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If you've ever wondered whether your brain can quickly process visual information or not, this simple quiz is for you! The rule is very simple: When the red circle turns green, tap/click the left mouse button on the screen as fast as possible!
The average reaction time to visual stimulus is around 250ms (milliseconds) and most people are able to achieve up to 200ms with a bit of training. The fastest documented reaction time to visual stimulus is 120 milliseconds, which is an extremely difficult record to beat. If you believe you've got what it takes to do better, feel free to upload a video of you doing this test on Youtube and send us the link. You can retake this test as many times as you want with no impact on your final score!