Caffeine expectancies but not caffeine reduce depletion-induced aggression

Denson, Thomas F., Jacobson, Mandi, von Hippel, William, Kemp, Richard I. and Mak, Tinnie (2012) Caffeine expectancies but not caffeine reduce depletion-induced aggression. Psychology of Addictive Behaviors, 26 1: 140-144. doi:10.1037/a0024725

Author Denson, Thomas F.
Jacobson, Mandi
von Hippel, William
Kemp, Richard I.
Mak, Tinnie
Title Caffeine expectancies but not caffeine reduce depletion-induced aggression
Journal name Psychology of Addictive Behaviors   Check publisher's open access policy
ISSN 0893-164X
Publication date 2012-03
Sub-type Article (original research)
DOI 10.1037/a0024725
Volume 26
Issue 1
Start page 140
End page 144
Total pages 5
Place of publication Washington, DC, United States
Publisher American Psychological Association
Collection year 2013
Language eng
Abstract Caffeine is the most widely consumed central nervous system stimulant in the world, yet little is known about its effects on aggressive behavior. Individuals often consume caffeine to increase energy and ward off mental depletion. Because mental depletion increases aggression when people are provoked, caffeine might reduce aggression by ameliorating the negative effects of depletion. In 2 experiments, participants consumed a 200-mg caffeine tablet or a placebo, were mentally depleted or not, and then provoked and given the opportunity to retaliate with a blast of white noise. Results showed that consuming a placebo reduced aggression relative to both caffeine (Experiments 1 and 2) and a no-pill control condition (Experiment 2). These data suggest that expectancies about the effects of caffeine in the absence of the pharmacological effects of the drug can reduce aggression when mentally depleted.
Keyword Aggression
Placebo effect
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Psychology Publications
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Created: Sun, 14 Apr 2013, 10:33:00 EST by Mrs Alison Pike on behalf of School of Psychology