title: Reasoning strategies for suppositional deductions.
abstract: Deductive reasoning shares with other forms of thinking a reliance on strategies, as shown by the results of three experiments on the nature and development of control strategies to solve suppositional deductions. These puzzles are based on assertors who may or may not be telling the truth, and their assertions about their status as truthtellers and liars. The first experiment shows that reasoners make backward inferences as well as forward inferences, to short-cut their way through the alternatives, and the generation of suppositions is a source of difficulty. The second experiment establishes that the elimination of the suppositional status of an individual does not render problems easier. The third experiment shows that reasoners can improve their reasoning accuracy and speed spontaneously, without feedback, and it clarifies the transfer of strategies and their development. We discuss the implications of these data for alternative theories of suppositional deduction and for the relationship between reasoning and other forms of thinking such as problem solving.
authors.affiliation: Department of Psychology, University of Dublin, Trinity College, Ireland. rmbyrne@tcd.ie
authors.forename: R M
authors.initials: RM
authors.lastname: Byrne
authors.forename: S J
authors.initials: SJ
authors.lastname: Handley
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D003657:Decision Making; D003662:Decision Theory; D005260:Female; D006801:Humans; D008128:Logic; D008297:Male; D008875:Middle Aged; D011340:Problem Solving; D011581:Psychological Tests; D013850:Thinking