Abstract
To determine whether the vertical dimension is used differently in size judgments by children of different ages, 5 groups of Ss were tested; their mean ages ranged from 7 yr. in a first grade group to 11 yr. in a fifth grade group. Stimuli were 6 pairs of 3-dimensional objects. The influence of the vertical dimension in children's judgments of size was critically related to age, decreasing in importance with increasing age.

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