Start with what cannot change
Simple reaction time — one signal, one response — is close to a fixed property of your nervous system. Signal transmission, processing and muscle activation have physical limits, and practice moves them by a few percent at best. Anyone promising to take you from 280 ms to 180 ms with a training app is selling the improvement you would get from warming up and paying attention.
That is not a reason to give up. It is a reason to spend your effort on the parts that do move, which happen to be the parts that decide outcomes in real activities.
The four things that actually move the number
- Sleep. The largest single-day effect available to you. One short night degrades both speed and consistency, and the consistency damage is worse.
- Warming up. Your first run of the day is reliably 10 to 20 ms slower than your third. If you care about performance in the first minutes of an activity, warm up before it rather than during it.
- Task-specific practice. Decision time shrinks as a signal-to-response mapping becomes familiar. This is real, large and entirely specific to the task you practised.
- Aerobic fitness. Associated with better reaction performance across age groups, and it is the only intervention here that also improves everything else about you.
Anticipation is the real skill
Watch a professional goalkeeper and it looks like superhuman reaction. Measure them on a lab test and their simple reaction time is close to ordinary. The difference is that they started moving before the ball was struck, because the striker's hips told them where it was going.
Anticipation is pattern recognition built from thousands of repetitions in one domain, and it does not transfer. A gamer with brilliant anticipation in one shooter is ordinary in another for the first few weeks. If you want to react faster at something specific, the fastest route is more repetitions of that specific thing — not generic reaction drills.
Every millisecond you save by knowing what is coming is worth ten you tried to shave off your nervous system.
Fix the equipment before the human
A cheap wireless mouse, a 60 Hz display, a laggy TV in game mode off, or Bluetooth headphones can each add more delay than your entire training programme will ever remove. Wired peripherals, a higher refresh rate and a display in its low-latency mode are a one-off purchase that buys real milliseconds.
Use the display correction on your result to see how much of your score belongs to your screen. If the corrected figure is much better than the raw one, your hardware is the cheapest upgrade available.
A simple weekly routine
- Test once at the start of the week, rested, five trials, same device. That is your baseline.
- Do your task-specific practice in short focused blocks of ten to fifteen minutes, not marathon sessions.
- Test again at the end of the week under the same conditions — same device, same time of day, after a warm-up.
- Compare averages, not best trials, and treat anything under 15 ms as noise.
- Track the spread. Falling variability is a better sign of progress than a falling average.
What to ignore
Reaction-time supplements, strobe glasses sold as vision training, and generic brain-training apps all have marketing well ahead of their evidence. Caffeine works, modestly, and you already know about caffeine. Sleep works, substantially, and it is free.