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The effects of caffeine on visual selective attention to color: an ERP study.

Authors
  • Ruijter, J
  • De Ruiter, M B
  • Snel, J
Type
Published Article
Journal
Psychophysiology
Publication Date
Jul 01, 2000
Volume
37
Issue
4
Pages
427–439
Identifiers
PMID: 10934901
Source
Medline
License
Unknown

Abstract

Event-related potentials were recorded from 11 subjects after ingesting caffeine (250 mg) or placebo. Subjects were instructed to attend selectively to stimuli with a specified color (red or blue) in order to react to the occurrence of a target within the attended category. Reaction times revealed faster responses for the caffeine condition, whereas no differences in strategy were observed. Color attention effects were identified as frontal selection positivity, occipital selection negativity, and N2b, whereas target detection was reflected in P3b. Effects of treatment were found as a more positive-going frontal P2 component in the caffeine condition. In addition, an interaction between attention and treatment could be observed on the N2b component. This pattern of results suggests that caffeine yields a higher overall arousal level, more profound processing of both attended and unattended information, and an acceleration of motor processes.

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