Abstract
The effects exerted by electrical stimulation of the locus coeruleus (LC) on neuronal activity in the visual cortex have been studied in acute experiments on rabbits. The pattern of cortical afterprocesses affecting poststimulus histograms of neuronal activity has been found not always to correspond to the direction of change in the neuronal excitation level in the period of LC stimulation. An analysis of crossed interval histograms for a pair of neurons located in the same microvolume of the cortex has revealed the existence of two independent postsynaptic effects of LC stimulation: a “fast” (synaptic) effect and a “slow” (modulatory) effect. The findings are discussed with allowance for morphological features of the synaptic connections and interneuronal transmission in the noradrenergic system of the brain.
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