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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.

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School of Psychology, University of East London, Stratford Campus, Water Lane, Stratford, London E15 4NO, United Kingdom.


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.

[Indexed for MEDLINE]

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