Automatic representation of a visual stimulus relative to a background in the right precuneus |
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| Authors: | Motoaki Uchimura Tamami Nakano Yusuke Morito Hiroshi Ando Shigeru Kitazawa |
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| Affiliation: | 1. Dynamic Brain Network Laboratory, Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan;2. Department of Brain Physiology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan;3. Japan Society for the Promotion of Science, 5‐3‐1 Kojimachi, Chiyoda, Tokyo, Japan;4. Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology, Osaka University, Suita, Osaka, Japan;5. Multisensory Cognition and Computation Laboratory, National Institute of Information and Communications Technology, 3‐5 Hikaridai, Seika, Kyoto, Japan |
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| Abstract: | Our brains represent the position of a visual stimulus egocentrically, in either retinal or craniotopic coordinates. In addition, recent behavioral studies have shown that the stimulus position is automatically represented allocentrically relative to a large frame in the background. Here, we investigated neural correlates of the ‘background coordinate’ using an fMRI adaptation technique. A red dot was presented at different locations on a screen, in combination with a rectangular frame that was also presented at different locations, while the participants looked at a fixation cross. When the red dot was presented repeatedly at the same location relative to the rectangular frame, the fMRI signals significantly decreased in the right precuneus. No adaptation was observed after repeated presentations relative to a small, but salient, landmark. These results suggest that the background coordinate is implemented in the right precuneus. |
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| Keywords: | adaptation background egocentric
fMRI
precuneus |
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