These results support Piaget's position that preoperational children respond to the perceptual lack of equality but not to the lack of conceptual equivalence in class-inclusion problems. (Authors)

This study examined the hypothesis that perceptual errors on a task requiring subjects to take different viewpoints could be explained in terms of response bias. Results were consistent with response bias hypothesis: making an egocentric error is different from behaving in an egocentric manner. (Author/SB)

One hundred and sixty first grade boys and girls of normal intelligence were tested for ability to conserve multiple space relations. The criterion task apparatus was a wooden T with a model of schoolhouse attached and centered above the point of contact of the horizontal and vertical axis. The T had a track running the length of both its axes…

Two techniques were used to modify an impulsive conceptual tempo on a visual discrimination task. The subjects were 42 first grade white children who had previously been classified as impulsive or near-impulsive on the Matching Familiar Figures Test given to 82 children. These subjects, who had scored above the median on errors and below the…

This manual in Italian provides a basic theory of reading and writing instruction for kindergarten and first grade teachers working in a bilingual setting. Reading and writing are seen as instruments of communication incorporating psychomotor, perceptual, conceptual, and logical skills. The manual covers the following areas: (1) the development of…