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:
The European journal of neuroscience
影响因子:
--
通讯作者:
Kitazawa S
Kitazawa S
中科院分区:
其他
文献类型:
--
作者:
Uchimura M;Nakano T;Morito Y;Ando H;Kitazawa S

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我们的大脑以自我为中心,在视网膜或颅视坐标系中代表视觉刺激的位置。此外,最近的行为学研究表明,刺激位置是相对于背景中的大画面自动向中心表示的。在这里,我们使用一种功能磁共振自适应技术来研究“背景坐标”的神经关联。一个红点被呈现在屏幕上的不同位置,同时一个矩形框也被呈现在不同的位置,而参与者则看着一个注视十字。当红点重复出现在相对于矩形框的相同位置时,右侧楔前叶的fMRI信号显著减少。在反复陈述后,没有观察到相对于一个小的、但显著的里程碑的适应。这些结果表明,背景坐标是在正确的楔前实施的。
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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