Chem. Senses 26: 585-594,
2001
© Oxford University Press 2001
SYMPOSIUM: AChemS XXII Symposium |
Neuromodulation and the Functional Dynamics of Piriform Cortex
Department of Neurobiology and Behavior, Cornell University, 245 Seeley G. Mudd Hall, Ithaca, NY 14853 and 1 Department of Psychology, Program in Experimental and Computational Neuroscience and Center for BioDynamics, Boston University, 64 Cummington Street, Boston, MA 02215, USA
Correspondence to be sent to: Christiane Linster, Department of Neurobiology and Behavior, Cornell University, 245 Seeley G. Mudd Hall, Ithaca, NY 14853, USA. e-mail: cl224{at}cornell.edu
Abstract
Acetylcholine and norepinephrine have a number of effects at the cellular level in the piriform cortex. Acetylcholine causes a depolarization of the membrane potential of pyramidal cells and interneurons, and suppresses the action potential frequency accommodation of pyramidal cells. Acetylcholine also has strong effects on synaptic transmission, suppressing both excitatory and inhibitory synaptic transmission. At the same time as it suppresses synaptic transmission, acetylcholine enhances synaptic modification, as demonstrated by experiments showing enhancement of long-term potentiation. Norepinephrine has similar effects. In this review, we discuss some of these different cellular effects and provide functional proposals for these individual effects in the context of the putative associative memory function of this structure.
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