Evaluation of a cochlear-implant processing strategy incorporating phantom stimulation and asymmetric pulses.
Objective: To evaluate a speech-processing strategy in which the lowest frequency channel is conveyed using an asymmetric pulse shape and 'phantom stimulation', where current is injected into one intra-cochlear electrode and where the return current is shared between an intra-cochlear and an extra-c...
| Published in: | International Journal of Audiology Vol. 53; no. 12; pp. 871 - 880 |
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| Main Authors: | , , , |
| Format: | research tables/charts Journal Article |
| Published: |
Taylor & Francis Ltd
Dec2014
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=103767361&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 103767361 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14992027 JW2 jtl: International Journal of Audiology issn: 14992027 maglogo: Y pubinfo: dt: Dec2014 vid: 53 iid: 12 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 103767361 101301149 10.3109/14992027.2014.932024 NLM25358027 PMC4266076 103767361 ppf: 871 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Evaluation of a cochlear-implant processing strategy incorporating phantom stimulation and asymmetric pulses. aug: au: Carlyon, Robert P. Monstrey, Jolijn Deeks, John M. Macherey, Olivier affil: MRC Cognition & Brain Sciences Unit, Cambridge, UK sug: subj: Cochlear Implant Acoustic Stimulation Speech Perception Evaluation Human Funding Source Aged Middle Age Adult Phonation Analysis of Variance Male Female Aged: 65+ years Middle Aged: 45-64 years Adult: 19-44 years Male Female ab: Objective: To evaluate a speech-processing strategy in which the lowest frequency channel is conveyed using an asymmetric pulse shape and 'phantom stimulation', where current is injected into one intra-cochlear electrode and where the return current is shared between an intra-cochlear and an extra-cochlear electrode. This strategy is expected to provide more selective excitation of the cochlear apex, compared to a standard strategy where the lowest-frequency channel is conveyed by symmetric pulses in monopolar mode. In both strategies all other channels were conveyed by monopolar stimulation. Design: Within-subjects comparison between the two strategies. Four experiments: (1) discrimination between the strategies, controlling for loudness differences, (2) consonant identification, (3) recognition of lowpass-filtered sentences in quiet, (4) sentence recognition in the presence of a competing speaker. Study sample: Eight users of the Advanced Bionics CII/Hi-Res 90k cochlear implant. Results: Listeners could easily discriminate between the two strategies but no consistent differences in performance were observed. Conclusions: The proposed method does not improve speech perception, at least in the short term. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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