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Effects of parametric manipulation of inter-stimulus similarity on 3D object categorization SHIMON EDELMAN 1,*, HEINRICH H. BÜLTHOFF2 and ISABELLE BÜLTHOFF2 1 School of Cognitive and Computing Sciences, University of Sussex, Falmer, BNI 9QH, UK 2 Max-Planck-Institut für Biologische Kybernetik, Spemannstrasse 38, D-72076 Tübingen, Germany Received 21 July 1998; revised 25 October 1998; accepted 1 November 1998 Abstract-To explore the nature of the representation space of 3D objects, we studied human performance in forced-choice categorization of objects composed of four geon-like parts emanating from a common center. Two categories were defined by prototypical objects, distinguished by qualitative properties of their parts (bulging vs waist-like limbs). Subjects were trained to discriminate between the two prototypes (shown briefly, from a number of viewpoints, in stereo) in a 1-interval forced-choice task, until they reached a 90% correct-response performance level. After training, in the first experiment, 11 subjects were tested on shapes obtained by varying the prototypical parameters both orthogonally (ORTHO) and in parallel (PARA) to the line connecting the prototypes in the parameter space. For the eight subjects who performed above chance, the error rate increased with the ORTHO parameter-space displacement between the stimulus and the corresponding prototype; the effect of the
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1999
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