Influence of caffeine on selective attention in well‐rested and fatigued subjects

Psychophysiology - Tập 31 Số 6 - Trang 525-534 - 1994
Monicque M. Lorist1, J. Snel, Albert Kok, G. Mulder
1Department of Psychonomics, University of Amsterdam, The Netherlands

Tóm tắt

AbstractEffects of caffeine were studied in a visual focused selective search task in well‐rested and fatigued subjects. A dose of 200 + 50 mg caffeine or placebo, dissolved in decaffeinated coffee, was administered in a double‐blind and deceptive fashion. The task was to detect a target letter on one diagonal of a visual display designated as relevant and ignore stimuli presented on the irrelevant diagonal. Behavioral measures were supplemented by event‐related potential (ERP) measures. Subjects reacted faster in the caffeine condition. Caffeine enhanced the N1 and the N2b components. Selection of relevant information apparently was more adequate in this condition. Search negativity was not affected by caffeine. Caffeine effects on the P3 elicited by target letters were more pronounced in the fatigued than in the well‐rested subjects, indicating that the effects of caffeine are dependent on the state of the subject. The results suggest that caffeine has specific rather than general effects on information processing.

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Psychophysiology

Tập 31 Số 6

525-534

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