Evidence of across-channel processing for spectral-ripple discrimination in cochlear implant listeners

Won, Jong Ho; Jones, Gary L.; Drennan, Ward R.; Jameyson, Elyse; Rubinstein, Jay T.

doi:10.1121/1.3624820

Cited by 29 publications

(26 citation statements)

References 26 publications

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“…Several investigators have addressed these concerns and found that potentially confounding factors (edge effects and intensity cues) are likely minimal (e.g., Anderson et al 2011; Won et al 2011c). The significant correlations between measures of spatial selectivity and spectral ripple discrimination (Anderson et al 2011; Jones et al 2013, this study) and the large r 2 values (Jones: r 2 = 0.94; this study: r 2 =0.87) suggest that confounding factors are likely minimal.…”

Section: Discussionmentioning

confidence: 99%

“…The general design of this study was modeled after that of Won and colleagues (2011c) and involved manipulating the CI processor settings, or MAPs, to effectively change spatial/spectral selectivity within individual CI users. Three experimental MAPs were created, each using 7 of the available 22 intracochlear electrodes.…”

Section: Methodsmentioning

confidence: 99%

“…Measures of spectral selectivity (spectral ACC) and speech perception (vowel discrimination and sentences within background babble) were repeated for each participant/MAP. In contrast to Won and colleagues (2011c), this study also included measures of spatial selectivity for each participant/MAP, specifically, the peripheral (ECAP) and central (ACC) measures of spatial selectivity reported in the companion paper (Scheperle & Abbas submitted). …”

Section: Methodsmentioning

confidence: 99%

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Relationships Among Peripheral and Central Electrophysiological Measures of Spatial and Spectral Selectivity and Speech Perception in Cochlear Implant Users

Scheperle

Abbas

2015

Ear &Amp; Hearing

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Objectives The ability to perceive speech is related to the listener’s ability to differentiate among frequencies (i.e., spectral resolution). Cochlear implant (CI) users exhibit variable speech-perception and spectral-resolution abilities, which can be attributed in part to the extent of electrode interactions at the periphery (i.e., spatial selectivity). However, electrophysiological measures of peripheral spatial selectivity have not been found to correlate with speech perception. The purpose of this study was to evaluate auditory processing at the periphery and cortex using both simple and spectrally complex stimuli to better understand the stages of neural processing underlying speech perception. The hypotheses were that (1) by more completely characterizing peripheral excitation patterns than in previous studies, significant correlations with measures of spectral selectivity and speech perception would be observed, (2) adding information about processing at a level central to the auditory nerve would account for additional variability in speech perception, and (3) responses elicited with spectrally complex stimuli would be more strongly correlated with speech perception than responses elicited with spectrally simple stimuli. Design Eleven adult CI users participated. Three experimental processor programs (MAPs) were created to vary the likelihood of electrode interactions within each participant. For each MAP, a subset of 7 of 22 intracochlear electrodes was activated: adjacent (MAP 1), every-other (MAP 2), or every third (MAP 3). Peripheral spatial selectivity was assessed using the electrically evoked compound action potential (ECAP) to obtain channel-interaction functions for all activated electrodes (13 functions total). Central processing was assessed by eliciting the auditory change complex (ACC) with both spatial (electrode pairs) and spectral (rippled noise) stimulus changes. Speech-perception measures included vowel-discrimination and the Bamford-Kowal-Bench Sentence-in-Noise (BKB-SIN) test. Spatial and spectral selectivity and speech perception were expected to be poorest with MAP 1 (closest electrode spacing) and best with MAP 3 (widest electrode spacing). Relationships among the electrophysiological and speech-perception measures were evaluated using mixed-model and simple linear regression analyses. Results All electrophysiological measures were significantly correlated with each other and with speech perception for the mixed-model analysis, which takes into account multiple measures per person (i.e. experimental MAPs). The ECAP measures were the best predictor of speech perception. In the simple linear regression analysis on MAP 3 data, only the cortical measures were significantly correlated with speech; spectral ACC amplitude was the strongest predictor. Conclusions The results suggest that both peripheral and central electrophysiological measures of spatial and spectral selectivity provide valuable information about speech perception. Clinically, it is often desirable to optimize pe...

