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The Journal of Neurophysiology Vol. 81 No. 6 June 1999, pp. 2737-2742
Copyright ©1999 by the American Physiological Society
Department of Psychology and Program in Neuroscience, Harvard University, Cambridge, Massachusetts 02138
Linster, Christiane,
Bradley P. Wyble, and
Michael E. Hasselmo.
Electrical Stimulation of the Horizontal Limb of the Diagonal
Band of Broca Modulates Population EPSPs in Piriform Cortex. J. Neurophysiol. 81: 2737-2742, 1999.
Electrical stimulation of the horizontal limb of the diagonal band of
Broca modulates population EPSPs in piriform cortex. Electrical stimulation of the horizontal limb of the diagonal band of
Broca (HDB) was coupled with recording of evoked potentials in the
piriform cortex. Stimulation of the HDB caused an enhancement of the
late, disynaptic component of the evoked potential elicited by
stimulation of the lateral olfactory tract but caused a suppression of
the synaptic potential elicited by stimulation of the posterior piriform cortex. The muscarinic antagonist scopolamine blocked both
effects of HDB stimulation. The enhancement of disynaptic potentials
could be due to cholinergic depolarization of pyramidal cells, whereas
the suppression of potentials evoked by posterior piriform stimulation
could be due to presynaptic inhibition of intrinsic fiber synaptic
transmission by acetylcholine.
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