| Presentation | 2000/1/28 Size Perception of Visual Object Based on Vergence Chin Huat EWE, Takashi TAKEDA, Takeshi KASAI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Role of vergence signal in visual size perception has been investigated using a computer generated 3D pattern projection system. Two horizontally separatedred dots(10cm diameter)were projected alternately with 48Hz on a large front-parallel transparent screen(2.5m×2.5m)from behind, which was 50cm from a subject. Wearing a binocular liquid crystal shutter, a subject tried to reproduce the previous dot size with a joy stick, after the size, inter-dot separation, or both were changed suddenly by the computer. It has been proved that all of the subjects investigated(7male, 1female)perceived shrinking of the dot as vergence angle was increased. Thus, the subjects tried to enlarge the dot to reproduce the initial objective size. The extent of enlargement depended linearly on the dioptric distance of vergence. However, the size of the enlarged dot was much smaller than the value theoretically predicted, and also showed big individual difference(9～68% of theoretical prediction) among subjects. This implies that the brain over-estimates vergence signal, whih can cause overestimation of the pattern size. On the other hand, a possibility remains that vergence signal is correctly estimated, while expression of size via visual system is incorrect. To elucidate the possibility, the subjects were instructed to image suitable preshaping of the hand invisibly to grasp the object just before adjusting the pattern size. Two subjects clearly improved the performance of size reproduction(from 68% to 105%, and 10% to 48%), while other 3 subjects showed no improvement. The finding implies that some subjects estimate vergence rather correctly, and can estimate the objective pattern size with the aid of imagination of grasping the object. Other 3 subjects seem to have poor estimation ability of vergence. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | size perception / distance perception / vergence / binocular vision / prehension |
| Paper # | MBE99-127 |
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| Conference Information | |
| Committee | MBE |
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| Conference Date | 2000/1/28(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | ME and Bio Cybernetics (MBE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Size Perception of Visual Object Based on Vergence |
| Sub Title (in English) | |
| Keyword(1) | size perception |
| Keyword(2) | distance perception |
| Keyword(3) | vergence |
| Keyword(4) | binocular vision |
| Keyword(5) | prehension |
| 1st Author's Name | Chin Huat EWE |
| 1st Author's Affiliation | Graduate School of Engineering, Nagasaki Institute of Applied Science() |
| 2nd Author's Name | Takashi TAKEDA |
| 2nd Author's Affiliation | Department of Mechanical Engineering, Nagasaki Institute of Applied Science |
| 3rd Author's Name | Takeshi KASAI |
| 3rd Author's Affiliation | Faculty of Health and Sport Sciences, Osaka University |
| Date | 2000/1/28 |
| Paper # | MBE99-127 |
| Volume (vol) | vol.99 |
| Number (no) | 600 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |