Gestalt perception is associated with reduced parietal beta oscillations
Gestalt perception is associated with reduced parietal beta oscillations
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格式塔知觉与顶叶β振荡减少有关
DOI：
10.1016/j.neuroimage.2015.02.049
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发表时间：
2015
期刊：
影响因子：
5.7
通讯作者：
Bartels A
中科院分区：
文献类型：
--
作者：
Zaretskaya N;Bartels A
在复杂和杂乱的自然环境中，将复合物体作为一个整体来感知的能力是视觉感知的基础。这种能力可能是通过不同对象元素的神经表征之间增加的通信来介导的，并且已经与伽马波段中振荡脑活动的同步性增加相关联。以往的研究知觉分组要么引导注意力之间的局部和全局方面的一个给定的刺激或操纵其物理特性，以实现分组和未分组的知觉条件。与这些研究相反，我们完全匹配的物理属性的整体和局部感知使用的是一个刺激，使观众感知到多个元素的局部运动或两个虚幻的形状没有任何外部变化的全球运动。为了验证同步假设，我们用EEG记录了大脑活动，而人类参与者观察刺激并报告了他们感知的变化。与以前的研究结果相比，我们发现，权力的β-波段是较低的感知过程中的全球完形比在当地的元素。源定位将这些差异放置在后顶叶皮层，与先前与注意力和完形感知相关的部位重叠。这些发现揭示了顶叶β-带活动在内部的作用，而不是外部或注意力驱动的完形知觉过程。他们还增加了越来越多的证据，证明注意力和完形感知的共同神经基质都与顶叶皮层有关。
The ability to perceive composite objects as a whole is fundamental for visual perception in a complex and cluttered natural environment. This ability may be mediated by increased communication between neural representations of distinct object elements, and has been linked to increased synchronization of oscillatory brain activity in the gamma band. Previous studies of perceptual grouping either guided attention between local and global aspects of a given stimulus or manipulated its physical properties to achieve grouped and ungrouped perceptual conditions. In contrast to those studies, we fully matched the physical properties underlying global and local percepts using a bistable stimulus that causes the viewer to perceive either local motion of multiple elements or global motion of two illusory shapes without any external change. To test the synchronization hypothesis we recorded brain activity with EEG, while human participants viewed the stimulus and reported changes in their perception. In contrast to previous findings we show that power of the beta-band was lower during perception of global Gestalt than during that of local elements. Source localization places these differences in the posterior parietal cortex, overlapping with a site previously associated with both attention and Gestalt perception. These findings reveal a role of parietal beta-band activity in internally, rather than externally or attention-driven processes of Gestalt perception. They also add to the growing evidence for shared neural substrates of attention and Gestalt perception, both being linked to parietal cortex.
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影响因子：
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