Dual mechanisms in the perceptual processing of click train temporal regularity.
Two experiments measured human sensitivity to temporal jitter in 25-click trains with inter-click intervals (ICIs) between 5 and 100 ms. In a naturalistic experiment using wideband clicks, jitter thresholds were a nonmonotonic function of ICI, peaking for ICIs near 40-60 ms. In a subsequent experiment, clicks were high-passed and presented against a low-frequency noise masker. Jitter threshold vs ICI functions lost the positive slope over short ICIs but retained the negative slope at long ICIs. The same behavior was seen in click rate discrimination tasks. Different processes mediate regularity analysis for click trains with ICIs above and below 40-60 ms.
Department of Psychology and Neuroscience and Department of Surgery, Dalhousie University, 1355 Oxford Street, PO Box 15000, Halifax, Nova Scotia, Canada B3H 4R2. dennis.phillips@dal.ca
Dennis P
DP
Phillips
Rachel N
RN
Dingle
Susan E
SE
Hall
Moragh
M
Jang
D000161:Acoustic Stimulation; D000328:Adult; D001309:Auditory Threshold / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009622:Noise; D010898:Pitch Perception / Q000502:physiology; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult