The spatial-numerical association of response codes (SNARC) effect occurs when magnitude information is associated with a particular spatial organization. This association then effects subsequent tasks (response times, looking behavior, etc.). For example, people respond faster (e.g., a key press) to smaller numbers when they are presented on the left (or with the left hand) and to larger numbers when they are presented on the right (or with the right hand), due to the correspondence between the magnitude of a number on a mental number line. The direction of the SNARC effect depends on the orientation of the mental number line (e.g., horizontally left-to-right in English; vertically top-to-bottom in Japanese).

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