TY  - JOUR
AU  - Bruce, Ian C.
AU  - White, Mark W.
AU  - Irlicht, Laurence S.
AU  - O'Leary, Stephen J.
AU  - Clark, Graeme M.
Y2  - 2014/05/21
Y1  - 1999
UR  - http://hdl.handle.net/11343/27532
AB  - Most models of auditory nerve response to electrical stimulation are deterministic, despite significant physiological evidence for stochastic activity. Furthermore, psychophysical models and analyses of physiological data using deterministic descriptions do not accurately predict many psychophysical phenomena. In this paper we investigate whether inclusion of stochastic activity in neural models improves such predictions. To avoid the complication of interpulse interactions and to enable the use of a simpler and faster auditory nerve model we restrict our investigation to single pulses and low-rate (<200 pulses/s) pulse trains. We apply signal detection theory to produce direct predictions of behavioural threshold, dynamic range and intensity difference limen. Specifically, we investigate threshold versus pulse duration (the strength-duration characteristics), threshold and uncomfortable loudness (and the corresponding dynamic range) versus phase duration, the effects of electrode configuration on dynamic range and on strength-duration, threshold versus number of pulses (the temporal-integration characteristics), intensity difference limen as a function of loudness, and the effects of neural survival on these measures. For all psychophysical measures investigated, the inclusion of stochastic activity in the auditory nerve model was found to produce more accurate predictions.
KW  - otolaryngology
KW  - auditory nerve
KW  - cochlear implant
KW  - dynamic range
KW  - functional electrical stimulation
KW  - intensity difference limen (IDL)
KW  - psychophysics
KW  - stochastic model
KW  - threshold
KW  - uncomfortable loudness
T1  - The effects of stochastic neural activity in a model predicting intensity perception with cochlear implants: low-rate stimulation
IS  - IEEE Transactions on Biomedical Engineering
VL  - 46
IS  - 12
SP  - 1393-1404
L1  - /bitstream/handle/11343/27532/119514_final_effects%20of%20stochastic.pdf?sequence=1&isAllowed=y
ER  -