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Reaction time: what's normal, how it ages, and whether you can train it

Reaction time is the oldest measurement in experimental psychology — scientists have been timing it since 1868. What counts as fast, why every online test gives you a different number, and what the research says about getting quicker.

Published 2026-08-10 · Sources verified

The oldest experiment in cognitive science

In 1868, Dutch physiologist Franciscus Donders realized something profound: if reacting to a single expected stimulus takes one amount of time, and choosing between stimuli takes longer, the difference must be the duration of the mental work in between. His “subtraction method” — comparing simple reaction time against choice reaction time — effectively founded mental chronometry.[1] The distinction still structures every reaction game: pure speed is one skill; deciding which response, under pressure, is another.

What’s a normal reaction time?

The best-calibrated large study puts mean simple visual reaction time for adults at about 231 milliseconds — roughly 200–220 ms once hardware and display delays are subtracted.[2] Here’s the caveat every leaderboard comparison needs: your keyboard, mouse, display and browser each add tens of milliseconds, so numbers from different websites and devices are not comparable. Online tests routinely report medians well above the lab-calibrated figures for exactly this reason. Compare yourself to yourself, on the same device — that trend is real even when the absolute number is inflated. Our own reaction time test reports against this figure rather than a percentile, for exactly the reason above.

How it changes with age

In a UK study of over 7,000 adults aged 18–82, simple reaction time held roughly steady until about age 50 before slowing, while four-choice reaction time slowed steadily across the entire adult range.[3] That’s Donders’ distinction showing up in aging: the raw signal-to-muscle pathway is robust; it’s the decision stage that pays the age tax first. Standardized tools like the Deary-Liewald task exist precisely to measure both stages reliably.[4]

Your ears are faster than your eyes

Reaction to sound is consistently faster than reaction to sight — auditory processing reaches the motor system by a shorter route, a difference confirmed in controlled comparisons of the two modalities.[5] That’s the design insight behind Cardinal Pulse, our audio-first reaction game: each direction has its own drum voice, and the drum lands exactly on the strike moment. You’re training the fast channel, not just the familiar one.

Can you actually get faster?

Yes — within honest limits. Research on action gaming consistently finds that experienced players respond faster than non-players across many tasks with no loss of accuracy,[6] and a meta-analysis covering fifteen years of studies found that game-based training interventions causally improve perceptual and attentional performance.[7] The speed–accuracy tradeoff itself is trainable: learning to be fast without becoming sloppy is precisely the skill. That’s what Quantum Grid scores — centered hits beat panic clicks, and decoys punish spraying. For the broader question of what training does and doesn’t transfer to, see our evidence summary.

References

  1. [1]Donders, F. C. (1969; original work 1868). On the speed of mental processes. Acta Psychologica, 30, 412–431. https://doi.org/10.1016/0001-6918(69)90065-1
  2. [2]Woods, D. L., Wyma, J. M., Yund, E. W., Herron, T. J., & Reed, B. (2015). Factors influencing the latency of simple reaction time. Frontiers in Human Neuroscience, 9, 131. https://doi.org/10.3389/fnhum.2015.00131
  3. [3]Der, G., & Deary, I. J. (2006). Age and sex differences in reaction time in adulthood: Results from the United Kingdom Health and Lifestyle Survey. Psychology and Aging, 21(1), 62–73. https://doi.org/10.1037/0882-7974.21.1.62
  4. [4]Deary, I. J., Liewald, D., & Nissan, J. (2011). A free, easy-to-use, computer-based simple and four-choice reaction time programme: The Deary-Liewald reaction time task. Behavior Research Methods, 43(1), 258–268. https://doi.org/10.3758/s13428-010-0024-1
  5. [5]Jain, A., Bansal, R., Kumar, A., & Singh, K. D. (2015). A comparative study of visual and auditory reaction times on the basis of gender and physical activity levels of medical first year students. International Journal of Applied and Basic Medical Research, 5(2), 124–127. https://doi.org/10.4103/2229-516X.157168
  6. [6]Dye, M. W. G., Green, C. S., & Bavelier, D. (2009). Increasing Speed of Processing With Action Video Games. Current Directions in Psychological Science, 18(6), 321–326. https://doi.org/10.1111/j.1467-8721.2009.01660.x
  7. [7]Bediou, B., et al. (2018). Meta-analysis of action video game impact on perceptual, attentional, and cognitive skills. Psychological Bulletin, 144(1), 77–110. https://doi.org/10.1037/bul0000130

Put it into practice

Every claim above is about trained skills — here’s where you train them.

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