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This is discused in further detail on the the statistics page. While an average human reaction time may fall between 200-250ms, your computer could be adding 10-50ms on top. Some modern TVs add as much as 150ms! If you want, you can keep track of your scores, and see your full history of reaction times.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing. Transient attention is a short-term response to a stimulus that temporarily attracts/distracts attention. 2  Researchers disagree on the exact amount of human transient attention span; some say it may be as short as 8 seconds.