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Acute caffeine effect on repeatedly measured P300.

J Pan1, T Takeshita, K Morimoto

  • 1Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Osaka.

Environmental Health and Preventive Medicine
|March 25, 2011
PubMed
Summary

Caffeine intake reduces P300 brainwave amplitude and latency during an auditory task. This suggests caffeine enhances attention allocation and reduces cognitive load in coffee drinkers.

Keywords:
P300caffeineevent-related brain potential (ERP)oddballrepeated measurement

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychopharmacology

Background:

  • The P300 event-related potential (ERP) is a neurophysiological measure sensitive to attention and cognitive processing.
  • Caffeine is a widely consumed psychoactive substance known to affect cognitive functions.

Purpose of the Study:

  • To investigate the acute effects of a single caffeine dose on the P300 ERP component.
  • To examine how caffeine influences attentional resource allocation during a sustained cognitive task.

Main Methods:

  • A double-blind, placebo-controlled study was conducted with regular coffee drinkers.
  • Participants received either 5mg/kg body-weight caffeine or placebo in decaffeinated coffee after a 24-hour abstinence period.
  • An auditory oddball button-press task was used to elicit P300 responses, with sessions counterbalanced and separated by 2-4 weeks.

Main Results:

  • Caffeine administration resulted in significantly smaller P300 amplitudes compared to the placebo.
  • Caffeine also led to a shorter P300 latency.
  • The difference in P300 amplitude between caffeine and placebo conditions increased across successive trial blocks.

Conclusions:

  • Acute caffeine ingestion appears to reduce cognitive resource consumption during demanding tasks.
  • Caffeine enhances the allocation of attentional resources, leading to improved task performance over time.
  • These findings highlight caffeine's role in modulating neural processes underlying attention and cognitive efficiency.