Subject: manuscript in press From: Claude Alain <calain(at)ROTMAN-BAYCREST.ON.CA> Date: Thu, 25 Jan 2001 15:25:29 -0800For those interested, I would be happy to send out a draft copy of a manuscript currently in press in JEP:HPP. Alain, C., Arnott, S R, & Picton, T. W. Bottom-up and top-down influences on auditory scene analysis: Evidence from event-related brain potentials The physiological processes underlying the segregation of concurrent sounds were investigated using event-related brain potentials. The stimuli were complex sounds containing multiple harmonics, one of which could be "mistuned" so it was no longer an integer multiple of the fundamental. The perception of concurrent auditory objects increased with the degree of mistuning, and was accompanied by negative and positive waves that peaked at 180 and 400 ms post-stimulus respectively. The negative wave, referred to as the =93object-related negativity=94, was present during passive listening but the positive wave was not present. These findings indicate bottom-up and top-down influences during auditory scene analysis. Brain electrical source analyses showed that distinguishing simultaneous auditory objects involved a widely distributed neural network that included auditory cortices, medial temporal lobe and posterior association cortices. Claude (calain(at)rotman-baycrest.on.ca)