Abstract
The discharge patterns of tonic and phasic hippocampal formation theta-on cells were recorded in response to systemic administration of cholinergic agents, in urethane-anesthetized rats. Eserine and carbachol resulted in long trains of slow-wave theta and accompanying activation of tonic and phasic theta-on cells. Both slow-wave theta and the characteristic accompanying discharge patterns of theta-on cells were blocked by administration of atropine SO 4, providing evidence that the effects of eserine and carbachol were mediated by muscarinic receptors. The systemic administration of nicotine resulted in 20–30 s of slow-wave theta and during this time, both tonic and phasic theta-on cell discharges were suppressed.
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