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Re: Pitch orientation-discriminating feature detectors?
The oldest work, based on my recollection, is likely to be
- Whitfield, I. C. a. E., E.F. (1965). Responses of auditory cortical
neurones to stimuli of changing frequency. Journal of Neurophysiology,
28, 655-672.
who I think were the first to report FM sensitivity in auditory
neurons.
More complex cells with direction selectivity across several tones have
also been reported by Weinberger in several papers (sorry, I don't have
the references handy)
Behaviorally, Peretz describes one person with congenital amusia who has
a much higher threshold for descending than for ascending musical
intervals
- Peretz, I., Ayotte, J., Zatorre, R.J., Mehler, J., Ahad, P., Penhune,
V.B., and Jutras, B. (2002) Congenital amusia: A disorder of fine-grained
pitch discrimination. Neuron, 33, 185-191.
and finally, in our own lab, we've documented that certain specific
auditory cortex lesions lead to an increased threshold for determining
the direction of pitch change, but not for making a same/different
judgment.
- Johnsrude, I.J., Penhune, V.B., and Zatorre, R.J. (2000) Functional
specificity in right human auditory cortex for perceiving pitch
direction. Brain, 123, 155-163.
all of which would tend to suggest that pitch directionality is
relevant, to say the least.
At 23:00 16/09/02 -0400, you wrote:
Dear list,
Do we happen to know of anything indicating the existence of
pitch-orientation selective cells in any species, eg
cell-assemblies
responding specifically to, say, upward moving pitch, rather than
downward movement?
A further question: do we happen to know whether pitch difference
sensitivity responds to orientation of movement?
Many thanks for any pointers.
-- eliot
---
Eliot Handelman PhD
Montreal, Canada
**NOTE**
Please use new e-mail address from now on:
robert.zatorre@mcgill.ca
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Robert J. Zatorre, Ph.D.
Montreal Neurological Institute
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phone: 1-514-398-8903
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