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首页> 外文期刊>The European Journal of Neuroscience >Automatic representation of a visual stimulus relative to a background in the right precuneus
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Automatic representation of a visual stimulus relative to a background in the right precuneus

机译:视觉刺激相对于右胎前背景的自动表示

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摘要

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.
机译:我们的大脑以视网膜或颅底坐标为中心,以自我为中心表示视觉刺激的位置。此外,最近的行为研究表明,相对于背景中的大框架,刺激位置自动以等心轴表示。在这里,我们使用fMRI适应技术研究了背景坐标的神经相关性。在屏幕上的不同位置出现了一个红点,同时矩形框也出现在了不同的位置,而参与者看着一个注视十字。当在相对于矩形框的相同位置重复出现红点时,右核前部的fMRI信号明显降低。相对于一个较小但明显的标志性建筑,重复演示后未观察到适应。这些结果表明,背景坐标是在正确的胎前实施的。

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