Current Steering and Current Focusing in Cochlear Implants: Comparison of Monopolar, Tripolar, and Virtual Channel Electrode Configurations

2008 ◽  
Vol 29 (2) ◽  
pp. 250-260 ◽  
Author(s):  
Carlo K. Berenstein ◽  
Lucas H. M. Mens ◽  
Jef J. S. Mulder ◽  
Filiep J. Vanpoucke
Keyword(s):  
Cochlear Implants ◽  
Virtual Channel ◽  
Current Steering ◽  
Current Focusing ◽  
Channel Electrode

scholarly journals Pitch ranking, electrode discrimination, and physiological spread of excitation using current steering in cochlear implants

2014 ◽  
Vol 136 (6) ◽  
pp. 3159-3171 ◽  
Author(s):  
Jenny L. Goehring ◽  
Donna L. Neff ◽  
Jacquelyn L. Baudhuin ◽  
Michelle L. Hughes
Keyword(s):  
Cochlear Implants ◽  
Current Steering ◽  
Spread Of Excitation

scholarly journals Effect of current focusing on the sensitivity of inferior colliculus neurons to amplitude-modulated stimulation

2016 ◽  
Vol 116 (3) ◽  
pp. 1104-1116 ◽  
Author(s):  
Shefin S. George ◽  
Mohit N. Shivdasani ◽  
James B. Fallon
Keyword(s):  
Inferior Colliculus ◽  
Cochlear Implants ◽  
Modulation Depth ◽  
Neural Activation ◽  
Detection Thresholds ◽  
P Values ◽  
Pulse Trains ◽  
Spectral Cues ◽  
Current Focusing ◽  
Channel Interactions

In multichannel cochlear implants (CIs), current is delivered to specific electrodes along the cochlea in the form of amplitude-modulated pulse trains, to convey temporal and spectral cues. Our previous studies have shown that focused multipolar (FMP) and tripolar (TP) stimulation produce more restricted neural activation and reduced channel interactions in the inferior colliculus (IC) compared with traditional monopolar (MP) stimulation, suggesting that focusing of stimulation could produce better transmission of spectral information. The present study explored the capability of IC neurons to detect modulated CI stimulation with FMP and TP stimulation compared with MP stimulation. The study examined multiunit responses of IC neurons in acutely deafened guinea pigs by systematically varying the stimulation configuration, modulation depth, and stimulation level. Stimuli were sinusoidal amplitude-modulated pulse trains (carrier rate of 120 pulses/s). Modulation sensitivity was quantified by measuring modulation detection thresholds (MDTs), defined as the lowest modulation depth required to differentiate the response of a modulated stimulus from an unmodulated one. Whereas MP stimulation showed significantly lower MDTs than FMP and TP stimulation ( P values <0.05) at stimulation ≤2 dB above threshold, all stimulation configurations were found to have similar modulation sensitivities at 4 dB above threshold. There was no difference found in modulation sensitivity between FMP and TP stimulation. The present study demonstrates that current focusing techniques such as FMP and TP can adequately convey amplitude modulation and are comparable to MP stimulation, especially at higher stimulation levels, although there may be some trade-off between spectral and temporal fidelity with current focusing stimulation.

Dynamic current steering with phantom electrode in cochlear implants

2020 ◽  
Vol 390 ◽  
pp. 107949
Author(s):  
Xin Luo ◽  
Christopher Garrett
Keyword(s):  
Cochlear Implants ◽  
Current Steering

Use of Multichannel Cochlear Implants in Obstructed and Obliterated Cochleas

1988 ◽  
Vol 98 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Bruce J. Gantz ◽  
Brian F. Mccabe ◽  
Richard S. Tyler
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implants ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Single Channel ◽  
Scala Tympani ◽  
Radiographic Evidence ◽  
Early Experiences ◽  
Channel Electrode ◽  
Gain Access

Obstruction that occurs within the scala tympani (after meningitis or otosclerosis) has been considered a contraindication for placement of a multichannel cochlear implant electrode. Two patients who exhibited radiographic evidence of intracochlear narrowing and obliteration were implanted with multichannel electrodes. Implantation involved creation of a channel for the electrode to wrap around the modiolus. The middle ear cavity and the external auditory canal also had to be removed to gain access. The response of one of the patients was similar to that of patients with normal cochlear anatomy who use multichannel devices. These early experiences, along with one case in which a single-channel electrode was placed, is presented.

scholarly journals Dynamic current focusing for loudness encoding in cochlear implants: a take-home trial

2019 ◽  
Vol 58 (9) ◽  
pp. 553-564 ◽  
Author(s):  
Monique A. M. de Jong ◽  
Jeroen J. Briaire ◽  
Séline F. S. van der Woude ◽  
Johan H. M. Frijns
Keyword(s):  
Cochlear Implants ◽  
Current Focusing

scholarly journals Signal Processing Strategies for Cochlear Implants Using Current Steering

2009 ◽  
Vol 2009 (1) ◽  
Author(s):  
Waldo Nogueira ◽  
Leonid Litvak ◽  
Bernd Edler ◽  
Jörn Ostermann ◽  
Andreas Büchner
Keyword(s):  
Signal Processing ◽  
Cochlear Implants ◽  
Current Steering ◽  
Processing Strategies

Music Perception in Adult Users of Cochlear Implants: A Brief Review

2015 ◽  
Vol 22 (1) ◽  
pp. 4-11
Author(s):  
Robert C. Jensen ◽  
Sarah Hargus Ferguson
Keyword(s):  
Cochlear Implants ◽  
Music Perception ◽  
Training Programs ◽  
Musical Training ◽  
Current Steering ◽  
Structure Information ◽  
Auditory Nervous System ◽  
Processing Strategies ◽  
Melody Perception ◽  
Place Pitch

Although cochlear implants (CIs) can provide good speech understanding in quiet, in general, users of CIs have shown poor music perception performance, particularly with regard to pitch (and hence melody). This is primarily due to the limited ability of CI processing strategies and electric stimulation to provide place pitch and fine structure information from the original input signal to the auditory nervous system of the user. Approaches such as current focusing, current steering, enhanced amplitude modulation cues, and optic stimulation have been shown or theorized to assist in music perception, as have musical training programs. This article is a brief review of research related to music perception in adults with CIs, specifically their rhythm, pitch, and melody perception performance; processing strategies that have been or are being developed which might improve their music perception performance; and music training programs that have been shown to improve their music perception performance.

scholarly journals Virtual channel discrimination is improved by current focusing in cochlear implant recipients

2009 ◽  
Vol 254 (1-2) ◽  
pp. 34-41 ◽  
Author(s):  
David M. Landsberger ◽  
Arthi G. Srinivasan
Keyword(s):  
Cochlear Implant ◽  
Virtual Channel ◽  
Current Focusing
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