Abstract
The electrophysiological properties of septo-hippocampal (SHNs) and basalo-cortical neurons (BCNs) identified by antidromic stimulation were compared in rats anesthetized with urethane. SHNs and BCNs had comparable conduction velocities (about 2–3 m/s) and relatively high spontaneous firing rates (about 20 impulses/s). In contrast, they differed in their pattern of spontaneous discharge as studied by generating inter-spike interval histograms. Many BCNs had a regular pattern of discharge. Among SHNs, about 40% had a spontaneous rhythmically bursting pattern of discharge, whereas the remaining 60% had a more or less irregular pattern. These results suggest that SHNs represent a more heterogeneous neuronal population than BCNs, and that central cholinergic neurons involved in different systems might also have different properties.
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