| Object speed derived from the integration of motion in the image plane and motion-in-depth signaled by stereomotion and looming. | |
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MedLine Citation:
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PMID: 20156474 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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We investigate the influence of local motion in the retinal image plane on the perception of speed-in-depth. Observers judged the apparent speed-in-depth of a square plane of dynamic dots that moved towards the observer. Dots forming the surface of the plane underwent random-direction motion in the image plane. We examined the consequences of changing the dots' image-plane speed on the apparent speed of the stimulus as it traversed depth, where depth is signaled by stereomotion or looming. Results for both the stereomotion and looming conditions indicate that as the speed of random-direction motion in the image plane increases, the apparent speed-in-depth of the stimulus also increases. When stereomotion was used to signal motion-in-depth, the speed judgment is adequately modeled by the resultant of a vector sum of dot-speed in the image plane and speed-in-depth. However, when looming was used to define motion-in-depth, a different pattern of results was found - the apparent speed-in-depth is lower than the actual speed-in-depth, and the results are best predicted by simple averaging. Our results demonstrate that the integration of speed in the image plane and speed-in-depth, to determine object speed, is dependent on the type of cue used to signal motion-in-depth, and this difference is a consequence of the ways in which looming and stereomotion cue motion-in-depth. Looming is derived not at a local stage of motion analysis, but is available only via global integration of local velocities, and consequently global speed conforms to the average speed. Stereomotion, on the other hand, provides an effective cue for individuating local velocities in depth. |
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Authors:
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Sieu K Khuu; Terence C P Lee; Anthony Hayes |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-13 |
Journal Detail:
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Title: Vision research Volume: 50 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 904-13 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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The School of Optometry and Vision Science, The University of New South Wales, Sydney 2052, Australia. s.khuu@unsw.edu.au |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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