Automatic representation of a visual stimulus relative to a background in the right precuneus.
Automatic representation of a visual stimulus relative to a background in the right precuneus.
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DOI:
10.1111/ejn.12935
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发表时间:
2015-07
期刊:
影响因子:
--
通讯作者:
Kitazawa S
中科院分区:
文献类型:
--
作者:
Uchimura M;Nakano T;Morito Y;Ando H;Kitazawa S
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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