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Neural mechanisms of perceptual grouping in human visual cortex

机译：视觉皮层感知分组的神经机制

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The current work examined neural substrates of perceptual grouping in human visual cortex using event-related potential (ERP) recording. Stimulus arrays consisted of local elements that were either evenly spaced (uniform stimuli) or grouped into columns or rows by proximity or color similarity (grouping stimuli). High-density ERPs were recorded while subjects identified orientations of perceptual groups in stimulus arrays elicited that were presented randomly in one of the four quadrants of the visual field. Both uniform and grouping stimulus arrays elicited an early ERP component (C1), which peaked at about 70 ms after stimulus onset and changed its polarity as a function of stimulated elevations. Dipole modeling based on realistichead boundary-element models revealed generators of the C1 component in the calcarine cortex. The C1 was modulated by perceptual grouping of local elements based on proximity, and this grouping effect was stronger in the upper than in the lower visual field. The findings provide ERP evidence for the engagement of human primary visual cortex in the early stage of perceptual grouping.
机译：当前的工作使用事件相关电位（ERP）记录检查了人类视觉皮层中感知分组的神经基质。刺激阵列由均匀分布（均匀刺激）或按接近度或颜色相似性（分组刺激）分为列或行的局部元素组成。记录高密度的ERPs，同时受试者在刺激阵列中识别出感知组的方向，这些刺激组随机出现在视野的四个象限之一中。均匀刺激阵列和分组刺激阵列均会引起早期的ERP组件（C1），该组件在刺激开始后约70 ms达到峰值，并根据刺激的升高改变其极性。基于逼真的头部边界元素模型的偶极子建模揭示了钙car碱皮层中C1成分的生成器。 C1通过基于邻近度的局部元素的感知分组进行调制，并且该分组效果在上部视野中强于在下部视野中。这些发现为ERP证据提供了人类初级视觉皮层在知觉分组的早期阶段的参与。

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