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Psychopharmacology

, Volume 234, Issue 19, pp 2971–2978 | Cite as

Melatonin increases reactive aggression in humans

  • Jinting Liu
  • Ru Zhong
  • Wei Xiong
  • Haibo Liu
  • Christoph Eisenegger
  • Xiaolin Zhou
Original Investigation

Abstract

Objective

Melatonin, a hormone released preferentially by the pineal gland during the night, affects circadian rhythms and aging processes. As animal studies have shown that melatonin increases resident-intruder aggression, this study aimed to investigate the impact of melatonin treatment on human aggression.

Methods

In a double-blind, randomized, placebo-controlled between-participant design, 63 healthy male volunteers completed the Taylor Aggression Paradigm (TAP) after oral administration of melatonin or placebo.

Results

We found that when given the opportunity to administer high or low punishments to an opponent, participants who ingested melatonin selected the high punishment more often than those who ingested placebo. The increased reactive aggression under melatonin administration remained after controlling for inhibitory ability, trait aggression, trait impulsiveness, circadian preference, perceptual sensibility to noise, and changes in subjective sleepiness and emotional states.

Conclusion

This study provides novel and direct evidence for the involvement of melatonin in human social processes.

Keywords

Melatonin Reactive aggression Taylor aggression paradigm Antisocial behavior Circadian rhythm 

Notes

Acknowledgments

We thank Professor Drew Dawson and Dr. Xuan Zhou from the University of South Australia for their suggestions on melatonin administration and Dr. Philip Blue for the preparation of the manuscript.

Author contributions

J. L. and R. Z. designed the experiment and analyzed the data, under the supervision of X. Z., J. L., R. Z., and W. X., and H. L. performed the experiment. J. L., C. E., and X. Z. wrote the manuscript.

Compliance with ethical standards

The experiment was performed in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Department of Psychology, Peking University.

Funding

This study was supported by grants from the National Basic Research Program of China (973 Program: 2015CB856400) and National Natural Science Foundation of China (31630034) to Xiaolin Zhou and the National Natural Science Foundation of China (31600928) to Jinting Liu.

Conflict of interests

The authors declared that they had no conflicts of interest.

Supplementary material

213_2017_4693_MOESM1_ESM.doc (168 kb)
ESM 1 (DOC 168 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Shenzhen Key Laboratory of Affective and Social Cognitive ScienceShenzhen UniversityShenzhenChina
  2. 2.Research Centre of Brain Function and Psychological ScienceShenzhen UniversityShenzhenChina
  3. 3.School of Psychological and Cognitive SciencesPeking UniversityBeijingChina
  4. 4.Neuropsychopharmacology and Biopsychology Unit, Department of Basic Psychological Research and Research Methods, Faculty of PsychologyUniversity of ViennaViennaAustria
  5. 5.Beijing Key Laboratory of Behavior and Mental HealthPeking UniversityBeijingChina
  6. 6.PKU-IDG/McGovern Institute for Brain ResearchPeking UniversityBeijingChina

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