MAC/FAC: A Model of Similarity-Based Retrieval
Article first published online: 11 FEB 2010
© 1995 Cognitive Science Society, Inc.
Volume 19, Issue 2, pages 141–205, April 1995
How to Cite
Forbus, K. D., Gentner, D. and Law, K. (1995), MAC/FAC: A Model of Similarity-Based Retrieval. Cognitive Science, 19: 141–205. doi: 10.1207/s15516709cog1902_1
- Issue published online: 11 FEB 2010
- Article first published online: 11 FEB 2010
We present a model of similarity-based retrieval that attempts to capture three seemingly contradictory psychological phenomena: (a) structural commonalities are weighed more heavily than surface commonalities in similarity judgments for items in working memory; (b) in retrieval, superficial similarity is more important than structural similarity; and yet (c) purely structural (analogical) remindings e sometimes experienced. Our model, MAC/FAC, explains these phenomena in terms of a two-stage process. The first stage uses a computationally cheap, non-structural matcher to filter candidate long-term memory items. It uses content vectors, a redundant encoding of structured representations whose dot product estimates how well the corresponding structural representations will match. The second stage uses SME (structure-mapping engine) to compute structural matches on the handful of items found by the first stage. We show the utility of the MAC/FAC model through a series of computational experiments: (a) We demonstrate that MAC/FAC can model patterns of access found in psychological data; (b) we argue via sensitivity analyses that these simulation results rely on the theory; and (c) we compare the performance of MAC/FAC with ARCS, an alternate model of similarity-based retrieval, and demonstrate that MAC/FAC explains the data better than ARCS. Finally, we discuss limitations and possible extensions of the model, relationships with other recent retrieval models, and place MAC/FAC in the context of other recent work on the nature of similarity.