Re: Pitch neurons (was "Autocorrelation-like ...") (Martin Braun )


Subject: Re: Pitch neurons (was "Autocorrelation-like ...")
From:    Martin Braun  <nombraun(at)TELIA.COM>
Date:    Wed, 5 Mar 2003 22:49:52 +0100

Nikolay G. Bibikov asked: > My question is very simple. > Who really observed a central auditory units with internal periodicity? ....... > To see a real unit with internal periodicity I would like to observe a > periodicity in spontaneous activity or in hasard fubction of evoked > activity or at last in latency distibution. The first two facts have been observed 10 years ago, the third fact 16 years ago. In Braun (1999) you can read the following two paragraphs: "The most comprehensive evidence for tuned neural resonance, to date, was found by Schwarz et al. (1993) in the auditory midbrain of a bird, the chicken. After surgical removal of both cochleae 37 oscillating cells were recorded. Three response modes revealed identical neuron-specific preferred frequencies from 60 to 840 Hz: (1) spontaneous firing, (2) firing upon a 0.1 ms electrical impulse applied at the cochlear nerve, and (3) firing upon a random sequence (Poisson, mode 2-3 ms) of 0.1 ms electrical pulses, also applied at the cochlear nerve." "Langner et al. (1987) further showed that onset latency systematically decreased with increasing BMF [best modulation frequency]. They suggested that characteristic resonant periods would explain both the BMF effect and the latency effect." > The only hints about sach effects I could see in some G.Langner studies, > which have done mainly on guinea foul. Most of Langner's data are from the cat. Schwarz, D.W.F., Dezs÷, A., Neufeld, P.R., 1993. Frequency selectivity of central auditory neurons without inner ear. Acta Otolaryngol. (Stockh.) 113, 266-270. Langner, G., Schreiner, C.E., Merzenich, M.M., 1987. Covariation of latency and temporal resolution in the inferior colliculus of the cat. Hear. Res. 31, 197-201. Braun, M., 1999. Auditory midbrain laminar structure appears adapted to f0 extraction: further evidence and implications of the double critical bandwidth. Hear. Res. 129, 71-82. Martin ------------------------------------------- Martin Braun Neuroscience of Music S-671 95 Klassbol Sweden e-mail: nombraun(at)telia.com web site: http://w1.570.telia.com/~u57011259/index.htm


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