Detection and modulation rate discrimination were measured in cochlear-implant users for pulse-trains that were either sinusoidally amplitude modulated or were modulated with half-wave rectified sinusoids, which in acoustic hearing have been used to simulate the response to low-frequency temporal fine structure. In contrast to comparable results from acoustic hearing, modulation rate discrimination was not statistically different for the two stimulus types. The results suggest that, in contrast to binaural perception, pitch perception in cochlear-implant users does not benefit from using stimuli designed to more closely simulate the cochlear response to low-frequency pure tones.
Bibliographical noteFunding Information:
This research was supported by NIDCD Grant No. R01 DC 006699 and the Lions 5M International Hearing Foundation. The authors thank Advanced Bionics Corporation for providing the BEDCS research interface and Leo Litvak for providing advice and assistance in its implementation. The authors thank the Associate Editor, John Middlebrooks, and three anonymous reviewers for their helpful comments on an earlier version of this manuscript. The authors wish to extend special thanks to the subjects who participated in this study.