A short sequence appears. Colors alternate, shapes rotate, sizes grow, counts climb. Below, four candidate items. Pick the one that continues the rule. This is fluid intelligence — the ability to spot novel patterns without prior knowledge.
The Science: Modeled on Raven’s Progressive Matrices (Raven, 1938) — the most studied non-verbal reasoning test in cognitive psychology. Meta-analyses show fluid intelligence is trainable, with durable gains from adaptive practice.
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