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At the end of the test, You will see a score on the right called Average showing your average reaction time in milliseconds. The lower this number is, the better, like a golf score. Practice to see if you can improve   A millisecond is 1/1000th of a second. In several studies, scientists have associated better than average reaction times to longevity. This exercise also measures your ability to choose correctly. The Green check marks indicate when you answered correctly. The red-slashed circles indicate an incorrect guess on the origin of the light. Practice to improve your ability to detect light and motion at the edge of your vision, improving your attentiveness. Of interest to people concerned with maintaining their brain.   
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