Conditioned effects of caffeine on performance in humans

Physiology & Behavior
Angela AttwoodSuzanne Higgs

Abstract

There is limited evidence for the conditioning of stimulant-like drug effects to previously-neutral stimuli in humans. Two studies tested whether the facilitatory effects of caffeine on cognitive performance can be conditioned to the context of drug administration. In Experiment 1, sixteen participants were divided equally into two groups: one group (the "paired" group) received 250 mg caffeine in a novel beverage prior to completing two computerized performance tests; the other group (the "unpaired" group) received the same beverage without caffeine (i.e. placebo) before testing. After the performance tests, the unpaired group received the caffeinated drink, and the paired group received placebo in a different context from that in which testing had taken place. The performance tests comprised a test of simple reaction time to a visual stimulus and a test of logical reasoning (the semantic verification task). The procedure was repeated over four separate conditioning trials. On a subsequent fifth session, the test for a conditioned response, all participants received placebo before test. Simple reaction time was significantly reduced by caffeine over the four conditioning trials, and on the test for conditioned responding the p...Continue Reading

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Citations

Aug 25, 2011·Alcohol and Alcoholism : International Journal of the Medical Council on Alcoholism·Kulbir Singh BirakPhilip Terry
Sep 13, 2011·Progress in Neurobiology·Geoffrey BurnstockPeter Illes

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