Subject: Re: The Auditory Continuity Illusion/Temporal Induction From: Stephen Grossberg <steve(at)CNS.BU.EDU> Date: Thu, 15 Dec 2005 10:55:04 -0500Dear All, The following neural modeling article, which is relevant to the group discussion of the auditory continuity illusion, including how the brain may cope with noise, can be downloaded from my web page http://www.cns.bu.edu/Profiles/Grossberg : Grossberg , S., Govindarajan, K.K., Wyse, L.L. , and Cohen, M.A. (2004). ARTSTREAM: A neural network model of auditory scene analysis and source segregation. Neural Networks, 17, 511-536. Best, Steve Grossberg >X-Virus: scanned by VAMS 2005 version 8.984 from Tue Dec 13 14:34:23 2005 CET >Date: Wed, 14 Dec 2005 08:28:35 +0200 >Reply-To: Israel Nelken <israel(at)MD.HUJI.AC.IL> >Sender: AUDITORY Research in Auditory Perception <AUDITORY(at)LISTS.MCGILL.CA> >From: Israel Nelken <israel(at)MD.HUJI.AC.IL> >Subject: Re: The Auditory Continuity Illusion/Temporal Induction >Comments: To: Al Bregman <al.bregman(at)MCGILL.CA> >To: AUDITORY(at)LISTS.MCGILL.CA >X-Keywords: > >Dear all, > There's some electrophysiological work in animals that has >bearing on the issue of continuity. Mitch Sutter has strong evidence >that the illusion is operative in macaques, and he has some >accompanying electrophysiology (that has not been published yet to >the best of my knowledge) showing correlates of induction in primary >auditory cortex. We (Las et al. J. Neurosci. 2005) published data >related to the coding of a pure tone in fluctuating masker. Although >our main emphasis was on comodulation masking release, the results >can be interpreted in terms of continuity. In short, the responses >of neurons in A1 of cats to the interrupted noise were very strong >and locked to the noise envelope. Adding a low-level tone close to >the BF of the neurons suppressed the envelope locking, resulting in >responses that were similar to those evoked by tones in silence. >Thus, these neurons seem to reflect the perceived continuity of the >tone, ignoring the noise. We have further demonstrated that neurons >with these responses are present in the auditory thalamus but not in >the inferior colliculus. All of this would suggest that activity >that reflects the continuity of the tone is already present in >thalamus/primary auditory cortex (although anesthetized cats are >certainly not awake humans). We don't know however whether this >activity is generated there or whether we see a reflection of >processing at higher brain areas. > Eli > >-- >================================================================== >Israel Nelken >Dept. of Neurobiology >The Alexander Silberman Institute of Life Sciences >Edmond Safra Campus, Givat Ram | Tel: Int-972-2-6584229 >Hebrew University | Fax: Int-972-2-6586077 Jerusalem >91904, ISRAEL | Email: israel(at)md.huji.ac.il >==================================================================