Effects of electrode configuration and frequency allocation on vowel recognition with the Nucleus-22 cochlear implant.
Objective: This study was conducted to understand vowel recognition in cochlear implants as a function of the cochlear location and separation of the stimulated electrode pairs and as a function of the matching between speech spectral information and the location of the stimulated electrodes.Design:...
| Publicado en: | Ear & Hearing (01960202) Vol. 20; no. 4; pp. 332 - 345 |
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| Autores principales: | , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Lippincott Williams & Wilkins
1999 Aug
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=107089587&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 107089587 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01960202 IM7 jtl: Ear & Hearing (01960202) issn: 01960202 maglogo: N pubinfo: dt: 1999 Aug vid: 20 iid: 4 pid: 433 pub: Lippincott Williams & Wilkins place: Baltimore, Maryland artinfo: ui: 107089587 107089587 NLM10466569 2000008764 NLM10466569 107089587 ppf: 332 ppct: 13 formats: tig: atl: Effects of electrode configuration and frequency allocation on vowel recognition with the Nucleus-22 cochlear implant. aug: au: Fu Q Shannon RV Fu, Q J Shannon, R V affil: Department of Auditory Implants and Perception, House Ear Institute, Los Angeles, California 90057, USA sug: subj: Cochlear Implant Speech Perception Funding Source Speech Discrimination Tests Signal Processing, Computer Assisted Phonetics Repeated Measures Analysis of Variance Age Factors Sex Factors Male Female Adult Middle Age Aged Human Adult: 19-44 years Middle Aged: 45-64 years Aged: 65+ years Male Female ab: Objective: This study was conducted to understand vowel recognition in cochlear implants as a function of the cochlear location and separation of the stimulated electrode pairs and as a function of the matching between speech spectral information and the location of the stimulated electrodes.Design: Four-electrode speech processors with a continuous interleaved sampling speech processing strategy were implemented through a custom interface in five subjects implanted with the Nucleus-22 cochlear implant. The temporal envelopes from four broad frequency bands were used to modulate 500 pps, 100 microsec/phase interleaved pulse trains delivered to four electrode pairs. Ten different frequency allocations and five sets of four-electrode configurations were tested. Each frequency allocation represented the same cochlear extent but different cochlear locations based on Greenwood's frequency-to-place formula. Recognition of multi-talker medial vowels was measured for each combination of parameters with no period of practice or adjustment.Results: Results showed that recognition of multi-talker vowels was highly dependent on frequency allocation for all electrode configurations. For a given electrode configuration maximum vowel recognition was observed with a specific frequency allocation. When the stimulated electrodes were shifted basally by 3 mm, the frequency allocation that produced the best performance also shifted basally by 3 mm. A similar pattern of vowel recognition was observed as a function of frequency allocation for electrode configurations that had the same apical-most electrode in each pair, regardless of location of the basal-most electrode in the pair. Subjects with different electrode insertion depths had similar trends in vowel recognition for each frequency allocation.Conclusions: For a given electrode configuration, the best performance was obtained with processors with a specific frequency allocation. In addition, the apical-most member of each electrode pair had a much stronger influence on vowel recognition in electric hearing. Finally, results from this study also suggest that over time, patients with implants can partially adapt to a basal shift in place of stimulation. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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