Re: harmonic vs. inharmonic sounds (one last time)

[Erik Larsen <elarsen@xxxxxxx>]

Dear Martin,

without having read the papers, I wonder how you can conclude that pitch 
shift induced by a drug rules out _any_ pitch extraction mechanism. 
Perhaps it makes a case for a role of periodicity extraction (because 
drugs are unlikely to alter the tonotopic representation in the cochlea, 
I suppose that is the argument), but any CNS effect of these drugs could 
affect pitch extraction in the CNS, regardless of its peripheral basis.

Erik

--
Erik Larsen, Ph.D. candidate
Speech and Hearing Bioscience and Technology
Harvard-MIT Division of Health Sciences and Technology
Cambridge MA 02139
http://web.mit.edu/shbt

Martin Braun wrote:
> Dear Al and others,
>
> Al Bregman wrote:
>
> > I have framed the explanation in terms of repetition rate because it
> > was easy to do, but it might not be correct.  For example a "harmonic
> > sieve" or template, might derive pitch.
>
> We have detailed data on pitch shift caused by the medical drug
> carbamazepine. These data exclude the possibility of pitch extraction
> via a ' "harmonic sieve" or template '.
>
> These data are compatible, however, with the concept of pitch extraction 
> via
> tuned periodicity detectors.
>
>
> Chaloupka, V., Mitchell, S., Muirhead, R., 1992. Observation of a
> medication-induced change in pitch perception. J. Acoust. Soc. Am. 91,
> 2436-2437.
>
> Chaloupka, V., Mitchell, S., Muirhead, R., 1994. Observation of a
> reversible, medication-induced change in pitch perception. J. Acoust. Soc.
> Am. 96, 145-149.
>
> Braun, M., Chaloupka, V., 2005. Carbamazepine induced pitch shift and 
> octave
> space representation. Hear. Res. 210, 85-92.
>
>
> Martin
>
> ---------------------------------------------------------------------
> Martin Braun
> Neuroscience of Music
> S-671 95 Klässbol
> Sweden
> web site: http://w1.570.telia.com/~u57011259/index.htm

--
Erik Larsen
PhD candidate Speech and Hearing Bioscience and Technology
http://web.mit.edu/shbt

Prediction is very difficult, especially of the future.
		-- Niels Bohr