The potency of Pascual-Leone's M construct was demonstrated by experimental production of decalages on combinatorial reasoning tasks. Logical and perceptual task characteristics remained constant while the number of variables was varied so that processing demands, relative to processing capacities, were the same for subjects at each of three age…

Two experiments compared the cognitive maps (mental representations of the spatial environment) of first graders, fifth graders and college students, and investigated developmental changes in the ability to manipulate cognitive maps mentally. In the first experiment, subjects were asked to move from stationpoint to stationpoint and at each, to…

This study had two purposes: (1) to determine when children distinguish ambiguous from precise messages and when they can resolve ambiguity through additional questioning, and (2) to identify whether implicit messages were more difficult to identify than explicit ones. All children found ambiguous messages significantly more difficult to…

The Goldstein-Scheerer Tests of Abstract and Concrete Thinking are reviewed. This evaluative summary supplements several reviews in the Mental Measurements Yearbook series. The Goldstein-Scheerer tests are used by clinicians and researchers to distinguish normal individuals (those able to engage in two qualitatively different levels of cognitive…