Psychomotor Vigilance Test
Try this game to test your alertness and vigilance.
Instructions: Press start button. Single click on the box as soon as possible after red numbers appear in the box. The red numbers will appear at random times. The test lasts 2 minutes or until you press the Stop button.
Taking the test for the entire 2 minutes allows a more accurate assessment. False starts (response times less than 100 msec) are excluded from final analysis.