Kahneman and Tversky's critique of Cohen's position on adults' probability reasoning is not valid. If they think Baconian logic is normatively unsound, the onus is on them to explain why. It is valid and useful because nature itself is full of causal processes. (Author/RD)

The ability of some individuals to understand self-embedded sentences, which occur when a sentence is placed within another sentence of a similar type by means of a relative clause, is shown to be related to their ability to reason with the use of the syllogistic form. (Author/KM)

A study investigating developmental differences in the ability to reason with conditional propositions used five variations of Wason's selection task to assess conditional reasoning in 132 eighth, tenth, and twelfth grade adolescents. In addition to examining developmental differences, the study had as an objective to examine the role of semantic…

Discusses problems in finding a place for logic in a model of reasoning and develops a conception of an overall model, one of whose components is strictly logical in nature. A new view of the logical function of "if-then" is proposed, then the logic is developed, and its relation to standard propositional logic is established. Also discusses…

Experiment to determine whether the use of realistic materials would improve performance in a deceptive reasoning problem. (Authors)

Three experiments examined the role of representations in adolescents' deductive reasoning. Findings indicated that, with age, conditional reasoning improved on tasks containing permission conditional relations; reasoning fallacies increased on tasks containing causal conditional relations. Valid conditional inferences were more common on problems…

The logical foundations of deduction and induction are outlined to form the rules for the construction of a set of tests of reasoning ability. Both deduction and induction involve the derivation of a conclusion from a set of premises. Deductive logic uses syllogisms and is abstract. Inductive logic is both empirical and abstract. Although…

Two experiments were performed to determine whether practice on less complex problems, either smaller size or in familiar context, produces a strategy that transfers to similar but more complex problems. Practice on familiar problems was no more effective than practice on unfamiliar for transfer to another unfamiliar context for all sizes. (Author)

This paper contains an elementary and short proof for the case that the underlying distribution function F is discrete, and then extends the result to the general F. In other proofs underlying iid sequences of random variables with continuous distributions are considered to be the "ideal" case. In this paper discretization of the underlying iid…

The goal of this unified theory of human reasoning is to specify what constitutes reasoning and to characterize the psychological distinction between inductive and deductive reasoning. The theory views reasoning as the controlled and mediated application of three processes (encoding, comparison and selective combination) to inferential rules. (JAZ)

Research supported by grants from the National Institute of Mental Health and the National Science Foundation. (DD)

A study examining readers' ability to infer consequences backward and forward from events described in stories is described. Results show that backward consequence inferences are more reliably drawn during the course of reading than forward consequence inferences. (MSE)

Reports survey results on proof conceptions. Presents an overview of responses at the end of year 8 (age 13 years) and year 9 (age 14 years). Distinguishes three strategies--empirical, focused-empirical, and focused-deductive--that represent shifts in attention from an inductive to a deductive approach. Indicates some progress from year 8 to year…

Deductive reasoning problems were presented to 72 public elementary school students, half of whom were identified as gifted (mean age of 9.6 years) and half of whom were regular education students (mean age of 9.3 years). They were used to test an hypothesis that gifted children who score significantly higher than average on standardized…