In the course of two experiments, groups of kindergarten, second, fourth, sixth grade and college students received several discrimination problems to investigate hypothesis testing behavior. (Authors/MB)

A task was used in which subjects at three different Piagetian stages of intellectual development were to induce the missing relationship in different triadic situations. (Authors)

Results showed that reversal shift was easier than extradimensional shift and that relative shift difficulty was unaffected by instructions, in contrast to findings with college-age subjects. (Authors)

Children's performance on multidimensional classification tasks was examined in two experiments. In Experiment 1, preschool, first-, and third-grade children were shown a standard stimulus and were then asked to judge whether several comparison stimuli were the same as or different from the standard. Comparison stimuli differed from the standard…

It was concluded that previous explanations of visual exploration or stimulus preference have been oversimplified, and studies on the whole have failed to take into account a crucial interaction between sex and age variables. (Authors)