Rejection of false matches for binocular correspondence in macaque visual cortical area V4
Rejection of false matches for binocular correspondence in macaque visual cortical area V4
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DOI：
10.1523/jneurosci.5292-03.2004
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发表时间：
2004-09-15
影响因子：
5.3
通讯作者：
Fujita, I
中科院分区：
文献类型：
--
作者：
Tanabe, S;Umeda, K;Fujita, I
通过观察随机点立体图（RDS），可以用轻微的双眼视差生动地感知深度平面。通过颠倒一只眼睛看到的点的对比度来产生反相关的RDS，就会失去对飞机深度的感知。从计算角度来看，视觉系统无法找到一个全局一致的解决方案来匹配反相关RDS的左眼和右眼图像。因此，在反相关RDS中，全局匹配的神经表征应该对双眼视差不敏感。纹状皮层（V1）中的大多数神经元在反相关rds中响应双眼视差，这表明在纹状皮层外区进一步的皮质处理是充分考虑匹配计算的必要条件。我们检查了猴子视觉皮层V4区对动态rds的神经反应，包括正常（相关）和反相关。超过一半的V4细胞对嵌入在相关RDS中的水平差异敏感。当RDS呈反相关时，它们对差异的选择性大大减弱。这种衰减从反应开始就很明显，并且衰减的程度与神经元反应潜伏期无关。与V1神经元对反相关rds的差异调节不同，V4神经元的差异调节不是对正常rds的反转。我们的研究结果表明，V1阶段引起的左右眼图像中对比度相反的点之间的错误匹配反应在V4阶段大大减少。
A plane lying in depth is vividly perceived by viewing a random-dot stereogram (RDS) with a slight binocular disparity. Perception of a plane-in-depth is lost by reversing the contrast of dots seen by one of the eyes to generate an anticorrelated RDS. From a computational perspective, the visual system cannot find a globally consistent solution for matching the left and right eye images of an anticorrelated RDS. The neural representation of a global match should therefore be insensitive to binocular disparity in an anticorrelated RDS. Most neurons in the striate cortex (V1) respond to binocular disparity in anticorrelated RDSs, suggesting that further cortical processing in extrastriate areas is necessary to fully account for the matching computation. We examined neural responses to dynamic RDSs, both normal ( correlated) and anticorrelated, in area V4 of the monkey visual cortex. More than half of the V4 cells were sensitive to the horizontal disparity embedded in a correlated RDS. Most of them greatly attenuated their selectivity for disparity when the RDS was anticorrelated. This attenuation was apparent from the response onset, and the degree of attenuation did not correlate with neuronal response latencies. Unlike the disparity tuning of V1 neurons to anticorrelated RDSs, that of V4 neurons was not an inversion of tuning to normal RDSs. Our results suggest that responses to false matches between contrast-reversed dots in the left and right eye images elicited in V1 are substantially reduced by the stage of V4.