Abstract
This study examines the abstractness of children's mental representation of counting, and their understanding that the last number word used in a count tells how many items there are (the cardinal word principle). In the first experiment, twenty-four 2- and 3-year-olds counted objects, actions, and sounds. Children counted objects best, but most showed some ability to generalize their counting to actions and sounds, suggesting that at a very young age, children begin to develop an abstract, generalizable mental representation of the counting routine. However, when asked “how many” following counting, only older children (mean age 3:6) gave the last number word used in the count a majority of the time, suggesting that the younger children did not understand the cardinal word principle. In the second experiment (the “give-a-number” task), the same children were asked to give a puppet one, two, three, five and six items from a pile. The older children counted the items, showing a clear understanding of the cardinal word principle. The younger children succeeded only at giving one and sometimes two items, and never used counting to solve the task. A comparison of individual children's performance across the “how-many” and “give-a-number” tasks shows strong within-child consistency, indicating that children learn the cardinal word principle at roughly 3 1/2years of age. In the third experiment, 18 2- and 3-years-olds were asked several times for one, two, three, five, and six items, to determine the largest numerosity at which each child could succeed consistenly. Results indicate that children learn the meanings of smaller number words before larger ones within their counting range, up to the number three or four. They then learn the cardinal word principle at roughly 3 1/2 years of age, and perform a general induction over this knowledge to acquire the meanings of all the number words within their counting range.
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