Cognitive5 rounds · ~2 minutes

Reaction Time Test

Reaction time is the interval between a stimulus and your response. It reflects the speed of your nervous system and is influenced by age, fatigue, caffeine, and practice. The average human reaction time to a visual stimulus is 250ms.

What is this test?

This test measures how quickly you respond to a visual stimulus — the time between seeing a signal and clicking. It's a direct measure of your nervous system's processing speed.

Why take it?

Reaction time affects driving safety, sports performance, and everyday tasks. Knowing your baseline helps you track improvements or spot signs of fatigue.

How does it work?

Click 'Start Test', then wait for the screen to turn green. Click as fast as you can when it does. Complete 5 rounds for an accurate average.

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Click to start

What affects reaction time?

  • Age — Reaction time peaks in your 20s and gradually slows after 30.
  • Fatigue — Sleep deprivation can slow reaction time by up to 50ms.
  • Caffeine — Moderate caffeine intake can improve reaction time by ~10ms.
  • Practice — Regular training can shave 20–40ms off your baseline.

What Is Reaction Time?

Reaction time is the interval between the presentation of a stimulus and the initiation of a response. In this test, it measures the time between the screen turning green and your click. It is a direct measure of how quickly your nervous system processes information and triggers a motor response.

What Is a Normal Reaction Time?

The average human reaction time to a visual stimulus is approximately 250 milliseconds (ms). Elite athletes and professional gamers often achieve reaction times below 200ms. Reaction time naturally slows with age, beginning around age 30, and can be significantly impaired by fatigue, alcohol, and distraction.

How to Improve Your Reaction Time

Reaction time can be improved through regular practice, adequate sleep, proper hydration, and physical exercise. Studies show that aerobic exercise can improve reaction time by up to 20ms. Caffeine in moderate doses (100-200mg) can also provide a temporary boost of around 10ms.

Factors That Affect Reaction Time

Multiple factors influence reaction time including age (peaks in mid-20s), sleep deprivation (can add 50-100ms), alcohol consumption, stress levels, and the type of stimulus. Visual reaction time is typically slower than auditory reaction time by about 20-40ms.

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Frequently Asked Questions

What is a good reaction time?

The average human reaction time to a visual stimulus is 250ms. Under 200ms is excellent, under 150ms is exceptional (typical of elite gamers and athletes).

What affects reaction time?

Age, fatigue, caffeine, practice, and distractions all affect reaction time. Reaction time peaks in your mid-20s and gradually slows with age.

How accurate is this test?

This test measures your reaction to a visual stimulus on screen. It's a good indicator of your reflexes, but monitor refresh rate and input lag can add 10–30ms of variance.

Why did I get a very fast time?

If you click before the screen turns green, that's an anticipation click — not a true reaction. The test will reset if you click too early.

How can I improve my reaction time?

Regular practice, adequate sleep, staying hydrated, and reducing stress can all help. Reaction time training games and sports can also improve your baseline over time.