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. Author manuscript; available in PMC: 2018 Oct 23.
Published in final edited form as: Phys Life Rev. 2008 Dec 14;6(2):53–84. doi: 10.1016/j.plrev.2008.12.001

Figure 2.

Figure 2.

Stimuli used in unitization experiment by Goldstone (2000). Each top contour is composed of 5 contour segments (labeled A-E). Categorization training in which a consistent arrangement (e.g., ABCDE) was discriminated from items differing by one component led to performance that indicated formation of a new perceptual unit or discovery of higher-order shape invariants (See text.)