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Evidence is presented for the immediate apprehension of exact small quantities. Participants performed a quantification task (are the number of items greater or smaller than?), and carry-over effects were examined between numbers requiring the same response. Carry-over effects between small numbers were strongly affected by repeats of pattern and number identity relative to when displays were from the same response category but contained different numbers. Carry-over effects with large items were less sensitive to both pattern and number identity, even when the numbers in the small and large categories were matched for discriminability. The data suggest that small numbers are immediately apprehended through a direct subitization process distinct from pattern recognition and the apprehension of approximate number.

Original publication

DOI

10.1037/a0025390

Type

Journal article

Journal

J Exp Psychol Hum Percept Perform

Publication Date

02/2012

Volume

38

Pages

18 - 22

Keywords

Discrimination (Psychology), Humans, Mathematical Concepts, Pattern Recognition, Visual, Perception, Psychological Tests