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. 2012 Mar 22;42(11):2445–2452. doi: 10.1017/S0033291712000451

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Copyright © Cambridge University Press 2012 The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.

The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.

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Fig. 2 — Scatterplots relating performance in (a) Hotel, (b) Faux Pas and (c) Mind in the Eyes to Raven's Colored Progressive Matrices (RCPM) for patients with Parkinson's disease (PD) (circles) and controls (crosses). Regression lines (broken for PD and solid for controls) reflect the average within-group association of the two variables, as determined by ANCOVA, constrained to have the same slope across groups.