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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-4906

Rimmele, U; Spillmann, M; Bärtschi, C; Wolf, O T; Weber, C S; Ehlert, Ulrike; Wirtz, P H (2009). Melatonin improves memory acquisition under stress independent of stress hormone release. Psychopharmacology, 202(4):663-672.

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RATIONALE: Animal studies suggest that the pineal hormone melatonin influences basal stress hormone levels and dampens hormone reactivity to stress. OBJECTIVES: We investigated whether melatonin also has a suppressive effect on stress-induced catecholamine and cortisol release in humans. As stress hormones affect memory processing, we further examined a possible accompanying modulation of memory function. MATERIALS AND METHODS: Fifty healthy young men received a single oral dose of either 3 mg melatonin (n = 27) or placebo medication (n = 23). One hour later, they were exposed to a standardized psychosocial laboratory stressor (Trier Social Stress Test). During stress, subjects encoded objects distributed in the test room, for which memory was assessed a day later ("memory encoding under stress"). Fifteen minutes following stress, memory retrieval for words learnt the day before was tested ("memory retrieval after stress"). Plasma epinephrine and norepinephrine levels, salivary free cortisol levels and psychological responses (attention, wakefulness) were repeatedly measured before and after stress exposure. RESULTS: Melatonin specifically enhanced recognition memory accuracy of objects encoded under stress (p < 0.001). In contrast, 15 min after stress, when cortisol levels were highest, retrieval of memories acquired the day before was not influenced by melatonin. Moreover, melatonin did not influence stress-induced elevation of catecholamine and cortisol levels which in turn did not correlate with the effects of melatonin on memory. CONCLUSIONS: The findings point to a primary action of melatonin on central nervous stimulus processing under conditions of stress and possibly on memory consolidation and exclude any substantial suppressive action of the substance on hormonal stress responses.


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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:06 Faculty of Arts > Institute of Psychology
Dewey Decimal Classification:150 Psychology
Uncontrolled Keywords:melatonin, memory, recognition, stress, cortisol, norepinephrine, epinephrine
Date:14 March 2009
Deposited On:28 Nov 2008 09:26
Last Modified:05 Apr 2016 12:32
Funders:Research grant 2004 from the University of Zurich (Forschungskredit 2004, to PHW)
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:10.1007/s00213-008-1344-z
PubMed ID:18853147

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