A theory of analogical mapping between source and target analogs based upon interacting structural, semantic, and pragmatic constraints is proposed here. The structural constraint of isomorphism encourages mappings that maximize the consistency of relational corresondences between the elements of the two analogs. The constraint of semantic similarity supports mapping hypotheses to the degree that mapped predicates have similar meanings. The constraint of pragmatic centrality favors mappings involving elements the analogist believes to be important in order to achieve the purpose for (...) which the analogy is being used. The theory is implemented in a computer program called ACME (Analogical Constraint Mapping Engine), which represents constraints by means of a network of supporting and competing hypotheses regarding what elements to map. A cooperative algorithm for parallel constraint satisfaction identities mapping hypotheses that collectively represent the overall mapping that best fits the interacting constraints. ACME has been applied to a wide range of examples that include problem analogies, analogical arguments, explanatory analogies, story analogies, formal analogies, and metaphors. ACME is sensitive to semantic and pragmatic information if it is available, and yet able to compute mappings between formally isomorphic analogs without any similar or identical elements. The theory is able to account for empirical findings regarding the impact of consistency and similarity on human processing of analogies. (shrink)

John Dean, the former counsel to President Richard Nixon, testified to the Senate Watergate Investigating Committee about conversations that later turned out to have been tape recorded. Comparison of his testimony with the actual transcripts shows systematic distortion at one level of analysis combined with basic accuracy at another. Many of the distortions reflected Dean's own self-image; he tended to recall his role as more central than it really was. Moreover, his memory for even the “gist” of conversations was quite (...) poor except where that gist had been rehearsed in advance or frequently repeated. But while his testimony was often wrong in terms of the particular conversations he tried to describe, Dean was fundamentally right about what had been happening: the existence of a “cover-up” and the participation of various individuals in it. His testimony was accurate at a level that is neither “semantic” (since he was ostensibly describing particular episodes) nor “episodic” (since his accounts of the episodes were often wrong). The term “repisodic” is coined here to describe such memories: what seems to be a remembered episode actually represents a repeated series of events, and thus reflects a genuinely existing state of affairs. (shrink)