Definitions of REM latency: some comparisons with particular reference to depression

Unlike sleep stages, which are assessed by standardized criteria, an informal survey by us showed that the definition of REM latency is relatively idiosyncratic. Differences in definition arise for two reasons: Differences in the definition of sleep onset, and the inclusion or exclusion of wakefulne...

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Bibliographic Details
Published inBiological psychiatry (1969) Vol. 17; no. 9; p. 993
Main Authors Knowles, J B, MacLean, A W, Cairns, J
Format Journal Article
LanguageEnglish
Published United States 01.09.1982
Subjects
Adult
Aged
Depressive Disorder - psychology
Depressive Disorder - therapy
Electroencephalography
Female
Humans
Male
Middle Aged
Reaction Time
Sleep, REM
Wakefulness
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Summary:Unlike sleep stages, which are assessed by standardized criteria, an informal survey by us showed that the definition of REM latency is relatively idiosyncratic. Differences in definition arise for two reasons: Differences in the definition of sleep onset, and the inclusion or exclusion of wakefulness that may occur prior to the first REM period. Seven definitions are identified. Each was applied to 70 records taken from 14 depressed patients, 5 remitted depressives, and 5 normal subjects. In all three samples, REM latencies calculated on the basis of the different definitions differed significantly. Reasons for adopting a common definition are discussed. It is suggested that, if established, the reliability and validity (concurrent and predictive) of the available measures would provide an empirical basis for selection.
ISSN:0006-3223