Color discrimination

Color Reaction Test

We give you a target color. Then circles start flashing: sometimes your color, sometimes a decoy. Tap only when you see the right one. It adds a layer the plain test skips: you have to recognise the color before you act, not just spot any change.

Color Reaction

Tap only when you see the target color. Press to start.

Recognise, then react

Adding color changes the whole job. In the plain test, the second anything happens you can move, no thinking required. Here you have to answer a question first: is this the right color? That question takes time to answer, and the decoys are there to make you answer wrong. The result is a cleaner look at how fast you can actually process a signal, not just detect one.

It is a gentler cousin of the choice reaction test. There you pick between responses; here you pick whether to respond at all. Both show the same truth: the instant you add a decision, your reaction time stretches in a predictable way.

Getting a clean score

  • Lock the target in. Glance at the color name up top before you start and keep it in mind.
  • Resist the decoys. A wrong tap counts against you: better to pause a beat than fire at the wrong color.
  • Run it a few times with different target colors to see whether some are quicker for you than others.

Frequently asked questions

How is this different from a normal reaction test?
A standard reaction test fires when anything changes. You don't have to think about what changed. Here you must identify the color first and respond only to the right one, which adds a recognition and decision step. That makes it a discrimination reaction test, and your times will run a little slower because of the extra processing.
Why do the decoy colors slow me down?
Because your brain has to check every flash against the target before deciding to move. That check costs time, and a convincing decoy can briefly pull a response out of you before you catch it. It is a small taste of what Hick's law describes: more to discriminate means more time. See choice reaction time.
What is a good color reaction time?
Expect it to land a bit above your simple reaction time (often in the 300–400 ms range) because of the recognition step. As always, consistency and low error counts matter more than one fast tap.

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