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How it varies between people

3 figures covering how it varies between people, fastest first.

What Typical Range Kind What is measured
How reaction time changes with age 250 ms 190 ms–400 ms Reaction Simple visual reaction across the lifespan, from childhood to old age.
What sleep loss does to reaction time 300 ms 250 ms–600 ms Reaction Simple visual reaction after extended wakefulness or restricted sleep.
What alcohol does to reaction time 320 ms 260 ms–500 ms Reaction Simple and choice reaction at blood alcohol concentrations around the common legal driving limits.

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