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The effects of amodal completion and perceived causality on apparent motion
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Kim, Sung-Ho. The effects of amodal completion and perceived causality on apparent motion. Retrieved from https://doi.org/doi:10.7282/T3J965GS

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TitleThe effects of amodal completion and perceived causality on apparent motion
NameKim, Sung-Ho (author); Feldman, Jacob (chair); Singh, Manish (co-chair); Papathomas, Thomas (internal member); Scholl, Brian (outside member); Rutgers University; Graduate School - New Brunswick
Date Created2011
Other Date2011-10 (degree)
SubjectPsychology, Motion, Causation
Extentvi, 100 p. : ill.
DescriptionThe research presented in this dissertation concerns two ecologically important motion events in the dynamic world: occlusion of moving objects and causal interaction between objects. I investigate how the real-world regularities underlying these events were incorporated as constraints on the percept of underspecified, ambiguous apparent motion; how they constrain the process of interpolating and inferring the most plausible and coherent motion events from apparent motion displays. The first study (Chapter 2) examines whether illusory occlusion of a moving object can bias an apparent motion towards longer curved paths behind an occluder, which would violate the well-established principle that apparent motion follows the shortest possible path. Observers viewed motion sequences of two alternating rectangular targets positioned at the ends of a semicircular “tube,” with varying inter-stimulus intervals (ISIs). The results confirm that curved-path motion can be induced by the presence of the curved occluder. Furthermore, a curved path was most likely with long ISIs, objects less tall and close to the occluder, U-shaped tube occluders, and binocular depth cues, which are consistent with physical plausibility of occlusion. The second study (Chapter 3) investigates whether the path of apparent motion can be influenced by context motion which cues a Michotte-style "launch". The display used in Chapter 3 includes two context objects which appeared to be hit by the motion tokens at their onsets, in the direction of either the straight path or the curved path behind the curved occluder. Subjects in these experiments almost exclusively perceived a motion path in the direction of the launch, regardless of ISI, suggesting a very strong bias in the direction of perceived momentum. In sum, the results of this dissertation suggest that (1) The amodal representation of a fully hidden object behind an occluder can bridge the gap between two token locations via a curved trajectory so as for the visual system to maintain object persistence, and (2) the launching effect strongly induces a motion path in the direction of launching. The findings provide evidence that apparent motion is perceived in a consistent way with real-world regularities underlying motion events of occlusion and physical collision.
NotePh.D.
NoteIncludes bibliographical references
NoteIncludes vita
Noteby Sung-Ho Kim
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3J965GS
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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