The cortical areas that process disparity-defined motion-in-depth (i.e., cyclopean stereomotion [CSM]) were characterized with functional magnetic resonance imaging (fMRI) in two awake, behaving macaques. The experimental protocol was similar to previous human neuroimaging studies. We contrasted the responses to dynamic random-dot patterns that continuously changed their binocular disparity over time with those to a control condition that shared the same properties, except that the temporal frames were shuffled. A whole-brain voxel-wise analysis revealed that in all four cortical hemispheres, three areas showed consistent sensitivity to CSM. Two of them were localized respectively in the lower bank of the superior temporal sulcus (CSM_STS) and on the neighboring infero-temporal gyrus (CSM_ITG). The third area was situated in the posterior parietal cortex (CSM_PPC). Additional regions of interest-based analyses within retinotopic areas defined in both animals indicated weaker but significant responses to CSM within the MT cluster (most notably in areas MSTv and FST). Altogether, our results are in agreement with previous findings in both human and macaque and suggest that the cortical areas that process CSM are relatively well preserved between the two primate species.

中文翻译：

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非人类灵长类大脑中的立体运动处理。

处理视差定义的深度运动（即，独眼立体运动 [CSM]）的皮质区域在两只清醒的行为猕猴中用功能磁共振成像 (fMRI) 表征。实验方案类似于以前的人类神经影像学研究。我们将动态随机点模式的响应与那些共享相同属性的控制条件的响应进行了对比，这些模式随着时间的推移不断改变其双目视差，除了时间帧被改组。全脑体素分析显示，在所有四个皮质半球中，三个区域对 CSM 表现出一致的敏感性。其中两个分别位于颞上沟下岸（CSM _STS）和邻近的颞下回（CSM _ITG））。第三个区域位于后顶叶皮层 (CSM _PPC )。在两种动物中定义的视网膜区域内的其他基于兴趣的分析区域表明对 MT 集群内的 CSM 较弱但显着的反应（最显着的是在区域 MSTv 和 FST）。总而言之，我们的结果与之前在人类和猕猴中的发现一致，并表明处理 CSM 的皮层区域在两种灵长类动物之间相对保存完好。