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While cholinergic stimulation of the PRF evokes a REM-like state, electrical stimulation of LDT/PPT neurons has not been used to test the hypothesis of mesopontine cholinergic control of REM sleep. Adult cats were implanted for electrographic recording and with bipolar unilateral stimulating electrodes, either in the LDT or within the PRF (stimulation control). Baseline recordings of the normal sleep-wake...
The variations of Acetylcholine (ACh) release in the cerebral cortex and dorsal hippocampus were monitored by microdialysis during the electroencephalographically recorded sleep-waking cycle in freely moving cats. The results show a state-dependent variation in ACh output in both the cortex and the hippocampus. ACh release increased by approximately 100% during quiet waking (QW) and by 175% during...
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