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  • Title: REM latency in neurotic and endogenous depression and the cholinergic REM induction test.
    Author: Berger M, Lund R, Bronisch T, von Zerssen D.
    Journal: Psychiatry Res; 1983 Oct; 10(2):113-23. PubMed ID: 6581488.
    Abstract:
    Latency of rapid eye movement (REM) sleep was measured in eight healthy volunteers under baseline conditions and after administration of physostigmine. An infusion of 0.5 mg of physostigmine 5 minutes after sleep onset caused a significant shortening of REM latency in comparison with baseline conditions. In 45 patients with major depression, REM latency during baseline nights was significantly shorter than in control subjects. This shortening of the REM latency was found to be similar in endogenous, neurotic, and unclassified depressed patients. In contrast to findings in the controls, the physostigmine infusion provoked no further significant reduction of REM latency in depressed patients, but awakened the majority of patients. The data concerning spontaneous REM latency and REM latency after physostigmine do not allow a differentiation among the endogenous, neurotic, and unclassified depressed subgroups. The results of the cholinergic REM induction test do not conclusively support the hypothesis of a cholinergic hypersensitivity in depression.
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