Elsevier

Psychiatry Research

Volume 41, Issue 1, January 1992, Pages 65-72
Psychiatry Research

Comparison of the delta EEG in the first and second non-REM periods in depressed adults and normal control

https://doi.org/10.1016/0165-1781(92)90019-YGet rights and content

Abstract

The distribution of period-analyzed delta activity in the first and second non-rapid eye movement (NREM) periods was compared in nine symptomatic depressed outpatients and nine normal controls. The groups did not differ in ratios of delta zero-cross or delta power in the first to the second NREM periods. Further, neither group showed a systematic change in delta count or delta power across the first two NREM periods. Our findings suggest that ratios of delta activity in the first two NREM periods may not systematically differentiate depressed adults from normal subjects.

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    Citation Excerpt :

    Healthy subjects usually show a decrease of delta sleep from the first to the second Non-REM period, whereas no such decline or even an increase was noted in depressive patients. However, Armitage et al. (1992) were unable to confirm an abnormal delta-sleep ratio in depressives. To summarize, in accordance with many of the studies with visually scored SWS who failed to detect differences between depressives and healthy controls, the data base of studies using automated analysis does not give strong support for the inital assumption of the two-process model of reduced SWS or delta-power in depression.

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All authors are affiliated with the University of Texas Southwestern Medical Center at Dallas. Roseanne Armitage, Ph.D., is Assistant Professor of Psychiatry and Psychology, and Director of Clinical Research in the Sleep Study Unit. J. Scott Calhoun, B.A., was a Research Assistant in the Sleep Study Unit. Howard P. Roffwarg, M.D., is Professor and Director in Research in the Department of Psychiatry and Director of the Sleep Study Unit. A. John Rush, M.D., holds the Betty Jo Hay Chair in Psychiatry and is Director of the Mental Health Clinical Research Center.

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