Three key predictions of Piaget's groupement model of middle childhood cognition were examined in the speed and time concept areas with a total of 93 children in grades 1, 2, and 3. (ED)

This study examined developmental changes in skill and speed of detection of variation in matrix patterns for 93 kindergartners, 30 fifth-grade students, 30 high school sophomores, 32 nonartists and 30 professional artists. (Author/JMB)

To investigate the development of function concepts and their relation to mathematical and logical abilities typically acquired during the age period of five to seven years, children were tested on nonnumerical function tasks, numerical tasks, and aspects of logical reasoning. (PCB)

On tasks involving assessement of the heights of colored sticks, kindergarten, third-grade, and adult subjects were successful on inferences involving only equalities or only inequalities across various conditions and procedures. A dramatic developmental increase in performance was found on inferences based on the combination of equality and…

Two studies of adolescents in England and Russia examined the effects of prolonged instruction on students' development of abstract deductive reasoning and understanding of logical necessity in algebraic and verbal reasoning. Results indicated that prolonged instruction emphasizing the metalevel of algebraic deduction contributed to enhanced…

Two experiments tested claim that transparency of Korean fraction names promotes fraction concepts. Findings indicated that U.S. and Korean first- and second-graders erred similarly on a fraction-identification task, by treating fractions as whole numbers. Korean children performed at chance when whole-number representation was included but…