Expectation of having consumed caffeine can improve performance and mood

Article


Dawkins, L., Shahzad, Fatima-Zahra, Ahmed, Suada S. and Edmonds, C. 2011. Expectation of having consumed caffeine can improve performance and mood. Appetite. 57 (3), pp. 597-600.
AuthorsDawkins, L., Shahzad, Fatima-Zahra, Ahmed, Suada S. and Edmonds, C.
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.

Keywordscaffeine; mood; expectancy; performance
JournalAppetite
Journal citation57 (3), pp. 597-600
Year2011
Accepted author manuscript
License
CC BY-ND
Web address (URL)http://hdl.handle.net/10552/1347
Publication dates
Print29 Jul 2011
Publication process dates
Deposited18 Nov 2011
Additional information

Citation:
Dawkins, L., Shahzad, F.-Z., Ahmed, S. S. and Edmonds, C. J. (2011) 'Expectation of having consumed caffeine can improve performance and mood'. Appetite, 57(3), pp. 597-600..

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