Caffeine in doses equivalent to the contents of one to four cups of coffee has been found to facilitate several aspects of cognitive activity. In this chapter attention will be focused systematically on different aspects of human information processing: sensory activity, perceptual activities, evaluation of incoming information, decision making, central processing of newly received and already present knowledge in the brain, and response-related executive functions. Different types of tasks have been used to address these different cognitive subprocesses, with several doses of coffee or caffeine, in different types of subjects, at different times of day, and with different research protocols and procedures.

This chapter aims at providing relevant information with respect to coffee and caffeine's effects on different aspects of cognitive performance under different conditions.

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