scholarly journals Deep electrode insertion and sound coding in cochlear implants

2015 ◽  
Vol 322 ◽  
pp. 14-23 ◽  
Author(s):  
Ingeborg Hochmair ◽  
Erwin Hochmair ◽  
Peter Nopp ◽  
Melissa Waller ◽  
Claude Jolly
Keyword(s):  
Cochlear Implants ◽  
Sound Coding ◽  
Electrode Insertion

scholarly journals Hearing restoration by a low-weight power-efficient multichannel optogenetic cochlear implant system

2020 ◽  
Author(s):  
Lukasz Jablonski ◽  
Tamas Harczos ◽  
Bettina Wolf ◽  
Gerhard Hoch ◽  
Alexander Dieter ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Acoustic Stimulation ◽  
Power Efficient ◽  
Fine Grained ◽  
Sound Coding ◽  
Large Sets ◽  
Current Spread ◽  
Low Weight ◽  
Implant System ◽  
And Control

In case of deafness, cochlear implants bypass dysfunctional or lost hair cells by direct electrical stimulation (eCIs) of the auditory nerve. However, spectral selectivity of eCI sound coding is low as the wide current spread from each electrode activates large sets of neurons that align to a place-frequency (tonotopic) map in the cochlea. As light can be better confined in space, optical cochlear implants (oCIs) promise to overcome this shortcoming of eCIs. This requires fine-grained, fast, and power-efficient real-time sound analysis and control of multiple microscale emitters. Here, we describe the development, characterisation, and application for hearing restoration of a preclinical low-weight and wireless LED-based multichannel oCI system and its companion eCI system. The head-worn oCI system enabled deafened rats to perform a locomotion task in response to acoustic stimulation proving the concept of multichannel optogenetic hearing restoration in rodents.

scholarly journals Sound Coding in Cochlear Implants: From electric pulses to hearing

2015 ◽  
Vol 32 (2) ◽  
pp. 67-80 ◽  
Author(s):  
Jan Wouters ◽  
Hugh Joseph McDermott ◽  
Tom Francart
Keyword(s):  
Cochlear Implants ◽  
Electric Pulses ◽  
Sound Coding

Gender Categorization in Cochlear Implant Users

2013 ◽  
Vol 56 (5) ◽  
pp. 1389-1401 ◽  
Author(s):  
Zoé Massida ◽  
Mathieu Marx ◽  
Pascal Belin ◽  
Christopher James ◽  
Bernard Fraysse ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Normal Hearing ◽  
Acoustic Parameter ◽  
Sound Coding ◽  
Gender Categorization ◽  
Voice Morphing ◽  
Ambiguous Stimuli ◽  
Voice Processing ◽  
The Voice ◽  
Temporal Degradation

Purpose In this study, the authors examined the ability of subjects with cochlear implants (CIs) to discriminate voice gender and how this ability evolved as a function of CI experience. Method The authors presented a continuum of voice samples created by voice morphing, with 9 intermediate acoustic parameter steps between a typical male and a typical female. This method allowed for the evaluation of gender categorization not only when acoustical features were specific to gender but also for more ambiguous cases, when fundamental frequency or formant distribution were located between typical values. Results Results showed a global, though variable, deficit for voice gender categorization in CI recipients compared with subjects with normal hearing. This deficit was stronger for ambiguous stimuli in the voice continuum: Average performance scores for CI users were 58% lower than average scores for subjects with normal hearing in cases of ambiguous stimuli and 19% lower for typical male and female voices. The authors found no significant improvement in voice gender categorization with CI experience. Conclusions These results emphasize the dissociation between recovery of speech recognition and voice feature perception after cochlear implantation. This large and durable deficit may be related to spectral and temporal degradation induced by CI sound coding, or it may be related to central voice processing deficits.

New Trends with Cochlear Implants and Atraumaticity Demonstrated by Deep Electrode Insertion and Hearing Preservation

2012 ◽  
Vol 132 (0) ◽  
pp. 40-46
Author(s):  
Claude Jolly ◽  
Pavel Mistr^|^iacute;k ◽  
Gunesh Rajan ◽  
Kevin Green ◽  
Hinrich Staecker ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Hearing Preservation ◽  
Electrode Insertion

Short electrode insertion in cochlear implants: performance on speech perception

2004 ◽  
Vol 5 (S1) ◽  
pp. 126-128 ◽  
Author(s):  
Katie Mee Yee Chu ◽  
Dennis Kin Kwok Au ◽  
Yau Hui ◽  
Chun Kuen Chow ◽  
Ripley Kit Wong ◽  
...  
Keyword(s):  
Speech Perception ◽  
Cochlear Implants ◽  
Electrode Insertion

Multichannel Cochlear Implants in Partially Ossified Cochleas

1988 ◽  
Vol 97 (5_suppl2) ◽  
pp. 3-7 ◽  
Author(s):  
Thomas Balkany ◽  
Bruce Gantz ◽  
Joseph B. Nadol
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implants ◽  
San Francisco ◽  
Potential Benefit ◽  
University Of California ◽  
Speech Discrimination ◽  
Computed Tomographic ◽  
Open Set ◽  
Computed Tomographic Scan ◽  
Electrode Insertion

Deposition of bone within the fluid spaces of the cochlea is encountered commonly in cochlear implant candidates and previously has been considered a relative contraindication to the use of multichannel intracochlear electrodes. This contraindication has been based on possible mechanical difficulty with electrode insertion as well as uncertainty about the potential benefit of the multichannel device in the patient. Fifteen profoundly deaf patients with partial ossification of the basal turn of the cochlea received implants with long intracochlear electrodes (11, Nucleus; 1, University of California at San Francisco/Storz; and 3, Symbion/Inneraid). In 11 cases, ossification had been predicted preoperatively by computed tomographic scan. Electrodes were completely inserted in 14 patients, and partial insertion was accomplished in one patient. All patients currently are using their devices and nine of 12 postlingually deaf patients have achieved some degree of open-set speech discrimination. This series demonstrates that in experienced hands, insertion of long multichannel electrodes into partially ossified cochleas is possible and that results are similar to those achieved in patients who have nonossified cochleas.

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