90 nursery school-aged children from 3 to 6 yr. Of age were given either a conceptual, a half-conceptual, or a nonconceptual sorting task. The youngest (3 yr.) children learned the three tasks almost at the same rate and the older (6 yr.) children learned the conceptual task faster and half-conceptual task slower than nonconceptual task, which showed no significant age difference. These were interpreted to show that the rate of learning instance-response associations remains constant from 3 to 6 yr. of age, whereas children's ability to use concepts in learning the sorting tasks increases through these ages.
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