The effect of interaural differences in envelope shape on the perceived location of sounds (L).
Users of bilateral cochlear implants and a cochlear implant combined with a contralateral hearing aid are sensitive to interaural time differences (ITDs). The way cochlear implant speech processors work and differences between modalities may result in interaural differences in shape of the temporal envelope presented to the binaural system. The effect of interaural differences in envelope shape on ITD sensitivity was investigated with normal-hearing listeners using a 4 kHz pure tone modulated with a periodic envelope with a trapezoid shape in each cycle. In one ear the onset segment of the trapezoid was transformed by a power function. No effect on the just noticeable difference in ITD was found with an interaural difference in envelope shape, but the ITD for a centered percept was significantly different across envelope shape conditions.
ExpORL, Department of Neurosciences, KU Leuven, O & N 2, Herestraat 49 bus 721, B-3000 Leuven, Belgium. Tom.Francart@med.kuleuven.be
Tom
T
Francart
Anneke
A
Lenssen
Jan
J
Wouters
D000161:Acoustic Stimulation; D000293:Adolescent; D001301:Audiometry, Pure-Tone; D001306:Auditory Pathways / Q000502:physiology*; D001309:Auditory Threshold; D019929:Cochlear Implantation / Q000295:instrumentation; D003054:Cochlear Implants; D012048:Correction of Hearing Impairment / Q000523:psychology; D005260:Female; D006310:Hearing Aids; D006801:Humans; D008144:Loudness Perception; D008297:Male; D008960:Models, Psychological; D019986:Persons with Hearing Disabilities / Q000523:psychology / Q000534:rehabilitation; D012815:Signal Processing, Computer-Assisted; D013017:Sound Localization; D013997:Time Factors; D055815:Young Adult