Piagetian tasks have more to do with the child's ability to inhibit interference than they do with the ability to grasp their underlying logic. Here we used a chronometric paradigm with 11-year-olds, who succeed in Piaget's conservation-of-weight task, to test the role of cognitive inhibition in a priming version of this classical task. The…

Attachment representations and self-confidence were assessed at age 7 on the basis of children's responses to a separation story and independent observations, although cognitive functioning was measured at ages 7-17 years based on a battery of Piagetian tasks assessing concrete and formal reasoning. Children with a secure attachment representation…

The relationship of concrete operations to beginning reading was investigated with three samples of early readers and prereaders: prekindergarten and kindergarten children who were early readers and those who were not yet reading. Piagetian tasks on conservation of number, conservation of quantity, seriation, multiple classification, and class…

A 1-year lag was found between the effect of an intervention intended to promote formal operational thinking in students initially 11 or 12 years of age and the appearance of substantial science achievement in the experimental groups. A one-year lag on cognitive development and an age/gender interaction were also reported. (Author/KR)