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Journal of Vision (2004) 4, 552-563 http://journalofvision.org/4/7/3/ 552 Junctions and cost functions in motion interpretation
 

Summary: Journal of Vision (2004) 4, 552-563 http://journalofvision.org/4/7/3/ 552
Junctions and cost functions in motion interpretation
Josh McDermott
Department of Brain and Cognitive Science MIT,
Cambridge, MA, USA
Gatsby Computational Neuroscience Unit,
University College, London, London, UK
Edward H. Adelson
Department of Brain and Cognitive Science MIT,
Cambridge, MA, USA
Form, motion, occlusion, and perceptual organization are intimately related. We sought to assess the role of junctions in
their interaction. We used stimuli based on a cross moving within an occluding aperture. The two bars of the cross appear
to cohere or move separately depending on the context; in accord with prior literature, motion interpretation depends in
part on whether the bar endpoints appear to be occluded. To test the importance of junctions in motion interpretation, we
explored the effect of changing the junctions generated at the occlusion points in our stimuli, from T-junctions to L-
junctions. In some cases, this change had a large effect on perceived motion; in others, it made little difference,
suggesting junctions are not the critical variable. Further experiments suggested that what matters is not junctions per se,
but whether illusory contours are introduced when the junction category is changed. Our results are consistent with an
optimization-based computation that seeks to minimize the presence of illusory contours in the perceptual representation.
Although it may be possible to explain our results with interactions between junctions, parsimony favors an explanation in

  

Source: Adelson, Edward - Computer Science and Artificial Intelligence Laboratory, Department of Brain and Cognitive Science, Massachusetts Institute of Technology (MIT)

 

Collections: Biology and Medicine