We present a theory suggesting that the ability to build category representations that reflect the nuances of category structures in the environment depends upon clustering mechanisms instantiated in an MTL-PFC-based circuit. Because function in this circuit declines with age, we predict that the ability to build category representations will be…

Prior research suggests that preschoolers can generalize object properties based on category information conveyed by semantically-similar labels. However, previous research did not control for co-occurrence probability of labels in natural speech. The current studies re-assessed children's generalization with semantically-similar labels.…

Investigates Inhelder and Piaget's claim that ages six to nine or ten represent a stage in children's learning of the concepts of all and some. (HM)

A sorting-recall procedure was used to examine the relationship between study and recall organization in reflective and impulsive children at the first and fourth grade levels. Data regarding sorting latencies per trial and the number of trials required to achieve stable sorts were provided by two indirect measures of the deliberateness and ease…

Self-directed, or independent study activities were studied in adolescents, as well as their antecedents and consequences. The interrelationships, across age and grade, of several variables were described; i.e.: course requirements and conditions, student characteristics, study activities, and school achievement. First, autonomous learning…