Expectation of having consumed caffeine can improve performance and mood

Dawkins, Lynne and Shahzad, Fatima-Zahra and Ahmed, Suada S. and Edmonds, Caroline J. (2011) ‘Expectation of having consumed caffeine can improve performance and mood’, Appetite, 57(3), pp. 597-600. (doi:10.1016/j.appet.2011.07.011).

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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.

Item Type: Article
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..
Divisions: Schools > Psychology, School of
Depositing User: Mr Stephen Grace
Date Deposited: 18 Nov 2011 15:35
Last Modified: 19 Aug 2013 12:09
URI: http://hdl.handle.net/10552/1347

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