In a recent study, researchers analyzed individuals with Prader Willi ability to complete puzzles. The researchers determined that individuals with Prader-Willi Syndrome rely on piece shape rather than a picture focused strategy. Individuals with Prader-Willi performed better on achromatic puzzles than the control group. When a puzzles with pictures were used scores did not differ between the two groups.
Reference: Brian N. Verdine, Georgene L. Troseth, Robert M. Hodapp, and Elisabeth M. Dykens (2008) Strategies and Correlates of Jigsaw Puzzle and Visuospatial Performance by Persons With Prader-Willi Syndrome American Journal on Mental Retardation: Vol. 113, No. 5, pp. 343–355. doi: 10.1352/2008.113:342-355
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