Temporal pattern discrimination and speech recognition under electrical stimulation

Collins, Leslie M.; Wakefield, Gregory H.; Feinman, Gail

doi:10.1121/1.411279

Cited by 19 publications

(19 citation statements)

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“…However, their results were not supported by later studies [Shannon, 1989;Tyler et al, 1989]. Collins et al [1994] suggested that the limited levels of signal uncertainty inherent in the gap detection paradigm may be responsible for the lack of correlation between gap detection and speech perception. Instead, they employed stimuli that consist of sequences of tones separated by randomly generated gaps and found a significant correlation between the CI users' ability to discriminate such random temporal patterns and speech recognition test scores, suggesting that temporal cues may play a role in electric hearing.…”

Section: Previous Studies On Electric Hearingcontrasting

confidence: 54%

Acoustic and Electrical Pattern Analysis of Consonant Perceptual Cues Used by Cochlear Implant Users

Teoh

Neuburger

Svirsky³

2003

Audiol Neurotol

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It is hypothesized that for postlingually deafened adult cochlear implant (CI) users, a significant source of their perceptual performance variability is attributable to differences in their ability to discriminate the basic perceptual cues that are important in speech recognition. Previous research on ‘electric hearing’ has identified consistent perceptual cues for vowel recognition. However, the results on consonant perception by CI users are less clear. The primary purpose of this study is to present a quantitative method of evaluating potential ‘electric cues’ used by CI users in consonant identification. Since the actual input signals to the auditory periphery of CI users are electric in nature, we elected to measure the CI electric discharge patterns in addition to the original acoustic waveforms. The characteristics of the electric discharge patterns in response to intervocalic consonants were quantified and correlated with the dimensions of CI patients’ perceptual spaces, which were computed from multidimensional scaling analyses of their consonant confusion matrices. The results agree with most, but not all, commonly accepted acoustic cues used by normal-hearing listeners. The correlation findings also suggest that CI users employ different sets of ‘electric cues’ in perceiving consonants that differ in their manner of articulation. Specifically, spectral and temporal cues associated with slowly changing formant structures and transitions, and features associated with frication and high-frequency noise, are all highly correlated with the perceptual dimensions of all CI users. However, rapidly changing formant transitions, such as those present in stop consonants, did not appear to play a significant role in consonant recognition by more poorly performing CI subjects. The perceptual results were consistent with our physical findings that the SPEAK coding strategy partially degraded the rapidly changing formant transitions.

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Section: Previous Studies On Electric Hearingcontrasting

confidence: 54%

Acoustic and Electrical Pattern Analysis of Consonant Perceptual Cues Used by Cochlear Implant Users

Teoh

Neuburger

Svirsky³

2003

Audiol Neurotol

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“…On the other hand, subjects with small ASMs of DR might require other strategies such as use of special stimulus waveforms and electrode confi gurations to reduce problems of neural saturation and improve speech recognition. More complex psychophysical tasks, such as complex pattern recognition, have been shown to correlate with speech recognition [Collins et al, 1994], and these might be useful for identifying differences in cognitive ability.…”

Section: Discussionmentioning

confidence: 99%

Psychophysical Metrics and Speech Recognition in Cochlear Implant Users

Pfingst

2005

Audiol Neurotol

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Intersubject variability in perception is a prominent characteristic of people with cochlear implants. This study characterized intersubject differences using simple metrics based on psychophysical measures: maximum comfortable loudness levels (C levels) and dynamic ranges (DRs). In a group of 17 subjects, we assessed across-site variation (ASV) and across-site mean (ASM) values of C levels and DRs for bipolar (BP) and monopolar (MP) stimulation, and examined the relation of these metrics to speech recognition across subjects. Significant negative correlations with speech recognition were found for ASVs of C levels for BP stimulation; i.e., subjects with high ASVs of BP C levels had poor speech recognition. Positive correlations with speech recognition were found for ASMs of C levels and ASMs of DRs for both BP and MP stimulation; i.e., subjects with high mean C levels and large mean DRs had better speech recognition. Thus, these psychophysical metrics are effective for diagnosis of individual differences in performance of subjects with cochlear implants. Furthermore, they point to some potentially useful treatment procedures.

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“…Results of simple rhythm-based tests such as gap detection and amplitude modulations revealed fairly good rhythm perception in adult CI users [4,[6][7][8]. However, the ability to process more complex rhythmic discrimination [4,8,9] is subject to large inter-subject differences [10,11].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and determinants of music appreciation in adult CI users

Philips

Vinck

Vel

et al. 2011

Eur Arch Otorhinolaryngol

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The main objective of this study was to assess the associations between self-reported listening habits and perception of music and speech perception outcomes in quiet and noise for both unilateral cochlear implant (CI) users and bimodal (CI in one ear, hearing aid in contra-lateral ear) users. Information concerning music appreciation was gathered by means of a newly developed questionnaire. Moreover, audiological data (pure-tone audiometry, speech tests in noise and quiet) were gathered and the relationship between speech perception and music appreciation is studied. Bimodal users enjoy listening to music more in comparison with unilateral CI users. Also, music training within rehabilitation is still uncommon, while CI recipients believe that music training might be helpful to maximize their potential with current CI technology. Music training should not be exclusively reserved for the good speech performers. Therefore, a music training program (MTP) that consists of different difficulty levels should be developed. Hopefully, early implementation of MTP in rehabilitation programs can enable adult CI users to enjoy and appreciate music and to maximize their potential with commercially available technology. Furthermore, because bimodal users consider the bimodal stimulation to be the most enjoyable way to listen to music, CI users with residual hearing in the contra-lateral ear should be encouraged to continue wearing their hearing aid in that ear.

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Temporal pattern discrimination and speech recognition under electrical stimulation

Cited by 19 publications

References 0 publications

Acoustic and Electrical Pattern Analysis of Consonant Perceptual Cues Used by Cochlear Implant Users

Acoustic and Electrical Pattern Analysis of Consonant Perceptual Cues Used by Cochlear Implant Users

Psychophysical Metrics and Speech Recognition in Cochlear Implant Users

Characteristics and determinants of music appreciation in adult CI users

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