Abstract
Two experiments investigated numerosity discrimination in 7-month-old infants, comparing their performance on numbers within the range of subitizing (2 and 3 elements) with numbers marking the limit of this range, 4 elements, or lying outside this range (5 and 6 elements). The first experiment identified 3 as the upper limit of the small range of numbers by contrasting the discrimination tasks 3 vs. 4 with 4 vs. 5. The second one found, that infants can not only discriminate 2 from 4, discrepant from the finding of Xu (2003), but also 3 from 6 elements. It is discussed, that changing the continuous quantity of small numerosities will bias the infants towards element by element comparisons instead of comparing numerosities. Nevertheless, the study corroborates the finding from Xu (2003), that there are two systems of numerosity representation.
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