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Appetite. 2011 Dec;57(3):597-600. doi: 10.1016/j.appet.2011.07.011. Epub 2011 Jul 29.

Expectation of having consumed caffeine can improve performance and mood.

Author information

1
School of Psychology, University of East London, Stratford Campus, Water Lane, Stratford, London E15 4NO, United Kingdom. l.e.dawkins@uel.ac.uk

Abstract

We explored whether caffeine, and expectation of having consumed caffeine, affects attention, reward responsivity and mood using double-blinded methodology. 88 participants were randomly allocated to 'drink-type' (caffeinated/decaffeinated coffee) and 'expectancy' (told caffeinated/told decaffeinated coffee) manipulations. Both caffeine and expectation of having consumed caffeine improved attention and psychomotor speed. Expectation enhanced self-reported vigour and reward responsivity. Self-reported depression increased at post-drink for all participants, but less in those receiving or expecting caffeine. These results suggest caffeine expectation can affect mood and performance but do not support a synergistic effect.

PMID:
21824504
DOI:
10.1016/j.appet.2011.07.011
[Indexed for MEDLINE]

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