Psychometric functions and temporal integration in electric hearing

The Journal of the Acoustical Society of America
G S DonaldsonD A Nelson

Abstract

Temporal-integration functions and psychometric functions for detection were obtained in eight users of the Nucleus 22-electrode cochlear implant. Stimuli were 100-Hz, 200-microseconds/phase trains of biphasic pulses with durations ranging from 0.44 to 630.4 ms (1 to 64 pulses). Temporal-integration functions were measured for 21 electrodes. Slopes of these functions were considerably shallower than the 2.5 dB/doubling slopes typically observed in acoustic hearing. They varied widely across subjects and for different electrodes in a given subject, ranging from 0.06 to 1.94 dB/doubling of stimulus pulses, with a mean [standard deviation (s.d.)] value of 0.42 (0.38). Psychometric functions were measured for 11 of the same 21 electrodes. Slopes of psychometric functions also varied across subjects and electrodes, and were 2-20 times steeper than those reported by other investigators for normal-hearing and cochlear-impaired acoustic listeners. Slopes of individual psychometric functions for 1-, 2-, 4-, and 8-pulse stimuli ranged from 0.20 to 1.84 log d'/dB with a mean (s.d.) value of 0.77 (0.45). Psychometric-function slopes did not vary systematically with stimulus duration in most cases. A clear inverse relation between slopes of...Continue Reading

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Citations

Oct 18, 2012·Journal of the Association for Research in Otolaryngology : JARO·Colette M McKayThomas Lenarz
Feb 24, 2010·Journal of Computational Neuroscience·Joshua H GoldwynJay T Rubinstein
Jan 10, 2012·The Journal of the Acoustical Society of America·Bryan E PfingstGina L Su
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Jun 21, 2011·The Journal of the Acoustical Society of America·Bryan E Pfingst
Apr 6, 2007·The Journal of the Acoustical Society of America·Julie Arenberg Bierer
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May 21, 2015·Journal of the Association for Research in Otolaryngology : JARO·Ning ZhouBryan E Pfingst
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