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Perceptual biases in the interpretation of non-rigid structure from motion
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Choi, Ryne. Perceptual biases in the interpretation of non-rigid structure from motion. Retrieved from https://doi.org/doi:10.7282/t3-hr7g-kw11

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TitlePerceptual biases in the interpretation of non-rigid structure from motion
NameChoi, Ryne (author); Singh, Manish (chair); Feldman, Jacob (internal member); Kowler, Eileen (internal member); Rutgers University; School of Graduate Studies
Date Created2020
Other Date2020-05 (degree)
SubjectStructure from motion, Motion perception (Vision), Psychology
Extent1 online resource (vi, 25 pages) : illustrations
DescriptionWhile structure-from-motion (SFM) studies have largely focused on the perception of rigidly moving 3D objects, recent studies have shown that observers are good at perceiving certain kinds of non-rigid transformations parencite{Jain2011}. Our overarching goal is to understand what types of non-rigid transformations are perceivable in SFM. As a first step towards this goal, this study investigates the role of biological plausibility of shape transformations.

Experiment 1 compared the perception of two non-rigid transformations: part-orientation change (which is more common in animate motion, e.g. part-wise articulation of limbs) and part-length change (which is less common). Stimuli consisted of an ellipsoid with a protruding part that underwent a non-rigid length change as the whole object rotated back and forth. We manipulated the extent of length change and subjects judged whether the part was undergoing a length or orientation change. In this experiment, the image of the part was always contained within the silhouette of the ellipsoid. Results showed a clear range where length change was misperceived as orientation change.

Experiment 2 further investigated the misperception of non-rigid length change. The part was now visible in the silhouette. We observed a misperception of non-rigid length change as a rigidly-attached part with an "illusory" non-orthogonal horizontal angle relative to the ellipsoid. Observers adjusted the perceived angle between the part and the ellipsoid. We then compared the perceived horizontal angle to model predictions based on a reinterpretation of the length change in terms of a fixed horizontal angle between the part and the main body, with no length change. Even with no free parameters, the model closely tracked observers’ data.

In summary, an SFM stimulus in which a part undergoes a length change, tends to be misperceived either as an orientation change (Exp. 1), or as a fixed but "illusory" orientation (Exp. 2). The results suggest that the visual system may be biased towards more biologically plausible interpretations of non-rigid motion.
NoteM.S.
NoteIncludes bibliographical references
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/t3-hr7g-kw11
LanguageEnglish
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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