The Role of Temporal Cues in Voluntary Stream Segregation for Cochlear Implant Users

Trends in Hearing
Andreu Paredes-GallardoJeremy Marozeau

Abstract

The role of temporal cues in sequential stream segregation was investigated in cochlear implant (CI) listeners using a delay detection task composed of a sequence of bursts of pulses (B) on a single electrode interleaved with a second sequence (A) presented on the same electrode with a different pulse rate. In half of the trials, a delay was added to the last burst of the otherwise regular B sequence and the listeners were asked to detect this delay. As a jitter was added to the period between consecutive A bursts, time judgments between the A and B sequences provided an unreliable cue to perform the task. Thus, the segregation of the A and B sequences should improve performance. The pulse rate difference and the duration of the sequences were varied between trials. The performance in the detection task improved by increasing both the pulse rate differences and the sequence duration. This suggests that CI listeners can use pulse rate differences to segregate sequential sounds and that a segregated percept builds up over time. In addition, the contribution of place versus temporal cues for voluntary stream segregation was assessed by combining the results from this study with those from our previous study, where the same paradig...Continue Reading

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Citations

Jul 25, 2019·Frontiers in Computational Neuroscience·Andreu Paredes-GallardoJeremy Marozeau

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Methods Mentioned

BETA
cochlear implant
Nucleus Implant

Software Mentioned

R
lme4
lsmeans
lmerTest

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