Poster C130, Sunday, March 26, 5:00 – 7:00 pm, Pacific Concourse
The effect of border-ownership on perception of three dimensional object
Tomonori Ishizaki1, Masayuki Kikuchi1; 1Tokyo University of Technology
When we see a scene including objects, figure/ground separation occurs as the function of early and middle stages of the hierarchical visual information processing in the brain.The boundaries separating two adjacent retinal regions is attributed to only one side of them, namely figure region.The property is called as Border-Ownership (BO).Previous studies showed that BO affects the pattern recognition for 2D image.However, such a finding was obtained by the experiments using only 2D stimuli.This study performed psychophysical experiment addressing whether similar effect can be observed or not for 3D objects represented by random dots stereogram.The shapes of stimuli were hemispheres which have convex/concave sections created by adding several Gaussian-shaped local 3D patches whose positions and heights were randomly determined.Subjects were asked to perform matching task which required to choice one of the two object in the test stimuli having the same shape as the sample stimulus.When polarities of BO were the same between sample and test stimuli, correct rate was 88.0%.Meanwhile, when polarities of BO were different between sample and test stimuli, correct rate was 84.9%.Two-way ANOVA for repeated measurement showed that the former correct rate is significantly higher than the latter one(p<.05).Therefore, factors of BO in 3D space had significant effect for pattern recognition.This result suggests that 3D surface, which was formed as a border of the 3D region, has BO characteristic similar to 2D situation.
Topic Area: PERCEPTION & ACTION: Vision