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Theta and gamma oscillations are thought to provide signal sets that promote neural coding of cognitive processes. Over 40 yrs ago, Jeffrey Gray reported event‐related changes in a narrow band of hippocampal theta (7.5–8.5 Hz) which appeared to involve norepinephrine (NE) release from, the noradrenergic nucleus, the locus coeruleus (LC). These event‐related alterations in EEG were elicited by novelty,...
Norepinephrine in the hippocampus of urethane anesthetized rats was monitored by microdialysis prior to, and following, an intracerebroventricular injection of 5 μg [−]NE in 2 μl of ACSF. The perforant path evoked potential in dentate gyrus was concurrently monitored by a microelectrode adjacent to the dialysis probe. NE levels 30 X basal values or greater at the recording site were related to long-lasting...
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