Interaural time difference sensitivity with high rate electrical pulse trains in bilateral cochlear implant users

2016 ◽  
Vol 139 (4) ◽  
pp. 1993-1993
Author(s):  
Alan Kan
Keyword(s):  
Cochlear Implant ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Electrical Pulse ◽  
High Rate ◽  
Pulse Trains ◽  
Bilateral Cochlear Implant

scholarly journals Neural ITD coding with bilateral cochlear implants: effect of binaurally coherent jitter

2012 ◽  
Vol 108 (3) ◽  
pp. 714-728 ◽  
Author(s):  
Kenneth E. Hancock ◽  
Yoojin Chung ◽  
Bertrand Delgutte
Keyword(s):  
Pulse Rate ◽  
Interaural Time Difference ◽  
Time Difference ◽  
High Rate ◽  
Neural Responses ◽  
Neural Basis ◽  
Pulse Trains ◽  
Bilateral Cochlear Implants ◽  
Periodic Pulse ◽  
High Pulse

Poor sensitivity to the interaural time difference (ITD) constrains the ability of human bilateral cochlear implant users to listen in everyday noisy acoustic environments. ITD sensitivity to periodic pulse trains degrades sharply with increasing pulse rate but can be restored at high pulse rates by jittering the interpulse intervals in a binaurally coherent manner (Laback and Majdak. Binaural jitter improves interaural time-difference sensitivity of cochlear implantees at high pulse rates. Proc Natl Acad Sci USA 105: 814–817, 2008). We investigated the neural basis of the jitter effect by recording from single inferior colliculus (IC) neurons in bilaterally implanted, anesthetized cats. Neural responses to trains of biphasic pulses were measured as a function of pulse rate, jitter, and ITD. An effect of jitter on neural responses was most prominent for pulse rates above 300 pulses/s. High-rate periodic trains evoked only an onset response in most IC neurons, but introducing jitter increased ongoing firing rates in about half of these neurons. Neurons that had sustained responses to jittered high-rate pulse trains showed ITD tuning comparable with that produced by low-rate periodic pulse trains. Thus, jitter appears to improve neural ITD sensitivity by restoring sustained firing in many IC neurons. The effect of jitter on IC responses is qualitatively consistent with human psychophysics. Action potentials tended to occur reproducibly at sparse, preferred times across repeated presentations of high-rate jittered pulse trains. Spike triggered averaging of responses to jittered pulse trains revealed that firing was triggered by very short interpulse intervals. This suggests it may be possible to restore ITD sensitivity to periodic carriers by simply inserting short interpulse intervals at select times.

scholarly journals Effect of Channel Envelope Synchrony on Interaural Time Difference Sensitivity in Bilateral Cochlear Implant Listeners

2015 ◽  
Vol 36 (4) ◽  
pp. e199-e206 ◽  
Author(s):  
Tom Francart ◽  
Anneke Lenssen ◽  
Andreas Büchner ◽  
Thomas Lenarz ◽  
Jan Wouters
Keyword(s):  
Cochlear Implant ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Bilateral Cochlear Implant

Does electrode placement affect the interaural-time-difference acuity in bilateral cochlear-implant listeners?

2018 ◽  
Vol 144 (3) ◽  
pp. 1710-1710
Author(s):  
Olga A. Stakhovskaya ◽  
Joshua G. Bernstein ◽  
Jack H. Noble ◽  
Kenneth K. Jensen ◽  
Michael Hoa ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Electrode Placement ◽  
Bilateral Cochlear Implant

scholarly journals Interaural Time-Difference Discrimination as a Measure of Place of Stimulation for Cochlear-Implant Users With Single-Sided Deafness

2018 ◽  
Vol 22 ◽  
pp. 233121651876551 ◽  
Author(s):  
Joshua G. W. Bernstein ◽  
Olga A. Stakhovskaya ◽  
Gerald I. Schuchman ◽  
Kenneth K. Jensen ◽  
Matthew J. Goupell
Keyword(s):  
Cochlear Implant ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Single Sided Deafness

Interaural‐time‐difference sensitivity to acoustic temporally‐jittered pulse trains

2008 ◽  
Vol 123 (5) ◽  
pp. 3562-3562 ◽  
Author(s):  
Matthew J. Goupell ◽  
Piotr Majdak ◽  
Bernhard Laback
Keyword(s):  
Interaural Time Difference ◽  
Time Difference ◽  
Pulse Trains

Neural activity of functionally different retinal ganglion cells can be robustly modulated by high-rate electrical pulse trains

2020 ◽  
Vol 17 (4) ◽  
pp. 045013 ◽  
Author(s):  
Madhuvanthi Muralidharan ◽  
Tianruo Guo ◽  
Mohit N Shivdasani ◽  
David Tsai ◽  
Shelley Fried ◽  
...  
Keyword(s):  
Retinal Ganglion Cells ◽  
Neural Activity ◽  
Ganglion Cells ◽  
Electrical Pulse ◽  
High Rate ◽  
Retinal Ganglion ◽  
Pulse Trains

scholarly journals Reweighting of Binaural Localization Cues in Bilateral Cochlear-Implant Listeners

2021 ◽  
Author(s):  
Maike Klingel ◽  
Bernhard Laback
Keyword(s):  
Cochlear Implant ◽  
Sound Localization ◽  
Visual Information ◽  
Electrode Pair ◽  
Optimal Conditions ◽  
Visual Reinforcement ◽  
Pulse Trains ◽  
Before And After ◽  
Bilateral Cochlear Implant ◽  
Binaural Localization

AbstractNormal-hearing (NH) listeners rely on two binaural cues, the interaural time (ITD) and level difference (ILD), for azimuthal sound localization. Cochlear-implant (CI) listeners, however, rely almost entirely on ILDs. One reason is that present-day clinical CI stimulation strategies do not convey salient ITD cues. But even when presenting ITDs under optimal conditions using a research interface, ITD sensitivity is lower in CI compared to NH listeners. Since it has recently been shown that NH listeners change their ITD/ILD weighting when only one of the cues is consistent with visual information, such reweighting might add to CI listeners’ low perceptual contribution of ITDs, given their daily exposure to reliable ILDs but unreliable ITDs. Six bilateral CI listeners completed a multi-day lateralization training visually reinforcing ITDs, flanked by a pre- and post-measurement of ITD/ILD weights without visual reinforcement. Using direct electric stimulation, we presented 100- and 300-pps pulse trains at a single interaurally place-matched electrode pair, conveying ITDs and ILDs in various spatially consistent and inconsistent combinations. The listeners’ task was to lateralize the stimuli in a virtual environment. Additionally, ITD and ILD thresholds were measured before and after training. For 100-pps stimuli, the lateralization training increased the contribution of ITDs slightly, but significantly. Thresholds were neither affected by the training nor correlated with weights. For 300-pps stimuli, ITD weights were lower and ITD thresholds larger, but there was no effect of training. On average across test sessions, adding azimuth-dependent ITDs to stimuli containing ILDs increased the extent of lateralization for both 100- and 300-pps stimuli. The results suggest that low-rate ITD cues, robustly encoded with future CI systems, may be better exploitable for sound localization after increasing their perceptual weight via training.

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