Journal
CLINICAL PSYCHOLOGY REVIEW
Volume 26, Issue 6, Pages 679-694Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cpr.2006.07.001
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The social zeitgeber theory [Ehlers, C. L., Frank, E., & Kupfer, D. J. (198 8). Social zeitgebers and biological rhythms. Archives of General Psychiatry, 45, 948-952] offers an explanation of how life events trigger depressive episodes. According to this theory, life stress leads to mood episodes by causing disruptions in individuals' social routines and, in turn, their biological circadian rhythms. In this article, we review the literature pertaining to the social zeitgeber theory, as well as evidence that this theory may be applied to (hypo)manic episodes. Given the limited data supporting the social zeitgeber theory to date, we also evaluate whether circadian rhythm disruptions are triggered by an internal mechanism, such as an abnormality in one's pacemaker (the suprachiasmatic nucleus; SCN). We review these two theories in an attempt to understand the potential causes of circadian rhythm disruptions and affective episodes in individuals with unipolar and bipolar disorders. We also propose several areas of future research. (c) 2006 Elsevier Ltd. All rights reserved.
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