The authors describe a constructionist theory that accounts for the knowledge-based inferences that are constructed when readers comprehend narrative text. Readers potentially generate a rich variety of inferences when they construct a referential situation model of what the text is about. The proposed constructionist theory specifies that some, but not all, of this information is constructed under most conditions of comprehension. The distinctive assumptions of the constructionist theory embrace a principle of search (or effort) after meaning. According to this principle, readers attempt to construct a meaning representation that addresses the reader's goals, that is coherent at both local and global levels, and that explains why actions, events, and states are mentioned in the text. This study reviews empirical evidence that addresses this theory and contrasts it with alternative theoretical frameworks.

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The role of individual differences in bridging-inference processing was studied. Students (n = 135) read passages of short to moderate length. After each one, they answered corresponding questions about inferences that bridged causally related ideas that were either near or far apart in the text. The main hypothesis was that local bridging-inference processing is facilitated by the reader's predisposition to access pertinent knowledge during comprehension. Regression analyses provided support for this proposal and indicated that greater working-memory capacity and vocabulary knowledge promote inference processing. The following relationships between the predictors and inference processing were proposed: Knowledge access promotes the co-occurrence in working memory of the text ideas and knowledge needed to compute the bridge. Workingmemory capacity enhances the likelihood that needed antecedent ideas will be available to the bridging processes. Vocabulary knowledge may promote inference processing because unfamiliar word meanings place more demands on working-memory resources than do familiar meanings.