A rapid stream of shapes appears in the play area. Circles: tap them. Squares: don’t. About three-quarters of what you see are circles, so your finger builds a habit — which is exactly what makes the squares hard to resist.
The Science: The Go/No-Go paradigm (Donders, 1868; refined by Robertson and colleagues, 1997 into the Sustained Attention to Response Task). Failure rates on no-go trials predict impulsivity in ADHD studies and vigilance in clinical assessment.
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