| Presentation | 2004/5/21 The representation of occluded objects in low-level visual regions: an fMRI Study Hiroshi BAN, Asuka NAKAGOSHI, Hiroki YAMAMOTO, Chuzo TANAKA, Masahiro UMEDA, Yoshimichi EJIMA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We can readily perceive the unity of objects that are partially obscured by occluding surfaces. We tested the possibility that the occluded structure was represented retinotopically somewhere in the visual cortex, using 1.5 and 3T fMRI. Target visual stimuli were rotating wedges. In a test condition, they passed behind the occluding objects. In a control condition, the occluding objects and the occluded segments of the wedges were removed. These stimuli caused a traveling wave of neural activity to sweep across the cortex. In V1 and V2, the phase topography consistent with the rotation of the occluded wedges was not observed. But, in V3 and V3A, the response phase tended to transit in the regions which retinotopically represented the occluder as if the occluded wedges were interpolated. It is suggested that the structural completion may originate from the middle stage of the visual pathway. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | fMRI / occlusion / retinotopy / low-level vision / object perception |
| Paper # | HIP2004-1 |
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| Committee | HIP |
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| Conference Date | 2004/5/21(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Human Information Processing (HIP) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | The representation of occluded objects in low-level visual regions: an fMRI Study |
| Sub Title (in English) | |
| Keyword(1) | fMRI |
| Keyword(2) | occlusion |
| Keyword(3) | retinotopy |
| Keyword(4) | low-level vision |
| Keyword(5) | object perception |
| 1st Author's Name | Hiroshi BAN |
| 1st Author's Affiliation | Graduate School of Human and Environmental Studies, Kyoto University() |
| 2nd Author's Name | Asuka NAKAGOSHI |
| 2nd Author's Affiliation | Faculty of Neurosurgery, Meiji University of Oriental Medicine |
| 3rd Author's Name | Hiroki YAMAMOTO |
| 3rd Author's Affiliation | Graduate School of Human and Environmental Studies, Kyoto University |
| 4th Author's Name | Chuzo TANAKA |
| 4th Author's Affiliation | Faculty of Medical Informatics, Meiji University of Oriental Medicine |
| 5th Author's Name | Masahiro UMEDA |
| 5th Author's Affiliation | Faculty of Medical Informatics, Meiji University of Oriental Medicine |
| 6th Author's Name | Yoshimichi EJIMA |
| 6th Author's Affiliation | Graduate School of Human and Environmental Studies, Kyoto University |
| Date | 2004/5/21 |
| Paper # | HIP2004-1 |
| Volume (vol) | vol.104 |
| Number (no) | 100 |
| Page | pp.pp.- |
| #Pages | 6 |
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