scholarly journals Corrective binaural processing for bilateral cochlear implant patients

PLoS ONE ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. e0187965 ◽  
Author(s):  
Christopher A. Brown
Keyword(s):  
Cochlear Implant ◽  
Binaural Processing ◽  
Bilateral Cochlear Implant

scholarly journals Computed-tomography estimates of interaural mismatch in insertion depth and scalar location in bilateral cochlear-implant users

2021 ◽  
Author(s):  
Matthew J Goupell ◽  
Jack H Noble ◽  
Sandeep A Phatak ◽  
Elizabeth Kolberg ◽  
Miranda Cleary ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cochlear Implant ◽  
Surgical Techniques ◽  
Superior Olivary Complex ◽  
Negative Consequences ◽  
Scala Tympani ◽  
Insertion Depth ◽  
Binaural Processing ◽  
Bilateral Cochlear Implant ◽  
Interaural Differences

Hypothesis: We hypothesized that the bilateral cochlear-implant (BI-CI) users would have a range of interaural insertion-depth mismatch because of different physical placements or characteristics of the arrays, but less than half of electrodes would have less than 75° or 3 mm of interaural insertion-depth mismatch. We also hypothesized that interaural insertion-depth mismatch would be more prevalent nearer the apex, when electrodes were located outside of scala tympani (i.e., possible interaural scalar mismatch), and when the arrays were a mix of pre-curved and straight types. Background: Brainstem neurons in the superior olivary complex are exquisitely sensitive to interaural differences, the cues to sound localization. These binaurally sensitive neurons rely on interaurally place-of-stimulation-matched inputs at the periphery. BI-CI users may have interaural differences in insertion depth and scalar location, causing interaural place-of-stimulation mismatch that impairs binaural abilities. Methods: Insertion depths and scalar locations were calculated from temporal-bone computed-tomography (CT) scans of 107 BI-CI users (27 Advanced Bionics, 62 Cochlear, and 18 Med-El). Each subject had either both pre-curved, both straight, or one of each type of array (mixed). Results: The median interaural insertion-depth mismatch was 23.4° or 1.3 mm. Relatively large interaural insertion-depth mismatch sufficient to disrupt binaural processing occurred for about 15% of electrode pairs [defined as >75° (13.0% of electrode pairs) or >3 mm (19.0% of electrode pairs)]. There was a significant three-way interaction of insertion depth, scalar location, and array type. Interaural insertion-depth mismatch was most prevalent when electrode pairs were more apically located, electrode pairs had interaural scalar mismatch (i.e., one in Scala Tympani, one in Scala Vestibuli), and when the arrays were both pre-curved. Conclusion: Large interaural insertion-depth mismatch can occur in BI-CI users. For new BI-CI users, improved surgical techniques to avoid interaural insertion-depth and scalar mismatch is recommended. For existing BI-CI users with interaural insertion-depth mismatch, interaural alignment of clinical frequency allocation tables by an audiologist might remediate any negative consequences to spatial-hearing abilities.

scholarly journals Improving Localization and Speech Reception in Noise for Bilateral Cochlear Implant Recipients

2019 ◽  
Vol 23 ◽  
pp. 233121651983149 ◽  
Author(s):  
Wendy B. Potts ◽  
Lakshmish Ramanna ◽  
Trevor Perry ◽  
Christopher J. Long
Keyword(s):  
Cochlear Implant ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Interaural Level Difference ◽  
Mean Square ◽  
Localization Accuracy ◽  
Speech In Noise ◽  
Speech Reception ◽  
Bilateral Cochlear Implant ◽  
Comparative Survey

This study looked at different methods to preserve interaural level difference (ILD) cues for bilateral cochlear implant (BiCI) recipients. One possible distortion to ILD is from automatic gain control (AGC). Localization accuracy of BiCI recipients using default versus increased AGC threshold and linked AGCs versus independent AGCs was examined. In addition, speech reception in noise was assessed using linked versus independent AGCs and enabling and disabling Autosensitivity™ Control. Subjective information via a diary and questionnaire was also collected about maps with linked and independent AGCs during a take-home experience. Localization accuracy improved in the increased AGC threshold and the linked AGCs conditions. Increasing the AGC threshold resulted in a 4° improvement in root mean square error averaged across all speaker locations. Using linked AGCs, BiCI participants experienced an 8° improvement for all speaker locations and a 19° improvement at the speaker location most affected by the AGC. Speech reception threshold in noise improved by an average of 2.5 dB when using linked AGCs versus independent AGCs. In addition, the effect of linked AGCs on speech in noise was compared with that of Autosensitivity™ Control. The Speech, Spatial, and Qualities of Hearing Scale-12 question comparative survey showed an improvement when using maps with linked AGCs. These findings support the hypothesis that ILD cues may be preserved by increasing the AGC threshold or linking AGCs.

scholarly journals Binaural integration abilities in bilateral cochlear implant user

2015 ◽  
Vol 10 (4) ◽  
pp. 150-153 ◽  
Author(s):  
Chie Obuchi ◽  
Masae Shiroma ◽  
Sayaka Ogane ◽  
Kimitaka Kaga
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implant User ◽  
Bilateral Cochlear Implant

Shared monaural and binaural temporal processing limits in bilateral cochlear implant listeners

2016 ◽  
Vol 139 (4) ◽  
pp. 2210-2210
Author(s):  
Antje Ihlefeld ◽  
Robert P. Carlyon ◽  
Alan Kan ◽  
Tyler H. Churchill ◽  
Ruth Y. Litovsky
Keyword(s):  
Cochlear Implant ◽  
Temporal Processing ◽  
Bilateral Cochlear Implant
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