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The Journal of Neurophysiology Vol. 80 No. 2 August 1998,
pp. 998-1001
Copyright ©1998 The American Physiological Society
RAPID COMMUNICATION
Department of Zoology, University of Oklahoma, Norman, Oklahoma 73019
Wilson, Donald A. Synaptic correlates of odor habituation in the rat anterior piriform cortex. J. Neurophysiol. 80: 998-1001, 1998. Responses of anterior piriform cortex layer II/III neurons to both odors and electrical stimulation of the lateral olfactory tract (LOT) were measured with intracellular recordings in urethan-anesthetized, freely breathing rats. Odor-evoked, respiration-entrained postsynaptic potentials (PSPs) rapidly habituated during a 50-s odor stimulus, then spontaneously recovered within 2 min of odor termination. Associated with the decrease in odor-evoked PSP amplitude was a decrease in the monosynaptic excitatory postsynaptic potentials (EPSPs) evoked by electrical stimulation of the LOT. The decrement in LOT-evoked EPSPs recovered with a time course similar to the odor response recovery. These results demonstrate that odor habituation is associated with a decrease in afferent synaptic efficacy in the anterior piriform cortex.
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