Caffeine, extraversion and working memory

Smith, Andrew Paul ORCID: https://orcid.org/0000-0001-8805-8028 2013. Caffeine, extraversion and working memory. Journal of Psychopharmacology 27 (1) , pp. 71-76. 10.1177/0269881112460111

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Abstract

Research has shown that extraverts performing a working memory task benefit more from caffeine than do introverts. The present study aimed to replicate this and extend our knowledge by using a lower dose of caffeine (65 mg) and a range of tasks related to different components of working memory. In addition, tasks assessing psychomotor speed and the encoding of new information were included to determine whether caffeine-extraversion interactions were restricted to working memory tasks. A double-blind design was used, with 128 participants being randomly assigned to caffeinated or de-caffeinated coffee conditions. The results showed that caffeine interacted with extraversion in the predicted direction for serial recall and running memory tasks. Caffeine improved simple reaction time and the speed of encoding of new information, effects which were not modified by extraversion. These results suggest possible biological mechanisms underlying effects of caffeine on cognitive performance.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Psychology
Subjects:	B Philosophy. Psychology. Religion > BF Psychology R Medicine > R Medicine (General)
Uncontrolled Keywords:	Caffeine; extraversion; working memory; simple reaction time; speed of encoding; neurotransmitters
Publisher:	SAGE Publications
ISSN:	0269-8811
Last Modified:	21 Oct 2022 09:57
URI:	https://orca.cardiff.ac.uk/id/eprint/38416

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