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REFLEX · REACTION TIME

REACTION
TIME TEST

Wait for green, then click. Five rounds, best time wins - see where your reaction speed sits against published human norms.

← WHAT IS THIS?REACTION TIME · BEST OF 5 · AD-FREE ZONE
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THE LONG ANSWER ◢

A good reaction time is somewhere around 250 milliseconds. That is a quarter of a second, and it is roughly what a healthy young adult scores on the kind of test you just took: a colour changes, you click, we measure the gap.

The interesting part is what that quarter of a second is actually made of, because almost none of it is thinking.

Key Takeaways

  • Simple visual reaction time averages about 250 ms in healthy young adults, with most people landing between 190 and 300 ms.
  • The fastest verified times in controlled lab conditions sit around 100 to 120 ms. Anything much under that is a guess, not a reaction.
  • Reaction time peaks around age 24 and declines slowly after, with the drop accelerating past 50.
  • The age-related slowdown is mostly in motor output, not in the brain deciding. The signal arrives on time; the hand is late.

What are you actually measuring?

Four things, in a chain, and the whole chain has to finish before the click registers.

Four linked capsules in a row, standing for the chain from eye to brain to arm to mouse switch.

Light hits your retina and gets turned into a nerve signal. The signal travels to your visual cortex. Your brain recognises that something changed and decides to act. Then the motor command travels back down your arm and your finger physically moves the mouse button far enough to close a switch.

That last step is slower and heavier than people expect. It is a limb with mass, moving on a nerve signal that has to cross most of your body. When you feel like your reflexes have gone, this is usually the part that has changed.

What is a normal score?

Most healthy adults aged 18 to 24 land around 240 to 260 ms on a simple visual test. The broad healthy range is roughly 190 to 300 ms. Below about 150 ms you are in trained-athlete or professional-gamer territory, and professional first-person-shooter players do genuinely reach 150 to 180 ms with thousands of hours of practice behind them.

The floor is around 100 to 120 ms in controlled laboratory conditions. That is not a soft limit you can train past; it is roughly how long the biology takes.

Which gives you a useful rule for reading your own result. If you score under about 100 ms, you did not react. You guessed. You anticipated the change and started moving before it happened, and you got lucky with the timing. Our test throws those out rather than flattering you with them.

Why does reaction time get slower with age?

It gets slower, but not for the reason most people assume.

Reaction time peaks around age 24 and then declines gradually, with the decline accelerating past 50. Adults over 60 commonly sit closer to 330 to 380 ms. The most-cited evidence here is Der and Deary's large study of 7,130 participants, published in Psychology and Aging in 2006, which is big enough to show the shape of the curve properly rather than just a snapshot of one age group.

Here is the part worth knowing. When researchers separate the stages of that chain, the slowdown shows up mainly in motor output rather than in perception or decision. Comparisons with Victorian-era measurements point the same way: processing speed in modern populations looks about the same, and the age effect is largely the movement, not the thinking.

So the number on screen is not a readout of how sharp you are. It is substantially a readout of how quickly your hand does what it was already told to do.

A traffic light with the lower lamp lit, standing for the go signal a reaction test waits on.

What actually changes your score?

More than you would like, which is why one run tells you very little.

Your hardware. A wireless mouse, a high-latency monitor and a browser that is busy doing something else can add tens of milliseconds before your biology gets a look in. A test in a browser measures you and your equipment, and it cannot tell the two apart.

Time of day and tiredness. Simple reaction time varies measurably across the day, and fatigue is one of the largest single effects on it.

Whether you are expecting it. Anticipation is the big one. A predictable delay lets you pre-load the movement, which is why a good test randomises the wait.

Practice. Real but limited. You can shave off some of the motor lag with repetition. You cannot train your way past the biological floor.

Take five goes and use the middle of them. One result is noise.

Frequently Asked Questions

What is the average human reaction time?

About 250 ms for a simple visual reaction in healthy young adults, with most people between 190 and 300 ms. Times rise with age: many adults over 60 sit nearer 330 to 380 ms. Reaction to sound is typically a little faster than to light.

What is a fast reaction time?

Under about 200 ms is quick. Professional first-person-shooter players reach 150 to 180 ms, roughly a third faster than average, after thousands of hours of play. The fastest verified laboratory times are around 100 to 120 ms, which is close to the biological limit.

Is a reaction time under 100 ms possible?

Not as a genuine reaction. Verified lab results bottom out around 100 to 120 ms, so a sub-100 ms score on a browser test almost always means you anticipated the signal and moved early. It is a guess that happened to land, which is why our test discards it rather than counting it.

Does reaction time really get worse with age?

Yes, gradually, peaking around 24 and dropping off faster after 50. But the slowdown is mostly in motor output rather than in perception or decision-making, so it reflects how fast your hand executes an instruction more than how fast you worked out what to do.

Why is my score different every time?

Because a single measurement is mostly noise. Tiredness, time of day, whether you anticipated the change, your mouse, your monitor's latency and what your browser is doing all shift the number. Take several runs and read the middle one rather than your best.

Sources