McKay, Henshall, Farrell, and McDermott [J. Acoust. Soc. Am. 113, 2054–2063 (2003)] developed a practical method to estimate the loudness of periodic electrical signals presented through a cochlear implant. In the present work, this method was extended to time-varying sounds based on two models of time-varying loudness for normal listeners. To fit the model parameters, loudness balancing data was collected with six cochlear implant listeners. The pulse rate of a modulated pulse train was adjusted to equalize its loudness to a reference stimulus. The stimuli were single-electrode time-limited pulse bursts, repeated at a rate of 50 Hz, with on-times varying between 2 and 20 ms. The parameters of two different models of time-varying loudness were fitted to the results. For each model, parameters defining the time windows over which the electrical pulses contribute to instantaneous loudness were optimized. In each case, a good fit was obtained with the loudness balancing results. Therefore, the practical method was successfully extended to time-varying sounds by combining it with existing models of time-varying loudness for acoustic stimulation.
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June 2014
June 01 2014
Loudness of time-varying stimuli with electric stimulation Available to Purchase
Tom Francart;
Tom Francart
a)
ExpORL
, Department of Neurosciences, KU Leuven, Herestraat 49 bus 721, B-3000 Leuven, Belgium
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Hamish Innes-Brown;
Hamish Innes-Brown
The Bionics Institute
, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia
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Hugh J. McDermott;
Hugh J. McDermott
The Bionics Institute
, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia
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Colette M. McKay
Colette M. McKay
The Bionics Institute
, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia
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Tom Francart
a)
Hamish Innes-Brown
Hugh J. McDermott
Colette M. McKay
ExpORL
, Department of Neurosciences, KU Leuven, Herestraat 49 bus 721, B-3000 Leuven, Belgium
a)
Also at: The Bionics Institute, 384-388 Albert Street, East Melbourne VIC 3002, Australia. Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 135, 3513–3519 (2014)
Article history
Received:
October 03 2013
Accepted:
April 10 2014
Citation
Tom Francart, Hamish Innes-Brown, Hugh J. McDermott, Colette M. McKay; Loudness of time-varying stimuli with electric stimulation. J. Acoust. Soc. Am. 1 June 2014; 135 (6): 3513–3519. https://doi.org/10.1121/1.4874597
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