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The Demise of the Identity Hypothesis and the Insufficiency and Nonnecessity of Contour Relatability in Predicting Object Interpolation
 

Summary: COMMENTS
The Demise of the Identity Hypothesis and the Insufficiency and
Nonnecessity of Contour Relatability in Predicting Object Interpolation:
Comment on Kellman, Garrigan, and Shipley (2005)
Barton L. Anderson
University of New South Wales
P. J. Kellman, P. Garrigan, and T. F. Shipley's (2005) theory of 3-dimensional object interpolation asserts
that existing data, as well as logical considerations, support the view that an identical contour interpo-
lation process underlies the interpolation of partially camouflaged and partially occluded objects (modal
completion and amodal completion, respectively). Here, the author argues that recent data show that this
theory is incorrect and that the logical arguments offered in support of the identity hypothesis depend on
specific unverified models of the phenomena in question. Alternative explanations of these effects are
developed to show that such phenomena do not logically implicate an identity hypothesis and, in some
cases, provide strong evidence against the identity hypothesis. Finally, the author describes several
completion phenomena that reveal that the relatability criteria embodied in Kellman et al.'s model are
neither necessary nor sufficient for understanding the interpolation processes the model was designed to
explain.
Keywords: completion, filling in, depth, occlusion
In a recent article, Kellman, Garrigan, and Shipley (2005) pro-
posed a simple three-dimensional (3D) extension of the model that

  

Source: Anderson, Barton L. - School of Psychology, University of Sydney

 

Collections: Biology and Medicine