scholarly journals Effects of carrier pulse rate and stimulation site on modulation detection by subjects with cochlear implants

2007 ◽  
Vol 121 (4) ◽  
pp. 2236-2246 ◽  
Author(s):  
Bryan E. Pfingst ◽  
Li Xu ◽  
Catherine S. Thompson
Keyword(s):  
Cochlear Implants ◽  
Pulse Rate ◽  
Stimulation Site ◽  
Modulation Detection

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

scholarly journals Temporal Modulation Detection in Children and Adults With Cochlear Implants

2019 ◽  
Vol 40 (3) ◽  
pp. e311-e315 ◽  
Author(s):  
David Mark Landsberger ◽  
Natalia Stupak ◽  
Janet Green ◽  
Kaitlyn Tona ◽  
Monica Padilla ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Temporal Modulation ◽  
Modulation Detection

Effects of Pulse Width, Pulse Rate and Paired Electrode Stimulation on Psychophysical Measures of Dynamic Range and Speech Recognition in Cochlear Implants

2012 ◽  
Vol 33 (4) ◽  
pp. 489-496 ◽  
Author(s):  
Raymond M. Bonnet ◽  
Peter-Paul B. M. Boermans ◽  
Otto F. Avenarius ◽  
Jeroen J. Briaire ◽  
Johan H. M. Frijns
Keyword(s):  
Speech Recognition ◽  
Cochlear Implants ◽  
Pulse Rate ◽  
Pulse Width ◽  
Dynamic Range ◽  
Electrode Stimulation

scholarly journals Auditory Temporal Acuity Probed With Cochlear Implant Stimulation and Cortical Recording

2010 ◽  
Vol 103 (1) ◽  
pp. 531-542 ◽  
Author(s):  
Alana E. Kirby ◽  
John C. Middlebrooks
Keyword(s):  
Auditory Cortex ◽  
Pulse Rate ◽  
Auditory Nerve ◽  
Acoustic Noise ◽  
Forward Masking ◽  
Neural Mechanisms ◽  
Gap Detection ◽  
Temporal Acuity ◽  
Pulse Trains ◽  
Modulation Detection

Cochlear implants stimulate the auditory nerve with amplitude-modulated (AM) electric pulse trains. Pulse rates >2,000 pulses per second (pps) have been hypothesized to enhance transmission of temporal information. Recent studies, however, have shown that higher pulse rates impair phase locking to sinusoidal AM in the auditory cortex and impair perceptual modulation detection. Here, we investigated the effects of high pulse rates on the temporal acuity of transmission of pulse trains to the auditory cortex. In anesthetized guinea pigs, signal-detection analysis was used to measure the thresholds for detection of gaps in pulse trains at rates of 254, 1,017, and 4,069 pps and in acoustic noise. Gap-detection thresholds decreased by an order of magnitude with increases in pulse rate from 254 to 4,069 pps. Such a pulse-rate dependence would likely influence speech reception through clinical speech processors. To elucidate the neural mechanisms of gap detection, we measured recovery from forward masking after a 196.6-ms pulse train. Recovery from masking was faster at higher carrier pulse rates and masking increased linearly with current level. We fit the data with a dual-exponential recovery function, consistent with a peripheral and a more central process. High-rate pulse trains evoked less central masking, possibly due to adaptation of the response in the auditory nerve. Neither gap detection nor forward masking varied with cortical depth, indicating that these processes are likely subcortical. These results indicate that gap detection and modulation detection are mediated by two separate neural mechanisms.

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