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Article 6266 of comp.ai.philosophy:
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>From: dario@wotan.cns.nyu.edu (Dario Ringach)
Newsgroups: comp.ai.philosophy
Subject: Re: Spectral Data Processing in the Brain
Keywords: coherent Fourier phase power spectrum
Message-ID: <1992Jun16.000131.23438@wotan.cns.nyu.edu>
Date: 16 Jun 92 00:01:31 GMT
References: <632@trwacs.fp.trw.com>
Organization: Center for Neural Science,New York University,New York
Lines: 23

In article <632@trwacs.fp.trw.com> erwin@trwacs.fp.trw.com (Harry Erwin) writes:
>Owls are known to use narrow-band spectral data
>in the processing of sound. This appears to be power;
>is there any evidence of phase data being generated/
>used in any species?
>--
>Harry Erwin
>Internet: erwin@trwacs.fp.trw.com

Many aspects of echolocation are based on phase information.  If you
present a pure tone to each ear, for example, the perception of the
sound's direction will be determined by the phase between the signals.
It seems that phase info in audition is processed at the level of the
brainstem by means of a cross-correlation analysis.  See, for example:
J. O. Pickles, "An Introduction to the Physiology of Hearing", 2nd Ed,
Academic Press, 1988.

--
Dario
-- 
Dario Ringach				office: (212) 998-3941
Center for Neural Science		home:   (212) 727-3941
New York University			e-mail: dario@cns.nyu.edu


