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The duration of 3D form analysis in transformational apparent motion. Perception (2002)
| Venue: | Psychophysics |
| Citations: | 18 - 7 self |
BibTeX
@ARTICLE{Tse02theduration,
author = {Peter Ulric Tse and Nikos K. Logothetis},
title = {The duration of 3D form analysis in transformational apparent motion. Perception},
journal = {Psychophysics},
year = {2002},
volume = {64},
pages = {244--265}
}
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Abstract
Transformational apparent motion (TAM) occurs when a figure changes discretely from one configuration to another overlapping configuration. Rather than an abrupt shape change, the initial shape is perceived to transform smoothly into the final shape as if animated by a series of intermediate shapes. We find that TAM follows an analysis of form that takes 80–140 msec. Form analysis can function both at and away from equiluminance and can occur over contours defined by uniform regions as well as outlines. Moreover, the forms analyzed can be 3-D, resulting in motion paths that appear to smoothly project out from or into the stimulus plane. The perceived transformation is generally the one that involves the least change in the shape or location of the initial figure in a 3-D sense. We conclude that perception of TAM follows an analysis of 3-D form that takes,100 msec. This stage of form analysis may be common to both TAM and second-order motion. When two nonoverlapping figures are flickered in succession within a certain range of spatiotemporal offsets (Korte, 1915), they appear to comprise a single object jumping rigidly back and forth in translational apparent motion. Because no object actually moves in the world, the
Keyphrases
form analysis transformational apparent motion final shape 3-d form certain range second-order motion initial figure nonoverlapping figure perceived transformation stimulus plane intermediate shape 3-d sense motion path initial shape spatiotemporal offset translational apparent motion uniform region single object abrupt shape change
