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Caffeine is one of the most widely used stimulants and is thought to enhance cognitive performance. We performed a pharmacological functional magnetic resonance imaging (MRI) study to assess the effect of caffeine on the human attentional process. Healthy adults participated in a single-blind, placebo-controlled crossover study. The subjects took either caffeine (186 mg) or placebo orally and were subjected to MRI. During MRI scanning, the subjects performed the attention network test (ANT), which is designed to measure 3 distinct attentional networks―the alerting, orienting, and executive control networks―in a single task. Subjects given placebo showed activation in posterior cortical areas in the alerting network, parietal and frontal areas in the orienting network, and the anterior cingulate, prefrontal, parietal and occipital cortical areas in the executive

Caffeine's Effects on Attentional Networks in Healthy Subjects: A Pharmacological Functional Magnetic Resonance Imaging Study