The classic odd-one-out task at speed. Nine shapes fill a 3×3 grid. Eight share a color or shape. One is different. Tap it before the next grid loads.
The Science: Rooted in Feature Integration Theory (Treisman & Gelade, 1980). Simple feature searches — a red dot among blue ones — happen pre-attentively in under 200 ms; conjunction searches take substantially longer.
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