Click the button with the same color as the one shown in the center.
Why it matters
A simple reaction (click when something changes) only measures perceptual speed. In real sport you almost always have to choose the correct response from several options — and that decision takes longer. This test isolates the time you need to make the right choice.
The speed of deciding between several possible responses — unlike simple reaction, you first have to identify the cue and pick the correct answer.
Athletes in situations with multiple possible responses (which way to dodge), and anyone wanting to train decision speed.
Rating scale
The relationship between the number of options and reaction time is described by Hick's law (Hick, 1952) — decision time grows with the logarithm of the number of choices. Choice reaction is therefore always slower than a simple reaction to a single cue, even though it measures a related skill.