Reorientation tasks, in which disoriented participants attempt to relocate objects using different visual cues, have previously been understood to depend on representing aspects of the global organisation of the space, for example its major axis for judgements based on geometry. Careful analysis of the visual information available for these tasks…

Examined preschoolers' inductive inferences across biological and non-biological kinds. Found support for gradual-enrichment model of conceptual change. Four-year-olds had a limited, coherent, independent biological theory which may form the basis of mature understanding of biological kinds. Explored results in terms of multiple explanatory…

Conservation judgments are based on a combination of logical necessity and empirical belief. Results of two experiments support the view that the logical aspect of conservation is developmentally stable, while the empirical aspect varies widely across problems and individuals because of its dependence on relevant experience. (Author/RD)