What group would most benefit the claim caffeine of his mental awareness and monitor coordination a university research study was conducted to exam how caffeine affects fine motor skills 10 teen girls ages 1418 were given 200 mg of caffeine per day for 30 days 30 minutes after talking to Kathleen each subject to a time fly monitor skills test in which they should’ve 20 small beads in to pegs the grass compares each subject average results on the same test done 30 minutes before after taking the caffeine