Bridging the gap: global disparity processing in the human visual cortex
Bridging the gap: global disparity processing in the human visual cortex
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DOI：
10.1152/jn.01051.2011
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发表时间：
2012-05-01
影响因子：
2.5
通讯作者：
Norcia，Anthony M.
中科院分区：
文献类型：
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作者：
Cottereau，Benoit R.;McKee，Suzanne P.;Norcia，Anthony M.
人类的立体系统是显着的能力，利用广泛分离的功能作为参考，以支持精细的深度歧视。在寻找这种能力的可能的神经基质中，我们记录了高密度EEG，并使用分布式逆技术来估计五个感兴趣区域（ROI）中的群体水平差异反应：V1，V3A，hMT+，V4和外侧枕叶复合体（V3）。刺激是一个中央调制盘周围的相关的“参考”环提出的固定平面。我们改变了从0到5.5°的参数分离盘和环的间隙，作为长程视差积分的测试。在V1、V2和hMT+ ROI中，间隙>0.5°的响应等于在环境由不相关噪声（无参考）组成的对照条件下获得的响应。相比之下，在V4和V3A ROI中，间隙高达5.5°的响应仍然显著高于对照。作为视差参考信息的空间分布的测试，我们通过在中心和环绕之间或整个环绕中放置噪声来操纵刺激的属性。V3A ROI对中心和环形区域之间的视差噪声特别敏感，表明视差边缘检测器在该ROI中的重要贡献。
The human stereoscopic system is remarkable in its ability to utilize widely separated features as references to support fine depth discrimination. In a search for possible neural substrates of this ability, we recorded high-density EEG and used a distributed inverse technique to estimate population-level disparity responses in five regions of interest (ROIs): V1, V3A, hMT+, V4, and lateral occipital complex (LOC). The stimulus was a central modulating disk surrounded by a correlated “reference” annulus presented in the fixation plane. We varied a gap separating the disk from the annulus parametrically from 0 to 5.5° as a test of long-range disparity integration. In the V1, LOC, and hMT+ ROIs, the responses with gaps >0.5° were equal to those obtained in a control condition where the surround was composed of uncorrelated noise (no reference). By contrast, in the V4 and V3A ROIs, responses with gaps as large as 5.5° were still significantly higher than the control. As a test of the spatial distribution of the disparity reference information, we manipulated the properties of the stimulus by placing noise between the center and the surround or throughout the surround. The V3A ROI was particularly sensitive to disparity noise between the center and annulus regions, suggesting an important contribution of disparity edge detectors in this ROI.