Conditional reasoning: The necessary and sufficient conditions

Canadian Journal of Experimental Psychology/Revue Canadienne de Psychologie Expérimentale 49 (1):1-60 (1995)
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Abstract

Five experiments, with 163 university students, investigated 2 theories of conditional reasoning. The pragmatic schema theory posits that CDR is mediated by context-sensitive inference rules. According to the contextual cuing theory, inferences are based on a mental model that represents necessity and sufficiency relations. Both schematic relations and necessity relations predicted responses on a 4-card selection task. In contrast, after the effects of perceived necessity had been partialled out, schematic relations did not predict responses to either a conditional arguments task or a task in which Ss judged the similarity of "if then" and "only if" statements. Findings question the assumption that reasoning is mediated by schematic rules, which presumably apply regardless of task. A reconceptualization of the pragmatic reasoning schema is proposed

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