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Relationships Among Peripheral and Central Electrophysiological Measures of Spatial and Spectral Selectivity and Speech Perception in Cochlear Implant Users

Scheperle

Abbas

2015

Ear &Amp; Hearing

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“…The threshold was taken as the mean ripple density visited of the last 8 of 13 reversals. Performance is related to behavioral and objective channel interactions (Jones et al 2013b; Scheperle and Abbas 2015; Won et al 2014a), correlated with behavioral tuning curve measures (Anderson et al 2011), and not dependent upon level differences at the edge of the stimuli nor on the spectral centroid of the stimuli (Jones et al 2013b; Won et al 2011b). …”

Section: Methodsmentioning

confidence: 99%

“…This ability correlates with speech understanding ability in CI users in quiet and in noise (Henry et al 2003; Won et al 2007) and across a range of hearing impairments (Henry et al 2005). The test has been shown by multiple studies to be closely related to channel interaction and is clearly spectral in nature (Jones et al 2013a; Scheperle et al 2015; Won et al 2014a; Won et al 2011b). Related tests of spectral-ripple detection have also shown strong correlations with speech performance (Gifford et al 2014; Litvak et al 2007; Saoji et al 2009; Spahr et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Nonlinguistic Outcome Measures in Adult Cochlear Implant Users Over the First Year of Implantation

Drennan

Won

Timme³

et al. 2016

Ear &Amp; Hearing

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Objectives Post-lingually deaf cochlear implant users’ speech perception improves over several months after implantation due to a learning process which involves integration of the new acoustic information presented by the device. Basic tests of hearing acuity might evaluate sensitivity to the new acoustic information and be less sensitive to learning effects. It was hypothesized that, unlike speech perception, basic spectral and temporal discrimination abilities will not change over the first year of implant use. If there were limited change over time and the test scores were correlated with clinical outcome, the tests might be useful for acute diagnostic assessments of hearing ability and also useful for testing speakers of any language, many of which do not have validated speech tests. Design Ten newly implanted cochlear implant users were tested for speech understanding in quiet and in noise at 1 and 12 months post activation. Spectral-ripple discrimination, temporal-modulation detection, and Schroeder-phase discrimination abilities were evaluated at 1, 3, 6, 9 and 12 months post activation. Results Speech understanding in quiet improved between 1 and 12 months post activation (mean 8% improvement). Speech in noise performance showed no statistically significant improvement. Mean spectral-ripple discrimination thresholds and temporal-modulation detection thresholds for modulation frequencies of 100 Hz and above also showed no significant improvement. Spectral-ripple discrimination thresholds were significantly correlated with speech understanding. Low frequency modulation detection and Schroeder-phase discrimination abilities improved over the period. Individual learning trends varied, but the majority of listeners followed the same stable pattern as group data. Conclusions Spectral-ripple discrimination ability and temporal-modulation detection at 100-Hz modulation and above might serve as a useful diagnostic tool for early acute assessment of cochlear implant outcome for listeners speaking any native language.

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Spectral and Temporal Analysis of Simulated Dead Regions in Cochlear Implants

Won

Jones

Moon

et al. 2015

JARO

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A cochlear implant (CI) electrode in a Bcochlear dead region^will excite neighboring neural populations. In previous research that simulated such dead regions, stimulus information in the simulated dead region was either added to the immediately adjacent frequency regions or dropped entirely. There was little difference in speech perception ability between the two conditions. This may imply that there may be little benefit of ensuring that stimulus information on an electrode in a suspected cochlear dead region is transmitted. Alternatively, performance may be enhanced by a broader frequency redistribution, rather than adding stimuli from the dead region to the edges. In the current experiments, cochlear dead regions were introduced by excluding selected CI electrodes or vocoder noise-bands. Participants were assessed for speech understanding as well as spectral and temporal sensitivities as a function of the size of simulated dead regions. In one set of tests, the normal input frequency range of the sound processor was distributed among the active electrodes in bands with approximately logarithmic spacing (Bredistributedm aps); in the remaining tests, information in simulated dead regions was dropped (Bdropped^maps). Word recognition and Schroeder-phase discrimination performance, which require both spectral and temporal sensitivities, decreased as the size of simulated dead regions increased, but the redistributed and dropped remappings showed similar performance in these two tasks. Psychoacoustic experiments showed that the near match in word scores may reflect a tradeoff between spectral and temporal sensitivity: spectral-ripple discrimination was substantially degraded in the redistributed condition relative to the dropped condition while performance in a temporal modulation detection task degraded in the dropped condition but remained constant in the redistributed condition.

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Evidence of across-channel processing for spectral-ripple discrimination in cochlear implant listeners

Cited by 29 publications

References 26 publications

Relationships Among Peripheral and Central Electrophysiological Measures of Spatial and Spectral Selectivity and Speech Perception in Cochlear Implant Users

Relationships Among Peripheral and Central Electrophysiological Measures of Spatial and Spectral Selectivity and Speech Perception in Cochlear Implant Users

Nonlinguistic Outcome Measures in Adult Cochlear Implant Users Over the First Year of Implantation

Spectral and Temporal Analysis of Simulated Dead Regions in Cochlear Implants

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