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The Journal of Neurophysiology Vol. 86 No. 4 October 2001, pp. 1869-1876
Copyright ©2001 by the American Physiological Society
Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803
Nikonov, Alexander A. and
John Caprio.
Electrophysiological Evidence for a Chemotopy of Biologically
Relevant Odors in the Olfactory Bulb of the Channel Catfish. J. Neurophysiol. 86: 1869-1876, 2001. Extracellular electrophysiological recordings from single olfactory
bulb (OB) neurons in the channel catfish, Ictalurus
punctatus, indicated that the OB is divided into different
functional zones, each processing a specific class of biologically
relevant odor. Different OB regions responded preferentially at
slightly above threshold to either a mixture of 1) bile
salts (10-7 to 10
5 M
Na+ salts of taurocholic, lithocholic, and
taurolithocholic acids), 2) nucleotides
[10-6 to 10-4 M
adenosine-5'-triphosphate (ATP), inosine-5'-monophosphate
(IMP), and inosine-5'-triphosphate (ITP)], or 3)
amino acids (10-6 to
10-4M L-alanine,
L-methionine, L-arginine, and
L-glutamate). Excitatory responses to bile salts were
observed primarily in a thin, medial strip in both the dorsal (100-450
µm) and ventral (900-1,200 µm) OB. Excitatory responses to
nucleotides were obtained primarily from dorsal, caudolateral OB,
whereas excitatory responses to amino acids occurred more rostrally in
the dorsolateral OB, but continued more medially in the ventral OB. The
chemotopy within the channel catfish OB is more comparable to that
previously described by optical imaging studies in zebrafish than by
field potential studies in salmonids. The present results are
consistent with recent studies, suggesting that the specific spatial
organization of output neurons in the OB is necessary for the quality
coding/decoding of olfactory information.
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