A short rule defines which coloured shapes belong, for example a red triangle or a blue square. A rapid stream of single symbols then appears and you accept or reject each one against the rule, scoring as many correct calls as you can in the time limit. Each session generates a new rule, so the exercise trains flexible rule-following under time pressure rather than a memorised reflex.
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Rule classification measures rule-based selective attention and processing speed: holding a defined colour-and-shape criterion in working memory and applying it rapidly and consistently to a continuous stream. It maps onto filtering relevant calls and alerts against a known set of conditions.
Do not re-read the full rule on every symbol. Convert it once into a fast internal check, for example 'red and pointy, or blue and square, otherwise no'. Applying a compact internal phrase is much quicker than scanning the rule text under time pressure. If the rule has two clauses, check the more common one first.
The Accept and Reject targets are large and sit side by side at the bottom, so you can run the whole task with one thumb, the way these speeded classification tests are usually taken on a tablet. Keyboard still works (f or right arrow to accept, j or left arrow to reject) if you prefer.
Because errors subtract, net correct rewards disciplined accuracy, not frantic clicking. A strong session keeps errors under about 10 percent at a steady pace. In Endurance mode expect a dip right after the rule changes: that recovery, dropping the old rule fast, is exactly what the mode trains, so watch the before-and-after split on your results.
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