implanted (EDLI) CI user. EDLI CI users are deafened during language acquisition (defined as deafness onset between 0 and 6 years in this study, based on literature), and only implanted after a longer period of auditory deprivation (implantation at or older than 16 years of age in this study, translating to at least 10 years of auditory deprivation) (Goorhuis-Brouwer and Schaerlaekens, 2000; van Dijkhuizen et al, 2011; Fuller et al, 2013; Heywood et al, 2016). The perception and appreciation of music in this EDLI CI group is mostly unknown.…”

Section: Introductionmentioning

confidence: 99%

Early Deafened, Late Implanted Cochlear Implant Users Appreciate Music More Than and Identify Music as Well as Postlingual Users

2019

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Introduction: Typical cochlear implant (CI) users, namely postlingually deafened and implanted, report to not enjoy listening to music, and find it difficult to perceive music. Another group of CI users, the early-deafened (during language acquisition) and late-implanted (after a long period of auditory deprivation; EDLI), report a higher music appreciation, but is this related to a better music perception?Materials and Methods: Sixteen EDLI and fifteen postlingually deafened (control group) CI users participated in the study. The inclusion criteria for EDLI were: severe or profound hearing loss onset before the age of 6 years, implantation after the age of 16 years, and CI experience more than 1 year. Subjectively, music perception and appreciation was evaluated using the Dutch Musical Background Questionnaire. Behaviorally, music perception was measured with melodic contour identification (MCI), using two instruments (piano and organ), each tested with and without a masking contour. Semitone distance between successive tones of the target varied from 1 to 3 semitones.Results: Subjectively, the EDLI group reported to appreciate music more than postlingually deafened CI users. Behaviorally, while clinical phoneme recognition test score on average was lower in the EDLI group, melodic contour identification did not significantly differ between the two groups. There was, however, an effect of instrument and masker for both groups; the piano was the best-recognized instrument, and for both instruments, the masker with non-overlapping pitch was best recognized.Discussion: EDLI group reported higher appreciation of music than postlingual control group, even though behaviorally measured music perception did not differ significantly between the two groups. Both surprising findings since EDLI CI users would be expected to have lower outcomes based on the early deafness onset, long duration of auditory deprivation, and on average lower clinical speech scores. Perhaps, the music perception difficulty comes from similar electric hearing limitations in both groups. The higher subjective appreciation in EDLI might be due to the lack of a musical memory, with no ability to compare music heard via the CI to acoustic music perception. Overall, our findings support a benefit from implantation for a positive music experience in EDLI CI users.

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“…These same outcome measures are also used in CI research (e.g. Vickers et al 2009;Heywood et al 2016). Such behavioural measures cannot be used with infants or with some children and adults with additional needs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Speech-ABRs in cochlear implant recipients: feasibility study

BinKhamis

Perugia

O’Driscoll

et al. 2019

International Journal of Audiology

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Objective: The aim of this study was to assess the feasibility of recording speech-ABRs from cochlear implant (CI) recipients, and to remove the artefact using a clinically applicable single-channel approach. Design: Speech-ABRs were recorded to a 40 ms [da] presented via loudspeaker using a two-channel electrode montage. Additionally, artefacts were recorded using an artificial-head incorporating a MED-EL CI with stimulation parameters as similar as possible to those of three MED-EL participants. A single-channel artefact removal technique was applied to all responses. Study sample: A total of 12 adult CI recipients (6 Cochlear Nucleus and 6 MED-EL CIs). Results: Responses differed according to the CI type, artefact removal resulted in responses containing speech-ARB characteristics in two MED-EL CI participants; however, it was not possible to verify whether these were true responses or were modulated by artefacts, and artefact removal was successful from the artificial-head recordings. Conclusions: This is the first study that attempted to record speech-ABRs from CI recipients. Results suggest that there is a potential for application of a single-channel approach to artefact removal. However, a more robust and adaptive approach to artefact removal that includes a method to verify true responses is needed.

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Assessment and Outcome in Non-Traditional Cochlear Implant Candidates

Cited by 14 publications

References 18 publications

Development of electrophysiological and behavioural measures of electrode discrimination in adult cochlear implant users

Development of electrophysiological and behavioural measures of electrode discrimination in adult cochlear implant users

Early Deafened, Late Implanted Cochlear Implant Users Appreciate Music More Than and Identify Music as Well as Postlingual Users

Speech-ABRs in cochlear implant recipients: feasibility study

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