scholarly journals Sensitivity to pulse phase duration in cochlear implant listeners: Effects of stimulation mode

2014 ◽  
Vol 136 (2) ◽  
pp. 829-840 ◽  
Author(s):  
Monita Chatterjee ◽  
Aditya M. Kulkarni
Keyword(s):  
Cochlear Implant ◽  
Phase Duration ◽  
Stimulation Mode ◽  
Pulse Phase

scholarly journals Effect of pulse phase duration on forward masking and spread of excitation in cochlear implant listeners

PLoS ONE ◽  
2020 ◽  
Vol 15 (7) ◽  
pp. e0236179
Author(s):  
Ning Zhou ◽  
Zhen Zhu ◽  
Lixue Dong ◽  
John J. Galvin
Keyword(s):  
Cochlear Implant ◽  
Forward Masking ◽  
Phase Duration ◽  
Pulse Phase ◽  
Spread Of Excitation

scholarly journals Sensitivity to Pulse Phase Duration as a Marker of Neural Health Across Cochlear Implant Recipients and Electrodes

2021 ◽  
Author(s):  
Ning Zhou ◽  
Zhen Zhu ◽  
Lixue Dong ◽  
John Galvin
Keyword(s):  
Hearing Loss ◽  
Speech Recognition ◽  
Cochlear Implant ◽  
Dynamic Range ◽  
Recognition Performance ◽  
Phase Duration ◽  
Pulse Phase ◽  
Site Variation ◽  
Integration Efficiency ◽  
Charge Integration

AbstractIn cochlear implants, loudness has been shown to grow more slowly with increasing pulse phase duration (PPD) than with pulse amplitude (PA), possibly due to “leaky” charge integration. This leakiness has been recently quantified in terms of “charge integration efficiency,” defined as the log difference between the PPD dynamic range and PA dynamic range (both expressed in charge units), relative to a common threshold anchor. Such leakiness may differ across electrodes and/or test ears, and may reflect underlying neural health. In this study, we examined the across-site variation of charge integration in recipients of Cochlear© devices. PPD and PA dynamic ranges were measured relative to two threshold anchors with either a 25- or 50-microsecond PPD. Strength-duration functions, previously shown to relate to survival of spiral ganglion cells and peripheral processes, were compared to charge integration efficiency on selected electrodes. Results showed no significant or systematic relationship between the across-site variation in charge integration efficiency and electrode position or threshold levels. Charge integration efficiency was poorer with the 50-μs threshold anchor, suggesting that greater leakiness was associated with larger PPD dynamic ranges. Poorer and more variable charge integration efficiency across electrodes was associated with longer duration of any hearing loss, consistent with the idea that poor integration is related to neural degeneration. More variable integration efficiency was also associated with poorer speech recognition performance across test ears. The slopes of the strength-duration functions at maximum acceptable loudness were significantly correlated with charge integration efficiency. However, the strength-duration slopes were not predictive of duration of any hearing loss or speech recognition performance in our participants. As such, charge integration efficiency may be a better candidate to measure leakiness in neural populations across the electrode array, as well as the general health of the auditory nerve in human cochlear implant recipients.

scholarly journals Perceptual Spaces Induced by Cochlear Implant All-Polar Stimulation Mode

2016 ◽  
Vol 20 ◽  
pp. 233121651665925 ◽  
Author(s):  
Jeremy Marozeau ◽  
Colette M. McKay
Keyword(s):  
Cochlear Implant ◽  
Stimulation Mode

scholarly journals Effect of Increasing Pulse Phase Duration on Neural Responsiveness of the Electrically Stimulated Cochlear Nerve

Ear & Hearing ◽  
2020 ◽  
Vol 41 (6) ◽  
pp. 1606-1618 ◽  
Author(s):  
Shuman He ◽  
Lei Xu ◽  
Jeffrey Skidmore ◽  
Xiuhua Chao ◽  
William J. Riggs ◽  
...  
Keyword(s):  
Cochlear Nerve ◽  
Phase Duration ◽  
Pulse Phase
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