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J Neurophysiol 94: 2667-2675, 2005. First published June 22, 2005; doi:10.1152/jn.00328.2005
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Oscillations in the Olfactory Bulb Carry Information About Odorant History

Michal R. Zochowski1,2,3 and Lawrence B. Cohen1,3

1Yale University School of Medicine, Department of Physiology, New Haven, Connecticut; 2University of Michigan, Department of Physics and Biophysics Research Division, Randall Laboratories, Ann Arbor, Michigan; and 3Marine Biological Laboratory, NeuroImaging Cluster, Woods Hole, Massachusetts

Submitted 30 March 2005; accepted in final form 15 June 2005

While odorant-evoked oscillations in the vertebrate olfactory bulb have been studied extensively, information about their possible cognitive role has been missing. Using voltage-sensitive dye imaging, we show that repeated odorant presentations with interstimulus intervals of 2–12 s had dramatic and diverse effects on the three oscillations that occur in the turtle olfactory bulb. Two of the oscillations are strikingly depressed in response to the second stimulation even of a new odorant was presented. The third oscillation is enhanced if the odorant is the same but suppressed if the odorant is new. The effects suggest that the oscillations carry information about odorant novelty and consistency.

Address for reprint requests and other correspondence: M. Zochowski, Dept. of Physics and Biophysics Research Div., University of Michigan, Randall Laboratories, 500 E. University Ave., Ann Arbor, MI 48109 (E-mail: michalz{at}umich.edu)




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