Knowing the temporal direction of causal relations is critical for producing desired outcomes and explaining events. Existing evidence suggests that children start to grasp that causes must precede their effects (the temporal priority principle) by age 3; however, whether younger children also understand this has, to our knowledge, not previously…

Conceptual change requires learners to restructure parts of their conceptual knowledge base. Prior research has identified the fragmentation and the integration of knowledge as 2 important component processes of knowledge restructuring but remains unclear as to their relative importance and the time of their occurrence during development. Previous…

Five studies investigated preschoolers' understanding of the biological germ theory of illness compared to that of 6- or 10- to 11-year-olds. Found that the younger the child, the less likely he or she was to judge germs as causes of illness. Studies undermined claim that preschoolers understand germs to be uniquely biological causal agents. (JPB)

Examines reasons for sex-related differences among adults on horizontality and verticality concepts. Studies the effects on task performance of inadequate knowlege of relevant physical phenomena and pictorial examples. (Author/AS)

Findings lend support for further development of the Manikin Construction Task for the purpose of measuring specific conceptual knowledge at all ages. There is also support for its development as an intellectual screening instrument at the 3-year level. (Author)

Demonstrates the usefulness of the inclusion paradigm as a methodological tool in providing information about the conceptual breadth of selected social and nonsocial superordinate categories in children who exhibit some degree of inclusion logic. (HOD)