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. Author manuscript; available in PMC: 2008 Dec 1.
Published in final edited form as: Appl Prev Psychol. 2007 Dec;12(3):99–114. doi: 10.1016/j.appsy.2007.09.004

Figure 4.

Figure 4

Example trials from the test of dimensional shifts and discrimination reversals (adapted from Dias et al., 1996). Trials feature two compound stimuli consisting of line exemplars overlaid on polygon exemplars. Correct choices are indicated by a plus (+), incorrect choices are indicated by a minus (−). a) Compound discrimination: The participant must first identify the correct exemplar (e.g., the triangle) from the correct dimension (e.g., the polygons). b) Correct performance requires retaining the selection rule across trials. c) Intra-dimensional shift: A new exemplar (diamond) in the same dimension (polygons) becomes the correct stimulus. d) Extra-dimensional shift: An exemplar from the other dimension (lines) becomes correct. e) Discrimination reversal: Stimuli from the previous trial are retained, but the previously correct stimulus becomes incorrect and vice-versa.