Animism (erroneously believing inanimate objects are alive) is present in older adults (McDonald & Stuart-Hamilton, 2000). However, it is unclear if animism arises in later life or middle age. The current study tested 34 middle-aged adults (mean age 48 years) on Piaget's animism task and found a significant level of animism. Strength of…

Two studies investigated the functional equivalence of three different scoring systems used to assess the child's ability to understand and carry out multiplicative classification tasks. All three scoring criteria produced reliable and homogeneous tests. Their factor matrices were similar, and the corresponding factor structures were invariant…

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…

Two studies demonstrated dissociation between preschoolers' understanding of pictorial and mental representations. Results showed that false picture tasks were significantly easier than false belief tasks. There was no correlation between performance on the two. Children were trained on false belief, false picture, or number conservation tasks;…

This study explored the extent of measurable differences in performance on Piagetian tasks among six year olds who are exposed to one or two languages. Subjects (N=120) were divided into four groups: (1) native English-speaking Anglo-Americans who live in the United States; (2) native Japanese-speaking Japanese who live in Japan; (3) native…

A study examined the strategies and processes used by a sample of 33 Argentinean adults with little school experience to solve problems and acquire knowledge at work. A Piagetian methodological approach was used to observe adults in building, rural, and domestic work settings and to analyze empirical data regarding their behavior in task-oriented…