Intensity discrimination and detection of amplitude modulation in electric hearing.
Wojtczak and Viemeister [J. Acoust. Soc. Am. 106, 1917-1924 (1999)] demonstrated a close relationship between intensity difference limens (DLs) and 4-Hz amplitude modulation (AM) detection thresholds in normal-hearing acoustic listeners. The present study demonstrates a similar relationship between intensity DLs and AM detection thresholds in cochlear-implant listeners, for gated stimuli. This suggests that acoustic and cochlear-implant listeners make use of a similar decision variable to perform intensity discrimination and modulation detection tasks. It can be shown that the absence of compression in electric hearing does not preclude this possibility.
Donaldson
G S
GS
Department of Otolaryngology, University of Minnesota, Minneapolis 55455, USA. donal005@tc.umn.edu
Viemeister
N F
NF
D019929:Cochlear Implantation; D003638:Deafness / Q000601:surgery; D006801:Humans; D008954:Models, Biological; D013067:Speech Perception / Q000502:physiology*