1991 Fiscal Year Final Research Report Summary
A Basic Study on Visual Motion Recognition Processes from the Point of View of Spatial Information Processing Approach
| Project/Area Number |
63410002
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Psychology
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| Research Institution | Hokkaido University |
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Principal Investigator |
AIDA Satoru Hokkaido University Dept. Behavioral Sci. Professor, 文学部, 教授 (40000559)
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| Co-Investigator(Kenkyū-buntansha) |
TAYAMA Tadayuki Hokkaido University Dept. Behavioral Sci. instructor, 文学部, 助手 (50163704)
TAKIGAWA Tetsuo Hokkaido University Dept. Behavioral Sci. Associate Prof., 文学部, 助教授 (30098503)
ABE Jun-ichi Hokkaido University Dept. Behavioral Sci. Associate Prof., 文学部, 助教授 (40091409)
IMAI Shiro Hokkaido University Dept. Behavioral Sci. Professor, 文学部, 教授 (70000586)
TERAOKA Takashi Hokkaido University Dept. Behavioral Sci. Professor, 文学部, 教授 (70000552)
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| Project Period (FY) |
1988 – 1991
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| Keywords | correspondence problem / vernier alignment / adaptation to moving grating / apparent velocity / radial motion / time derivative / Fraser illusion / theory of situational structure |
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| Research Abstract |
During the 4 year period in which the grant was granted to us, the following principal discoveries have been made.
1) The factors modifying the mode of appearance of apparent motion was investigated. It was found that not only the characteristics of the physical dimensions of the stimulus but also such topdown relationships as phonemes associated to particular letters determine the correspondence between two stimuli that cause apparent motion.
2) Vernier-type alignment judgment was made for sine-wave gratings placed side by side. The acuity was more or less as expected from the conventional contrast sensitivity functions related to the grating but, when FM component was introduced, acuity increased as amplitude and frequency of that component were made greater.
3) The effects of adaptation to a moving grating upon apparent velocity of another moving grating was studied. It was found that it has a decelerating effect but the effect was independent of the direction of adapting grating, at least for high velocity test grating.
4) The stimulus cues that determine apparent velocity of a target in radial (approaching) motion as well as the time taken for it to reach the observer (the collision time) were studied. The time derivative of the change in the size of the retinal image was found to be one of them. When the target was shown intermittently, the localization of the target was done by interpolation which varies according to the actual mode of presentation.
5) The dynamic optical illusion was studied using Fraser's figure. It was found that contraction/expansion of this illusion was more pronounced when the figure was rotated in comparison to an ordinary spiral figure in a similar condition.
6) A theoretical analysis of the space in which motion takes place was attempted by a view-point named "theory of situational structures'.
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