| Presentation | 2006/5/22 Neural Activity Corresponding to Occluded Surface Completion and Its Dependency on Temporal and Spatial Perceptual Context : an fMRI Study Hiroshi Ban, Hiroki Yamamoto, Takashi Hanakawa, Shin-ichi Urayama, Hidenao Fukuyama, Yoshimichi Ejima, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We can readily perceive the unity of an object even when it is partially occluded (Amodal Completion). We explored brain activity that related to the completion. Visual stimuli consisted of a rotating wedge and two occluders whose spatial and temporal configurations were manipulated. In a standard session, the wedge rotated around a fixation point while two occluders were stable in the lower-left and upper-right visual fields. This periodic rotation of the wedge caused a traveling wave of neural activity to sweep across the cortex. First, we tested whether the occluded structure was represented topographically. Even when the wedge passed behind the occluders, the phase topography in early visual areas, especially in V1 and V2, was consisted with the wedge rotation as if the occluded segment of the wedge was interpolated. In contrast, no completion effect was observed when the occluders and an occluded segment of the wedge were removed. Next, we investigated whether the neural response to the obscured surface depended on the previous appearance of a whole object seen before occlusion. When not a whole but two divided wedges were displayed before occlusion, no significant response to the obscured surface was observed. Altogether, it is suggested that low-level visual areas play an important role for visual completion in both spatial and temporal context. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | fMRI / visual cortex / retinotopy / amodal completion / shape/object perception |
| Paper # | HCS2006-10,HIP2006-10 |
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| Committee | HIP |
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| Conference Date | 2006/5/22(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | Neural Activity Corresponding to Occluded Surface Completion and Its Dependency on Temporal and Spatial Perceptual Context : an fMRI Study |
| Sub Title (in English) | |
| Keyword(1) | fMRI |
| Keyword(2) | visual cortex |
| Keyword(3) | retinotopy |
| Keyword(4) | amodal completion |
| Keyword(5) | shape/object perception |
| 1st Author's Name | Hiroshi Ban |
| 1st Author's Affiliation | Graduate School of Human & Environmental Studies, Kyoto University:Research Fellow of the Japan Society for the Promotion of Science() |
| 2nd Author's Name | Hiroki Yamamoto |
| 2nd Author's Affiliation | Graduate School of Human & Environmental Studies, Kyoto University |
| 3rd Author's Name | Takashi Hanakawa |
| 3rd Author's Affiliation | Human Brain Research Center, Graduate School of Medicine, Kyoto University |
| 4th Author's Name | Shin-ichi Urayama |
| 4th Author's Affiliation | Human Brain Research Center, Graduate School of Medicine, Kyoto University |
| 5th Author's Name | Hidenao Fukuyama |
| 5th Author's Affiliation | Human Brain Research Center, Graduate School of Medicine, Kyoto University |
| 6th Author's Name | Yoshimichi Ejima |
| 6th Author's Affiliation | Kyoto Institute of Technology |
| Date | 2006/5/22 |
| Paper # | HCS2006-10,HIP2006-10 |
| Volume (vol) | vol.106 |
| Number (no) | 84 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |