What is measured in this reaction test?

It measures time in milliseconds between color change and click.

Can I use touch input?

Yes, taps and clicks both work.

Test brain speed by reacting quickly to a color change.

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Press start to begin.

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Result is shown in milliseconds. Lower numbers indicate faster visual-motor reaction time in this task.

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What is a good reaction time?

Many healthy adults fall around 200-300 ms.

Why did I get "too early"?

You clicked before the target turned green.