What reaction time is made of
Between a signal and your movement there is a chain of events: your senses register the stimulus, the signal reaches the brain, the brain recognises it, chooses a response and sends a command to the muscles, and the muscles contract. Training barely speeds up nerve conduction, but it does speed up the “smart” stages — recognition, choice and movement preparation.
That is why it helps to tell the types apart:
- Simple reaction — one signal, one response. Example: the reaction time test, where you tap when the colour changes.
- Choice reaction — several signals and several responses. The more options, the longer the decision (Hick’s law). Examples: Rock-Paper-Scissors, Reverse.
- Reaction with inhibition — sometimes you must not respond at all. Example: Formula F1, where you can’t move before the red light.
What a normal reaction time is
| Signal type | Adult benchmark |
|---|---|
| Simple reaction to light (lab) | around 200–250 ms |
| Simple reaction to sound | on average a few dozen ms faster than light |
| Online test on a phone or computer | usually 250–300 ms because of device latency |
| Choice reaction (2–4 options) | noticeably slower than simple, often 300–500 ms |
| A driver reacting to a hazard in real traffic | usually around a second or more: notice, assess, move the foot |
Numbers depend on the method, so compare yourself with yourself. If you consistently score 280 ms on a phone, that is a normal result, not a cause for concern.
What hurts reaction time most
- Sleep loss. Lack of sleep sharply increases attention lapses — moments when your reaction suddenly stretches to several times its usual length. It is one reason fatigue causes car crashes.
- Alcohol. It slows reactions and impairs judgement before a person feels drunk.
- Distraction. Talking on the phone or texting while driving noticeably worsens reactions, even hands-free.
- Age. Speed peaks roughly between 20 and 30, then slows gradually while its variability grows. Physical and mental activity help you stay sharp for longer.
- Fatigue and monotony. After 20–30 minutes of a repetitive task, most people’s attention dips.
At 60 km/h (about 37 mph) a car travels around 17 metres per second. Every extra 100 ms of reaction time is almost 2 metres before you even start braking.
7 exercises to train your reaction time
1. The ruler drop test
A classic exercise that only needs a helper. They hold a ruler vertically with the zero mark between your thumb and index finger, then drop it without warning — you catch it. The distance it fell gives your time: t = √(2d / g).
| Ruler fell | Reaction time |
|---|---|
| 10 cm | ≈ 0.14 s |
| 15 cm | ≈ 0.17 s |
| 20 cm | ≈ 0.20 s |
| 25 cm | ≈ 0.23 s |
| 30 cm | ≈ 0.25 s |
2. Simple reactions to different cues
Alternate light, sound and vibration. In Cabe these are Color Reaction, Sound Reaction and Vibration Reaction. Different channels take different routes in the brain, and it is worth training all of them.
3. Choice reactions
Rock-Paper-Scissors, Peripheral Vision and Dodge make you work out the right response first. That is closer to real life, where there is rarely just one signal.
4. Inhibition
Formula F1 and Reverse teach you not to respond automatically. Good reactions are not only about speed but also about having no false starts.
5. Peripheral vision
Keep your eyes on the centre and react to what appears at the side. Useful for driving and team sports.
6. Ball sports
Table tennis, badminton, tennis, boxing, football — anything where you react to a moving object. It trains reactions in “live” conditions and improves overall fitness too.
7. Action games — in moderation
Research shows that players of fast-paced video games react faster on average without losing accuracy. But it is easy to overdo: short sessions beat all-night marathons that cost you sleep.
A 4-week programme
- Day 1. Take the reaction time test three times and note your average.
- Every day, 5–7 minutes: one simple-reaction game → one choice game → one inhibition game.
- 2–3 times a week: 20–30 minutes of ball sport or any activity.
- After 4 weeks: repeat the test in the same conditions — same device, same time of day.
The fastest progress usually comes in the first weeks. After that, gains slow down — that is normal; the key is not to quit.