title: Disrupting within-channel cues to comodulation masking release.
abstract: Comodulation masking release (CMR), assessed using a flanking-band (FB) paradigm, may reflect the contribution of both across- and within-channel cues when FBs are proximal to the signal frequency. This study examined the effect of disrupting within-channel cues based upon envelope beats at the output of an auditory filter centered at the signal frequency, using a method described by Richards [(1988) Hear. Res. 35, 47-58], here called "on-frequency band (OFB) reversal." This removed regular beats for a pair of proximal FBs centered symmetrically about the OFB on a linear frequency scale (but not for a single FB that had the same center frequency as either of the constituent FBs in a pair) while maintaining the comodulation of individual noise bands that provides the basis for across-channel processes. OFB reversal consistently reduced CMR for proximal FB pairs--but not for a single FB or distal FB pair or when the FBs were presented in the opposite ear to the signal plus OFB--across a range of signal frequencies and for continuous and gated noise presentation. Simulations indicated that OFB reversal reduces the availability of within-channel cues based upon temporal fine structure and changes in envelope statistics.
authors.affiliation: Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, England. sag47@cam.ac.uk
authors.forename: Simon A
authors.initials: SA
authors.lastname: Goldman
authors.forename: Thomas
authors.initials: T
authors.lastname: Baer
authors.forename: Brian C J
authors.initials: BC
authors.lastname: Moore
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D001309:Auditory Threshold; D003198:Computer Simulation; D003463:Cues; D004007:Dichotic Listening Tests; D004056:Differential Threshold; D005260:Female; D006801:Humans; D008297:Male; D008959:Models, Neurological; D009622:Noise; D010470:Perceptual Masking / Q000502:physiology*; D010898:Pitch Perception / Q000502:physiology; D017603:Signal Detection, Psychological / Q000502:physiology; D055815:Young Adult