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Categorical local-shape perception

Characterized the human ability to categorize local solid shape in terms of viewpoint-independent descriptions. The stimulus was a croissant-shaped object obtained from bending the long axis of an ellipsoid of revolution along a circular arc. Four adult Os sat in a dark room with their heads rested in a chin rest and were tasked to identify a point highlighted in red on the screen surface as being either elliptic or hyperbolic. Results showed that the shape characteristic is a viewpoint-independent descriptor which distinguished hyperbolic from elliptic shapes, but not concave from convex. Results suggest that the number of times a point was judged to be elliptic by an O was a monotonic function of the shape characteristic. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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