Caffeine Boosts Preparatory Attention for Reward-related Stimulus Information

Berry van den Berg*, Marlon de Jong, Marty G. Woldorff, Monicque M. Lorist

*Corresponding author for this work

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Abstract

The intake of caffeine and the prospect of reward have both been associated with increased arousal, enhanced attention, and improved behavioral performance on cognitive tasks, but how they interact to exert these effects is not well understood. To investigate this question, we had participants engage in a two-session cued-reward cognitive task while we recorded their electrical brain activity using scalp electroencephalography. The cue indicated whether monetary reward could be received for fast and accurate responses to a color-word Stroop stimulus that followed. Before each session, participants ingested decaffeinated coffee with either caffeine (3-mg/kg bodyweight) or placebo (3-mg/kg bodyweight lactose). The behavioral results showed that both caffeine and reward-prospect improved response accuracy and speed. In the brain, reward-prospect resulted in an enlarged frontocentral slow wave (contingent negative variation, or CNV) and reduced posterior alpha power (indicating increased cortical activity) before stimulus presentation, both neural markers for preparatory attention. Moreover, the CNV enhancement for reward-prospect trials was considerably more pronounced in the caffeine condition as compared to the placebo condition. These interactive neural enhancements due to caffeine and reward-prospect were mainly visible in preparatory attention activity triggered by the cue (CNV). In addition, some interactive neural enhancements in the processing of the Stroop target stimulus that followed were also observed. The results suggest that caffeine facilitates the neural processes underlying attentional preparation and stimulus processing, especially for task-relevant information.

Original languageEnglish
Pages (from-to)104-118
Number of pages15
JournalJournal of Cognitive Neuroscience
Volume33
Issue number1
Early online date28-Sep-2020
DOIs
Publication statusPublished - Jan-2021

Keywords

  • CONTINGENT NEGATIVE-VARIATION
  • COLOR-WORD INTERFERENCE
  • CENTRAL-NERVOUS-SYSTEM
  • HUMAN-PERFORMANCE
  • ADENOSINE
  • BRAIN
  • TASK
  • MECHANISMS
  • RECEPTORS
  • PRESTIMULUS

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