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Average human visual reaction time is 200–250 ms. Simple reaction time (one stimulus, one response) is faster than choice reaction time (multiple stimuli). Fatigue, caffeine, and age affect performance. Athletes typically achieve 150–200 ms. F1 drivers react in 150–200 ms. Reflexes (like knee-jerk) bypass the brain entirely and are faster (~50 ms). Multiple trials give more reliable averages.