Distinct contributions of the magnocellular and parvocellular visual streams to perceptual selection.
Distinct contributions of the magnocellular and parvocellular visual streams to perceptual selection.
复制标题
大细胞和小细胞视觉流对知觉选择的独特贡献。
DOI：
10.1162/jocn_a_00121
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发表时间：
2012-01
影响因子：
3.2
通讯作者：
Silver MA
中科院分区：
文献类型：
--
作者：
Denison RN;Silver MA
在双眼竞争中，呈现给两只眼睛的相互冲突的图像会竞争感知优势，但这种竞争的神经基础存在争议。在眼间切换(IOS)竞争中，在两只眼睛之间周期性地交换的竞争图像产生两种类型的知觉交替中的一种：1)图像之间的快速、规则的交替，该交替被时间锁定到刺激开关，并且已被认为产生于较低级别的视觉处理层次的竞争；或者2)跨越多个刺激开关的缓慢、不规则的交替，其已经与视觉系统的较高水平相关联。这两种类型的知觉交替的存在对建立这样一种观点产生了影响，即竞争可以在视觉系统的多个层次上解决。我们改变了iOS竞争栅格的空间、时间和亮度属性，发现了快速、规则的知觉变化与大细胞流处理之间的联系，以及缓慢、不规则的变化与小细胞流处理之间的联系。大细胞流和小细胞流是两条早期的视觉通路，分别专门用于运动和形状的处理。这些结果为理解双眼竞争的神经基础提供了一个新的框架，强调了并行视觉处理流的重要性，而不仅仅是分层组织，在视觉环境中模糊的知觉解决中。
During binocular rivalry, conflicting images presented to the two eyes compete for perceptual dominance, but the neural basis of this competition is disputed. In interocular switch (IOS) rivalry, rival images periodically exchanged between the two eyes generate one of two types of perceptual alternation: 1) a fast, regular alternation between the images that is time-locked to the stimulus switches and has been proposed to arise from competition at lower levels of the visual processing hierarchy, or 2) a slow, irregular alternation spanning multiple stimulus switches that has been associated with higher levels of the visual system. The existence of these two types of perceptual alternation has been influential in establishing the view that rivalry may be resolved at multiple hierarchical levels of the visual system. We varied the spatial, temporal, and luminance properties of IOS rivalry gratings and found, instead, an association between fast, regular perceptual alternations and processing by the magnocellular stream and between slow, irregular alternations and processing by the parvocellular stream. The magnocellular and parvocellular streams are two early visual pathways that are specialized for the processing of motion and form, respectively. These results provide a new framework for understanding the neural substrates of binocular rivalry that emphasizes the importance of parallel visual processing streams, and not only hierarchical organization, in the perceptual resolution of ambiguities in the visual environment.