Subject: Technical report available on neural oscillators for ASA From: Guy Brown <G.Brown(at)dcs.shef.ac.uk> Date: Fri, 4 Oct 1996 15:12:10 +0100A new technical report is available by FTP: MODELLING THE PERCEPTUAL SEGREGATION OF DOUBLE VOWELS WITH A NETWORK OF NEURAL OSCILLATORS Guy J. Brown (1) and DeLiang Wang (2) (1) Department of Computer Science, University of Sheffield, 211 Portobello Street, Sheffield S8 0ET, UK Email: guy(at)dcs.shef.ac.uk (2) Laboratory for AI Research, Department of Computer Science and Information Science and Center for Cognitive Science, The Ohio State University, Columbus, OH 43210-1277, USA Email: dwang(at)cis.ohio-state.edu ABSTRACT The ability of listeners to identify two simultaneously presented vowels can be improved by introducing a difference in fundamental frequency (F0) between the vowels. We propose an explanation for this phenomenon in the form of a computational model of concurrent sound segregation, which is motivated by neurophysiological evidence of oscillatory firing activity in the auditory cortex and thalamus. More specifically, the model represents the perceptual grouping of auditory frequency channels as synchronised (phase-locked with zero phase lag) oscillations in a neural network. Computer simulations on a vowel set used in psychophysical studies confirm that the model qualitatively matches the performance of human listeners; vowel identification performance increases with increasing difference in F0. Additionally, the model is able to replicate other findings relating to the perception of harmonic complexes in which one component is mistuned. OBTAINING THE REPORT BY FTP The report is available by anonymous FTP from the site ftp.dcs.shef.ac.uk (enter the word "anonymous" when you are asked for a login name). Then enter: cd /share/spandh/pubs/brown followed by get bw-report96.ps.Z The file is 2910288 bytes of compressed postscript. If you have trouble downloading or viewing the file, or if you would like a paper copy to be sent to you, please email me (guy(at)dcs.shef.ac.uk) --- Dr. Guy J. Brown Department of Computer Science University of Sheffield Regent Court 211 Portobello Street Sheffield S1 4DP United Kingdom Email: guy(at)dcs.shef.ac.uk Tel: (+44) 0114 2825568 Fax: (+44) 0114 2789072