Two studies examined how nonconservers use the dimensions relevant to quantity in the conservation of substance task. Most nonconservers are very selective in their use of the information provided by these dimensions. Most preschool and kindergarten nonconservers used length to define amount, while ignoring width. This was true regardless of how…

Study explores the preschool child's ability to operate on a cognitive level by testing his capacity to compare a concrete stimulus with some abstract concept. (Author/CB)

The most significant finding is that classification according to complete similarity not only occurs much earlier than reported by Inhelder and Piaget, but also does not follow the developmental course reported by Inhelder and Piaget. (Author)

This study investigates the developmental changes that occur in the attending behavior of children engaged in a relatively simple classification task, and attempts to reaffirm the existence of developmental changes in stimulus preferences and in the ability to employ double classification systems. Subjects were 24 preschool and 24 first grade…

The influence of the ability to conserve length in the development of a size concept was investigated in males and females aged 4 years through 9 years. (GO)

Findings of this investigation suggest that a fruitful approach to the study of early cognitive development is to analyse variations in the selectivity involved in different kinds of actions by which children relate two objects. (Authors)