Training improves cochlear implant rate discrimination on a psychophysical task

Goldsworthy, Raymond L.; Shannon, Robert V.

doi:10.1121/1.4835735

Cited by 29 publications

(33 citation statements)

References 36 publications

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“…It is unclear which factors determine the ability to exploit ITDs at high modulation frequencies, although it appears that some listening experience is necessary, although not sufficient, to generate high performance or low thresholds. Note that Goldsworthy and Shannon (2014) found that 32 hr of training improved rate difference limens in CI listeners by a factor of two, suggesting that training in the task might be an important factor. One limitation for correct lateralization with increasing modulation rate is that the limiting value of half the period of the modulation will start to encroach on the range of potential ITD thresholds.…”

Section: Discussionmentioning

confidence: 94%

Sensitivity to Envelope Interaural Time Differences at High Modulation Rates

2015

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Sensitivity to interaural time differences (ITDs) conveyed in the temporal fine structure of low-frequency tones and the modulated envelopes of high-frequency sounds are considered comparable, particularly for envelopes shaped to transmit similar fidelity of temporal information normally present for low-frequency sounds. Nevertheless, discrimination performance for envelope modulation rates above a few hundred Hertz is reported to be poor—to the point of discrimination thresholds being unattainable—compared with the much higher (>1,000 Hz) limit for low-frequency ITD sensitivity, suggesting the presence of a low-pass filter in the envelope domain. Further, performance for identical modulation rates appears to decline with increasing carrier frequency, supporting the view that the low-pass characteristics observed for envelope ITD processing is carrier-frequency dependent. Here, we assessed listeners’ sensitivity to ITDs conveyed in pure tones and in the modulated envelopes of high-frequency tones. ITD discrimination for the modulated high-frequency tones was measured as a function of both modulation rate and carrier frequency. Some well-trained listeners appear able to discriminate ITDs extremely well, even at modulation rates well beyond 500 Hz, for 4-kHz carriers. For one listener, thresholds were even obtained for a modulation rate of 800 Hz. The highest modulation rate for which thresholds could be obtained declined with increasing carrier frequency for all listeners. At 10 kHz, the highest modulation rate at which thresholds could be obtained was 600 Hz. The upper limit of sensitivity to ITDs conveyed in the envelope of high-frequency modulated sounds appears to be higher than previously considered.

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Section: Discussionmentioning

confidence: 94%

Sensitivity to Envelope Interaural Time Differences at High Modulation Rates

2015

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“…The advent of relatively inexpensive personal computers has made it possible to automate many common training routines, making computerized training a practical, low-cost approach for improving patient auditory perception (Henshaw & Ferguson, 2013;Pizarek, Shafiro, & McCarthy, 2013). A number of training programs, targeting different aspects of auditory perception and cognitive processing, have been tested with CI patients (Dawson & Clark, 1997;Fu & Galvin, 2007;Gfeller, Witt, Kim, Adamek, & Coffman, 1999;Goldsworthy & Shannon, 2014;Ingvalson, Lee, Fiebig, & Wong, 2013;Miller, Watson, Kistler, Wightman, & Preminger, 2008;Oba, Fu, & Galvin, 2011;Stacey et al, 2010;Wu, Yang, Lin, & Fu, 2007;Zhang, Dorman, Fu, & Spahr, 2012). Training studies with CI patients differ considerably in terms of study design, training regimens, materials, and outcome measures.…”

Section: Computerized Training In Cochlear Implant Rehabilitationmentioning

confidence: 99%

Environmental Sound Training in Cochlear Implant Users

Shafiro

Sheft

Kuvadia

et al. 2015

J Speech Lang Hear Res

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Purpose The study investigated the effect of a short computer-based environmental sound training regimen on the perception of environmental sounds and speech in experienced cochlear implant (CI) patients. Method Fourteen CI patients with the average of 5 years of CI experience participated. The protocol consisted of 2 pretests, 1 week apart, followed by 4 environmental sound training sessions conducted on separate days in 1 week, and concluded with 2 posttest sessions, separated by another week without training. Each testing session included an environmental sound test, which consisted of 40 familiar everyday sounds, each represented by 4 different tokens, as well as the Consonant Nucleus Consonant (CNC) word test, and Revised Speech Perception in Noise (SPIN-R) sentence test. Results Environmental sounds scores were lower than for either of the speech tests. Following training, there was a significant average improvement of 15.8 points in environmental sound perception, which persisted 1 week later after training was discontinued. No significant improvements were observed for either speech test. Conclusions The findings demonstrate that environmental sound perception, which remains problematic even for experienced CI patients, can be improved with a home-based computer training regimen. Such computer-based training may thus provide an effective low-cost approach to rehabilitation for CI users, and potentially, other hearing impaired populations.

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“…This suggests that at high rates, pitch was not a reliable explanation for the perceptual differences between higher rates of stimulation. Nevertheless, Goldsworthy and Shannon (2014) were able to train listeners to pitch rank higher rates of stimulation (up to 3520 Hz) correctly. Further study is needed to understand the perceptual changes produced by a change in carrier rate.…”

Section: Experiments 2b—sound Quality Scaling Of Analog and Amp Stimulmentioning

confidence: 91%

Perceptual Differences Between Low-Frequency Analog and Pulsatile Stimulation as Shown by Single- and Multidimensional Scaling

et al. 2018

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Cochlear-implant users who have experienced both analog and pulsatile sound coding strategies often have strong preferences for the sound quality of one over the other. This suggests that analog and pulsatile stimulation may provide different information or sound quality to an implant listener. It has been well documented that many implant listeners both prefer and perform better with multichannel analog than multichannel pulsatile strategies, although the reasons for these differences remain unknown. Here, we examine the perceptual differences between analog and pulsatile stimulation on a single electrode. A multidimensional scaling task, analyzed across two dimensions, suggested that pulsatile stimulation was perceived to be considerably different from analog stimulation. Two associated tasks using single-dimensional scaling showed that analog stimulation was perceived to be less Clean on average than pulsatile stimulation and that the perceptual differences were not related to pitch. In a follow-up experiment, it was determined that the perceptual differences between analog and pulsatile stimulation were not dependent on the interpulse gap present in pulsatile stimulation. Although the results suggest that there is a large perceptual difference between analog and pulsatile stimulation, further work is needed to determine the nature of these differences.

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Training improves cochlear implant rate discrimination on a psychophysical task

Cited by 29 publications

References 36 publications

Sensitivity to Envelope Interaural Time Differences at High Modulation Rates

Sensitivity to Envelope Interaural Time Differences at High Modulation Rates

Environmental Sound Training in Cochlear Implant Users

Perceptual Differences Between Low-Frequency Analog and Pulsatile Stimulation as Shown by Single- and Multidimensional Scaling

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