Effect of Caffeine on Attention and Alertness Measured in a Home-Setting, Using Web-Based Cognition Tests

Area of Science:

• Nutritional Neuroscience
• Cognitive Psychology
• Human Factors Research

Background:

• Growing interest in ecological validity for lifestyle and nutritional intervention studies.
• Increasing feasibility due to advancements in self-test devices.
• Reproducing clinical findings in realistic home settings.

Purpose of the Study:

• To replicate caffeine's effects on attention and alertness in a home environment.
• Utilizing a web-based platform for remote cognitive testing.
• Assessing the viability of at-home studies for nutritional interventions.

Main Methods:

• Randomized, placebo-controlled, double-blind, crossover design.
• Participants consumed coffee (caffeinated or placebo) at home.
• Web-based cognitive tests measuring attention and alertness were performed before and after consumption.

Main Results:

• High completion rate (80%) for at-home testing, indicating feasibility.
• Significant improvement in reaction time on the Go-No Go test with caffeine, consistent with clinical studies (P=.02).
• Approximately 10% faster performance on coding and N-back tests, with no change in accuracy.

Conclusions:

• At-home cognitive testing effectively reproduces caffeine's stimulant effects on attention and reaction time.
• This methodology provides a fast, reliable, and economical alternative to traditional clinical trials for evaluating interventions.
• Supports the use of ecological validity in nutritional and lifestyle research.