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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Shape perception reduces activity in human primary visual cortex
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Shape perception reduces activity in human primary visual cortex

机译：形状感知会减少人类初级视觉皮层的活动

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摘要

Visual perception involves the grouping of individual elements into coherent patterns that reduce the descriptive complexity of a visual scene. The physiological basis of this perceptual simplification remains poorly understood. We used functional MRI to measure activity in a higher object processing area, the lateral occipital complex, and in primary visual cortex in response to visual elements that were either grouped into objects or randomly arranged. We observed significant activity increases in the lateral occipital complex and concurrent reductions of activity in primary visual cortex when elements formed coherent shapes, suggesting that activity in early visual areas is reduced as a result of grouping processes performed in higher areas. These findings are consistent with predictive coding models of vision that postulate that inferences of high-level areas are subtracted from incoming sensory information in lower areas through cortical feedback.
机译：视觉感知涉及将各个元素分组为连贯的模式，从而减少视觉场景的描述复杂性。这种知觉简化的生理基础仍然知之甚少。我们使用功能性MRI来测量较高的对象处理区域，外侧枕骨复合体和主要视觉皮层中的活动，以响应被分为对象或随机排列的视觉元素。当元件形成连贯的形状时，我们观察到外侧枕叶复合体的活动显着增加，同时主视觉皮层的活动同时减少，这表明早期视觉区域的活动由于在较高区域进行的分组过程而减少。这些发现与视觉的预测编码模型一致，该模型假定通过皮层反馈从较低区域的传入感觉信息中减去高层区域的推断。

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