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Science 7 January 1972:
Vol. 175. no. 4017, pp. 84 - 87
DOI: 10.1126/science.175.4017.84
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Articles

Olfactory Bulb Units: Activity Correlated with Inhalation Cycles and Odor Quality

Foteos Macrides 1 and Stephan L. Chorover 1

1 Department of Psychology, Massachusetts Institute of Technology, Cambridge 02139

Single olfactory bulb units were studied in two macrosmatic species of rodents under conditions intended to preserve the cyclical stimulation which normally accompanies nasal breathing. Patterns of unit activity related to the inhalation cycle were observed in all animals, often in the absence of specific stimuli, and could not be explained in simple mechanical terms. Distinctive changes in these patterns occurred in response to certain odors, and were generally independent of changes in the overall firing frequency. These findings indicate that a change in the overall firing frequency of unit discharges is neither a necessary nor sufficient measure of responsiveness to odors in the rodent olfactory bulb, and that stimulus-specific temporal distributions of unit firing may be involved in olfacto-endocrine activities.


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