Re: Why is high high? (Harry Erwin )

Subject: Re: Why is high high?
From:    Harry Erwin  <herwin(at)OSF1.GMU.EDU>
Date:    Thu, 27 Aug 1998 14:51:34 -0400

The human and bat literature discuss elevation estimation based on the movement of a 'notch' in wide-band intensity spectra. This notch, a band of frequencies where the intensity is weaker than usual, is created by multipath interference in the pinnae. The upper and lower boundaries of this notch change with elevation, and there is experimental evidence that elevation may be estimated in humans by detecting the notch movement relative to the background spectrum. The effect of the notch movement is apparently to make high-pitched sounds sound high and low-pitched sounds sound low. I'm investigating a slightly different but related hypothesis in my dissertation research, but do not have conclusive results as yet. Harry Erwin, Internet: herwin(at), Web Page: Senior Software Analyst supporting the FAA, PhD candidate in computational neuroscience--modeling how bats echolocate--and lecturer for CS 211 (data structures and advanced C++). Email to AUDITORY should now be sent to AUDITORY(at) LISTSERV commands should be sent to listserv(at) Information is available on the WEB at

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