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Grouping strategies in number estimation extend the subitizing range

Maldonado Moscoso, Paula A. ; Castaldi, Elisa ; Burr, David C. ; Arrighi, Roberto ; Anobile, Giovanni


When asked to estimate the number of items in a visual array, educated adults and children are more precise and rapid if the items are clustered into small subgroups rather than randomly distributed. This phenomenon, termed "groupitizing", is thought to rely on the recruitment of the subitizing system (dedicated to the perception of very small numbers), with the aid of simple arithmetical ...


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