The effects of acute intraseptal injection of haloperidol in vivo on hippocampal cholinergic function in the mouse.

Acute injection of haloperidol into the lateral septum in mice produced an immediate and long-lasting increase in hippocampal sodium-dependent high-affinity choline uptake. Parallel electrophysiological investigations revealed that the increased septo-hippocampal cholinergic activity augmented CA1 pyramidal cell excitability and also accelerated the extinction of a conditioned reinforcement. These results constitute further evidence that septal dopaminergic terminals, via their control of septo-hippocampal cholinergic activity play a significant role in the modulation of hippocampal function.