The Stroop effect (for J. Ridley Stroop, 1935) is interference when trying to name the color of a stimulus that is itself an incongruous color word (e.g., RED in blue letters) compared to when the stimulus is a congruous color word or a neutral word (BLUE or ROD in blue). This competition from strong S-R associations has been extended to other Stroop-like effects (e.g., number, size).

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