An Orientation Map for Motion Boundaries in Macaque V2
An Orientation Map for Motion Boundaries in Macaque V2
复制标题
Macaque V2 运动边界的方向图
DOI：
10.1093/cercor/bhu235
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发表时间：
2016-01-01
期刊：
影响因子：
3.7
通讯作者：
Lu, Haidong D.
中科院分区：
文献类型：
--
作者：
Chen, Ming;Li, Peichao;Lu, Haidong D.
提取运动物体形状的能力是视觉感知的基础。然而，在视觉系统中处理这种计算的位置是未知的。为了解决这个问题，我们使用内在信号光学成像在清醒的猴子检查皮层反应的感知轮廓定义的运动对比度（运动边界，MB）。我们发现，MB刺激引起一个强大的V2区的方向反应。从正交MB刺激的减法得到的方向图与用亮度光栅（LG）获得的方向图对齐良好。与此相反，V1区对LG反应良好，但对MB的定向反应弱得多。我们进一步表明，V2方向域响应于运动对比度，这是在V2中检测MB所需的。这些结果表明，V2代表MB信息，形状识别和图形-背景分离的重要先决条件。
The ability to extract the shape of moving objects is fundamental to visual perception. However, where such computations are processed in the visual system is unknown. To address this question, we used intrinsic signal optical imaging in awake monkeys to examine cortical response to perceptual contours defined by motion contrast (motion boundaries, MBs). We found that MB stimuli elicit a robust orientation response in area V2. Orientation maps derived from subtraction of orthogonal MB stimuli aligned well with the orientation maps obtained with luminance gratings (LGs). In contrast, area V1 responded well to LGs, but exhibited a much weaker orientation response to MBs. We further show that V2 direction domains respond to motion contrast, which is required in the detection of MB in V2. These results suggest that V2 represents MB information, an important prerequisite for shape recognition and figure-ground segregation.