Article

Similarity

Robert L. Goldstone and Ji Yun Son

in The Oxford Handbook of Thinking and Reasoning

Published in print March 2012 | ISBN: 9780199734689
Published online November 2012 | | DOI: http://dx.doi.org/10.1093/oxfordhb/9780199734689.013.0010

Series: Oxford Library of Psychology

 Similarity

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  • Cognitive Psychology
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Humans and other animals perceive and act on the basis of similarities among things because similarities are usually informative. Similar things usually behave similarly, and because we can grasp these similarities, we can organize and predict the things in our world. Four major classes of models have been proposed for how humans assess similarities. In geometric models, entities are represented by their positions in a multidimensional space, and similarity is based on the proximity of entities in this space. In featural models, entities are described by their features, and the similarity of entities is an increasing function of their shared features and/or a decreasing function of their unique features. In alignment-based models, the similarity between two structured entities is calculated by placing the elements of their structures into correspondence. In transformational models, the similarity between two entities is conceptualized as the number of transformations required to transform one entity into the other. We discuss issues related to the flexibility and constraints of similarity, and how similarity grounds other cognitive processes.

Keywords: similarity; multidimensional scaling; induction; categorization; contrast model; relations; alignment; structural representations; transformations; grounding

Article.  15170 words. 

Subjects: Psychology ; Cognitive Psychology ; Cognitive Neuroscience

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