Test yourself

A quick reflex test. Press when you see a circle. Hold back when you see a square. It sounds easy — most people are surprised how often they aren't.

Ready when you are

Press GO (or hit the spacebar) only when a circle appears. If you see a square, do nothing.

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This is a rough, first version of the test — same core idea used in real attention and impulse-control research, simplified for the web.