To investigate whether adolescents approve of disobedience or lying in response to rules that restrict behavior based on gender, 89 younger (M[subscript age] = 11.74) and older (M[subscript age] = 16.67) adolescents and emerging adults (M[subscript age] = 19.97) judged vignettes wherein a child prefers an activity, but the child's parents indicate…

Adults attach special value to objects that link to notable people or events--authentic objects. We examined children's monetary evaluation of authentic objects, focusing on four kinds: celebrity possessions (e.g., Harry Potter's glasses), original creations (e.g., the very first teddy bear), personal possessions (e.g., your…

This study examined if solving arithmetic problems hinders undergraduates' accuracy on algebra problems. The hypothesis was that solving arithmetic problems would hinder accuracy because it activates an operational view of equations, even in educated adults who have years of experience with algebra. In three experiments, undergraduates (N = 184)…

This study investigated how understanding of the equal sign changes as a function of experience in mathematics and variations in context. Students with different levels of mathematics experience (elementary school, seventh grade, undergraduate, and graduate) were randomly assigned to view the equal sign in one of three contexts: (a) equal sign…

Extending research on age norms in adults, the development of the knowledge of two components of the cultural concept of biography, biographical salience of and age norms for life events was studied from late childhood to early adulthood in Study 1 and across adulthood in Study 2. The largest increase in knowledge was found between ages 8 and 12,…