Subject: Re: harmonic vs. inharmonic sounds (one last time) From: Erik Larsen <elarsen@xxxxxxxx> Date: Sat, 17 Mar 2007 09:39:37 -0400 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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