Fig. 1.

Typical action potential firing of choline acetyltransferase-positive (ChAT⁺) neurons and choline acetyltransferase-negative (ChAT^-) neurons in the basal forebrain (BF) under whole-cell recordings. The spikes were induced by stimuli that were the same in intensity and duration under current-clamp recordings on ChAT⁺ neurons and ChAT^- neurons in the BF. a The recorded spike trace illustrates the electrophysiologic properties of a ChAT⁺ neuron. b The recorded spike trace illustrates the electrophysiologic properties of a ChAT^- neuron