Hitting a moving target with a thrown dart requires your brain to coordinate what your eyes see with the motion of your arm, a chain of signals whose total speed is your reaction time. Caffeine is a stimulant that may shorten that neural relay, so comparing balloon hits before and after drinking a large cup of caffeinated coffee tests whether the drug tightens the link between seeing and responding.

Caffeine is a substance in coffee and tea that makes your brain feel more awake and alert. This experiment puts that alertness boost to a practical test. Twenty participants each throw 12 darts at a board of 12 balloons from 5 meters away, recording how many they burst. Then each person drinks a large cup of caffeinated coffee and waits 30 minutes before throwing again at a fresh set of balloons from the same distance. Comparing the before-and-after scores reveals whether the alertness and energy boost from caffeine translates into better hand-eye coordination.

Your brain constantly reads visual information and adjusts the signals it sends to your arm and hand muscles. Caffeine may speed up this visual-to-motor loop by increasing alertness. In this experiment, 20 participants throw 12 darts each at a board of 12 balloons from 5 meters away. Then each person drinks a large cup of caffeinated coffee and waits 30 minutes before throwing again at a fresh set of balloons from the same distance. Comparing before-and-after scores reveals whether caffeine actually boosts how well the brain guides the hands.