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Interaction of visual prior constraints

Examined the interaction of multiple prior visual constraints in the interpretation of ambiguous 3-dimensional shape stimuli from shading and parallel contours. The constraints were assumptions the O makes concerning the location of the light source (for the shading cue to depth) and the orientation of the surface (for depth based on image contours). The reliability of each of the 2 cues was manipulated by changing the contrast of different parts of the stimuli. Ss were 8 graduate students and postdoctoral fellows. A model was developed based on elements of Bayesian decision theory that tracked the weights applied to each of the prior constraints as a function of the cue reliabilities. The results provide evidence that prior constraints behave just like visual cues to depth: cues with more reliable information had higher weight attributed to their corresponding prior constraint. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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