scholarly journals Sensitivity of bilateral cochlear implant users to fine-structure and envelope interaural time differences

2013 ◽  
Vol 133 (4) ◽  
pp. 2314-2328 ◽  
Author(s):  
Victor A. Noel ◽  
Donald K. Eddington
Keyword(s):  
Fine Structure ◽  
Cochlear Implant ◽  
Interaural Time Differences ◽  
Bilateral Cochlear Implant

scholarly journals Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users

2016 ◽  
Vol 20 ◽  
pp. 233121651666560 ◽  
Author(s):  
Stefan Zirn ◽  
Susan Arndt ◽  
Antje Aschendorff ◽  
Roland Laszig ◽  
Thomas Wesarg
Keyword(s):  
Fine Structure ◽  
Cochlear Implant ◽  
Interaural Phase ◽  
Coding Strategies ◽  
Bilateral Cochlear Implant ◽  
Phase Differences

scholarly journals Spatial Hearing by Bilateral Cochlear Implant Users With Temporal Fine-Structure Processing

2020 ◽  
Vol 11 ◽  
Author(s):  
Sebastián A. Ausili ◽  
Martijn J. H. Agterberg ◽  
Andreas Engel ◽  
Christiane Voelter ◽  
Jan Peter Thomas ◽  
...  
Keyword(s):  
Fine Structure ◽  
Cochlear Implant ◽  
Spatial Hearing ◽  
Temporal Fine Structure ◽  
Bilateral Cochlear Implant

scholarly journals Sensitivity of Inferior Colliculus Neurons to Interaural Time Differences in the Envelope Versus the Fine Structure With Bilateral Cochlear Implants

2008 ◽  
Vol 99 (5) ◽  
pp. 2390-2407 ◽  
Author(s):  
Zachary M. Smith ◽  
Bertrand Delgutte
Keyword(s):  
Fine Structure ◽  
Inferior Colliculus ◽  
Cochlear Implants ◽  
Pulse Train ◽  
Modulation Frequency ◽  
Fixed Rate ◽  
Interaural Time Differences ◽  
Pulse Trains ◽  
Bilateral Cochlear Implants ◽  
Bilateral Cochlear Implant

Bilateral cochlear implantation seeks to improve hearing by taking advantage of the binaural processing of the central auditory system. Cochlear implants typically encode sound in each spectral channel by amplitude modulating (AM) a fixed-rate pulse train, thus interaural time differences (ITD) are only delivered in the envelope. We investigated the ITD sensitivity of inferior colliculus (IC) neurons with sinusoidally AM pulse trains. ITD was introduced independently to the AM and/or carrier pulses to measure the relative efficacy of envelope and fine structure for delivering ITD information. We found that many IC cells are sensitive to ITD in both the envelope (ITDenv) and fine structure (ITDfs) for appropriate modulation frequencies and carrier rates. ITDenv sensitivity was generally similar to that seen in normal-hearing animals with AM tones. ITDenv tuning generally improved with increasing modulation frequency up to the maximum modulation frequency that elicited a sustained response in a neuron (tested ≤160 Hz). ITDfs sensitivity was present in about half the neurons for 1,000 pulse/s (pps) carriers and was nonexistent at 5,000 pps. The neurons that were sensitive to ITDfs at 1,000 pps were those that showed the best ITD sensitivity to low-rate pulse trains. Overall, the best ITD sensitivity was found for ITD contained in the fine structure of a moderate rate AM pulse train (1,000 pps). These results suggest that the interaural timing of current pulses should be accurately controlled in a bilateral cochlear implant processing strategy that provides salient ITD cues.

scholarly journals Chronic Bilateral Cochlear Implant Stimulation in Early-Deaf Rabbits Restores Neural Binaural Sensitivity

2019 ◽  
Author(s):  
Woongsang Sunwoo ◽  
Bertrand Delgutte ◽  
Yoojin Chung
Keyword(s):  
Cochlear Implant ◽  
Sound Localization ◽  
Temporal Coding ◽  
Functional Restoration ◽  
Single Neurons ◽  
Chronic Stimulation ◽  
Interaural Time Differences ◽  
Speech Reception ◽  
Bilateral Cochlear Implant ◽  
Auditory Experience

AbstractCochlear implant (CI) users with a pre-lingual onset of hearing loss show poor sensitivity to interaural time differences (ITD), an important cue for sound localization and speech reception in noise. Similarly, neural ITD sensitivity in the inferior colliculus (IC) of neonatally-deafened animals is degraded compared to animals deafened as adults. Here, we show that chronic bilateral CI stimulation during development can partly reverse the effect of early-onset deafness on ITD sensitivity. The prevalence of ITD sensitive neurons was restored to the level of adult-deaf rabbits in the early-deaf rabbits that received chronic stimulation with wearable bilateral sound processors during development. In contrast, chronic CI stimulation did not improve temporal coding in early-deaf rabbits. The present study is the first report showing functional restoration of ITD sensitivity with CI stimulation in single neurons and highlights the importance of auditory experience during development.

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