On-line evidence for elaborative logical inferences in text.

Abstract

A model of propositional-logic reasoning proposed by M. D. S. Braine, B. J. Reiser, and B. Rumain (1984) claims that inferences such as "p or q; not p/therefore q" are made spontaneously by readers at the moment both premises are available. This claim is inconsistent with some evidence in the text-processing literature that suggests that only those inferences necessary for textual coherence are made spontaneously. In the present study, participants read stories in which a logical inference was not necessary to maintain textual coherence, and inference making was assessed with on-line probes. Two experiments tested logical forms central to Braine et al.'s model, and both indicated that participants were making the logical inferences. Two further experiments replicated this result with stories that did not begin with thematic titles. These findings support Braine et al.'s prediction that some propositional-logic inferences are made routinely in texts that do not require them for coherence.

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