Cognitive games · response inhibition
Stop when you see the X.
An arrow appears. Press the direction it points (left or right). Sometimes — about 25% of the time — an X flashes after the arrow. When it does, don't press anything. 20 trials. Brown-noise base. Calligraphic strokes. No game over.
Press Start. Then watch the center.
Press ← for left, → for right. On mobile: use the buttons below.
Round complete.
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How it works. Standard stop-signal task — used in cognitive labs to measure response inhibition. About 25% of trials are "stop" trials where you should not press. The score isn't a leaderboard. The number that's clinically interesting is your stop-signal reaction time (SSRT) — how late after the arrow can the stop signal arrive before you can't inhibit anymore. Lower SSRT = better inhibition. Most ADHD adults have higher SSRTs than neurotypical peers; the gap is what stimulant medication often reduces.