Extends prior theory and research by postulating the existence of an intermediate class of concepts called 'hypothetical'. Investigates the hypothesis that three kinds of scientific concepts exist by constructing and administering a test on concepts introduced in a college biology course. Supports the hypothesis that intellectual development…

Assessed Kolb learning styles and neo-Piagetian development levels of students who then completed a lecture/lab course with either inquiry or expository instructional methods. The predicted interaction between Kolb's thinking/feeling learning dimension and instructional method was not found, while thinking/feeling dimension and developmental level…

Finds that various aspects of formal reasoning correlated significantly with mean t-unit lengths written by high school freshman boys, but not by freshman girls. Suggests that the reasoning tasks may have been biased against females. (RL)

Discusses whether formal thought constitutes a structured whole and role of propositional logic in advanced reasoning. Presents aspects of advanced reasoning model, considering hypothesis generation/testing as central processes in intellectual development. Argues that advanced reasoning schemata are linked by these processes and should be…

Assessed the effect of a one-semester college biology course on the development of students (N=72) ability to reason formally and interactions among intelligence, cognitive style, and cognitive level. Includes implications for science instruction. (SK)