Rate modulation detection thresholds for cochlear implant users

2018 ◽  
Vol 143 (2) ◽  
pp. 1214-1222 ◽  
Author(s):  
Tim Brochier ◽  
Colette McKay ◽  
Hugh McDermott
Keyword(s):  
Cochlear Implant ◽  
Detection Thresholds ◽  
Rate Modulation ◽  
Modulation Detection

Effects of amplitude compression on first- and second-order modulation detection thresholds in cochlear implant listeners

2004 ◽  
Vol 43 (5) ◽  
pp. 264-270 ◽  
Author(s):  
Christian Lorenzi ◽  
Jérome Sibellas ◽  
Christian Füllgrabe ◽  
Stéphane Gallégo ◽  
Claude Fugain ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Second Order ◽  
Detection Thresholds ◽  
Amplitude Compression ◽  
Modulation Detection

scholarly journals Evaluation of Cochlear Implant Candidates using a Non-linguistic Spectrotemporal Modulation Detection Test

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ji Eun Choi ◽  
Sung Hwa Hong ◽  
Jong Ho Won ◽  
Hee-Sung Park ◽  
Young Sang Cho ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Modulation Detection

Performance of the Piecewise Rate Modulation Strategy to Convey Mandarin Tonal Information for Cochlear Implant Using Neural Network Simulation

2011 ◽  
Vol 474-476 ◽  
pp. 1049-1052
Author(s):  
Tian Guan ◽  
Qin Gong ◽  
Tong Zhou
Keyword(s):  
Neural Network ◽  
Cochlear Implant ◽  
Spectral Information ◽  
Rate Variation ◽  
Tonal Language ◽  
Rate Modulation ◽  
Stimulus Rate ◽  
Monosyllabic Words ◽  
Electric Stimulator ◽  
Mandarin Tones

In order to improve the pitch perception of cochlear implant (CI) users speaking tonal language, it has been suggested to frequency-modulate the electric stimulus rate by the spectral information of the tonal language. A piecewise CI rate modulation strategy has been recently proposed, which not only encoded the spectral information but also took account of the psychological perception feature for the stimulus rate variation by CI users. This paper further examines its performance to convey Mandarin tonal information by a neural-network-based simulation. The experimental results shown that the correct rates to identify the four Mandarin tones of 80 Mandarin monosyllabic words were 95%, 95%, 100% and 100%, respectively, indicating that the piecewise rate modulation strategy might efficiently convey Mandarin tonal information. Therefore, the piecewise rate modulation strategy could help to design novel CI electric stimulator and enhance the speech perception ability of CI users speaking tonal language, such as Mandarin.

scholarly journals How Do Age and Hearing Loss Impact Spectral Envelope Perception?

2018 ◽  
Vol 61 (9) ◽  
pp. 2376-2385 ◽  
Author(s):  
Erol J. Ozmeral ◽  
Ann C. Eddins ◽  
David A. Eddins
Keyword(s):  
Hearing Loss ◽  
Spectral Resolution ◽  
Modulation Frequency ◽  
Normal Hearing ◽  
Frequency Resolution ◽  
Spectral Envelope ◽  
Detection Thresholds ◽  
Spectral Modulation ◽  
Modulation Detection ◽  
Moderate Hearing Loss

Purpose The goal was to evaluate the potential effects of increasing hearing loss and advancing age on spectral envelope perception. Method Spectral modulation detection was measured as a function of spectral modulation frequency from 0.5 to 8.0 cycles/octave. The spectral modulation task involved discrimination of a noise carrier (3 octaves wide from 400 to 3200 Hz) with a flat spectral envelope from a noise having a sinusoidal spectral envelope across a logarithmic audio frequency scale. Spectral modulation transfer functions (SMTFs; modulation threshold vs. modulation frequency) were computed and compared 4 listener groups: young normal hearing, older normal hearing, older with mild hearing loss, and older with moderate hearing loss. Estimates of the internal spectral contrast were obtained by computing excitation patterns. Results SMTFs for young listeners with normal hearing were bandpass with a minimum modulation detection threshold at 2 cycles/octave, and older listeners with normal hearing were remarkably similar to those of the young listeners. SMTFs for older listeners with mild and moderate hearing loss had a low-pass rather than a bandpass shape. Excitation patterns revealed that limited spectral resolution dictated modulation detection thresholds at high but not low spectral modulation frequencies. Even when factoring out (presumed) differences in frequency resolution among groups, the spectral envelope perception was worse for the group with moderate hearing loss than the other 3 groups. Conclusions The spectral envelope perception as measured by spectral modulation detection thresholds is compromised by hearing loss at higher spectral modulation frequencies, consistent with predictions of reduced spectral resolution known to accompany sensorineural hearing loss. Spectral envelope perception is not negatively impacted by advancing age at any spectral modulation frequency between 0.5 and 8.0 cycles/octave.

Modulation detection thresholds for cochlear implants: Dependence on stimulation site and stimulus level

2006 ◽  
Vol 120 (5) ◽  
pp. 3342-3342 ◽  
Author(s):  
Bryan E. Pfingst ◽  
Rose A. Burkholder ◽  
Catherine S. Thompson ◽  
Li Xu
Keyword(s):  
Cochlear Implants ◽  
Stimulus Level ◽  
Stimulation Site ◽  
Detection Thresholds ◽  
Modulation Detection
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