Hearing better with interaural time differences and bilateral cochlear implants

2014 ◽  
Vol 135 (4) ◽  
pp. 2190-2191 ◽  
Author(s):  
Zachary M. Smith ◽  
Alan Kan ◽  
Heath G. Jones ◽  
Melanie Buhr-Lawler ◽  
Shelly P. Godar ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Interaural Time Differences ◽  
Bilateral Cochlear Implants

Perception and coding of interaural time differences with bilateral cochlear implants

2015 ◽  
Vol 322 ◽  
pp. 138-150 ◽  
Author(s):  
Bernhard Laback ◽  
Katharina Egger ◽  
Piotr Majdak
Keyword(s):  
Cochlear Implants ◽  
Interaural Time Differences ◽  
Bilateral Cochlear Implants

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.

Bilateral Cochlear Implants

ASHA Leader ◽  
2010 ◽  
Vol 15 (2) ◽  
pp. 14-17 ◽  
Author(s):  
Ruth Litovsky
Keyword(s):  
Cochlear Implants ◽  
Bilateral Cochlear Implants
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