Subject: FW: Intelligibility of reversed speech, Why? From: Yadong Wang <ydwang(at)ELE.URI.EDU> Date: Thu, 25 Jan 2001 11:18:10 -0500Lorenzi wrote: >Saberi & Perrott ("Cognitive restoration of reversed speech," Nature 398= : >760, 1999) recently showed that local time reversal does not destroy intelligibility, >if the time reversal window is brief. >Why is that? Indeed, this is an excellent question, which - strangely, was not address= ed at all by the authors. Maybe this is due to a poor sensitivity to temporal-envelope phase change= s at high amplitude-modulation rates. Dau (1996) showed that we are sensitive to phase changes for low-sine modulation rates only (< 10 Hz); Patterson and coll. (Patterson, 1994; Akeroyd & Patterson (1997) also showed that sensitivity to envelope time-reversal degraded at high envelope rates. ______________________ Christian Lorenzi Equipe Perception Auditive Laboratoire de Psychologie Experimentale UMR 8581 CNRS-Universit=E9 Paris V Institut de Psychologie Universite Paris V 71, Avenue Edouard Vaillant 92774 Boulogne-Billancourt C=E9dex France phone: + 33 1 55.20.57.34 Fax: + 33 1 55.20.58.54