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Full Idea
Goldstone's research has shown how learning concepts can change perceptual units. For example, perceptual discrimination is heightened along category boundaries.
Gist of Idea
Research shows perceptual discrimination is sharper at category boundaries
Source
Gregory L. Murphy (The Big Book of Concepts [2004], Ch.13)
Book Ref
Murphy,Gregory L.: 'The Big Book of Concepts' [MIT 2004], p.479
A Reaction
[Goldstone 1994, 2000] This is just the sort of research which throws a spanner into the simplistic a priori thinking of many philosophers.