How to Improve Your Reaction Time (and How to Measure It Fairly)
What limits human reaction time, what practice can and cannot change, and why your screen and mouse matter more than you expect.
Reaction time feels like a raw trait, but a lot of what you see in a reaction-time test has little to do with your nervous system. Before trying to get faster, it helps to know what is slowing you down and which parts you can influence. This article separates the biology from the equipment and from the habits you can change.
What reaction time is made of
A simple reaction, such as clicking when a box changes colour, involves four stages:
- Sensing: light hits the retina, and the signal travels to the visual cortex.
- Deciding: the brain registers that the expected signal has arrived and triggers the response. In a simple task this is quick; in a choice task it takes longer, a pattern described by Hick's law.
- Sending the command: motor areas of the brain send a signal down the spinal cord to the muscle.
- Moving: the muscle contracts and the finger presses the button.
Each stage takes time that has a floor set by biology. Responses to sound and touch are typically a little quicker than to sight, because the sensory pathway is shorter. Athletics rules treat any sprint reaction faster than 100 ms after the gun as a false start, because it is considered too fast to be a response to the sound at all. Our reaction time test removes valid-looking responses under 120 ms for the same reason.
The biggest factor may be your equipment
In a browser test, the number you see includes delays that are not yours:
- The screen. A 60 Hz monitor updates every 16.7 ms, and the display itself may add its own processing delay. A 144 Hz gaming monitor shows changes sooner.
- The input device. Wired mice generally report clicks faster than wireless ones or touchscreens, and touchscreens add further latency.
- The browser and system. A busy computer can delay the moment the page registers your click.
The practical lesson: if your result seems slow, try again on a different device before assuming anything about yourself. And when you compare results over time, always use the same setup.
What you can actually change
Be rested
Sleep loss is one of the most reliable ways to slow responses. It mainly causes lapses, occasional very slow responses, rather than a uniform slowing. In controlled studies using the psychomotor vigilance task, people restricted to six hours a night for two weeks performed similarly to people kept awake for one to two nights, while rating themselves as only slightly sleepy (Van Dongen et al., 2003). We discuss this in more detail in our article on sleep and cognitive performance.
Be alert, but not tense
Moderate arousal helps and too much hurts. Caffeine can modestly improve alertness and speed in tired people. A very anxious state tends to produce more premature clicks and more variable results.
Practise the specific task
Practice improves performance on the task you practise, partly by teaching you to prepare the movement and to attend to the right spot. In sport and esports, trained players respond faster in their own domain because they anticipate better, not because their nerves conduct faster. That improvement is mostly specific: it does not reliably carry over to unrelated tasks, as we explain in does brain training work?.
Optimise your posture and set-up
- Rest a finger on the button so the movement is short.
- Keep your eyes on the target area, not the cursor.
- Reduce distractions and close heavy apps.
Stay active
Regular physical activity is associated with better processing speed in older adults. For young adults, the benefit on simple reaction time is small. A short bout of exercise can raise alertness, but it is not a lasting change to nerve conduction.
The speed-accuracy trade-off
You can always be faster by guessing. In a test with a random delay, an early click is penalised; in real life an early reaction can be wrong. Researchers describe this as the speed-accuracy trade-off: the faster you push, the more errors you make. A better target than "as fast as possible" is "as fast as possible without anticipating". If your fastest clicks are under 150 ms, you are more likely predicting than reacting.
What age does
Simple reaction time slows gradually across adult life, and choice reaction time slows more. You cannot change your age, but it is useful context for comparing yourself. See average reaction time by age for figures.
A simple routine
- Pick one device and use it every time.
- Take the reaction time test when rested, with no distractions.
- Run it two or three times and compare medians, not your single fastest click.
- If you want to see the effect of a change, such as a night of poor sleep, change only that.
Sources
- 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.
- Van Dongen, H. P. A., Maislin, G., Mullington, J. M., & Dinges, D. F. (2003). The cumulative cost of additional wakefulness. Sleep, 26(2), 117–126.
- Hick, W. E. (1952). On the rate of gain of information. Quarterly Journal of Experimental Psychology, 4(1), 11–26.
- Deary, I. J., Der, G., & Ford, G. (2001). Reaction times and intelligence differences: A population-based cohort study. Intelligence, 29(5), 389–399.