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首页> 外文期刊>Journal of Neurophysiology >Representation of 3-D surface orientation by velocity and disparity gradient cues in area MT.
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Representation of 3-D surface orientation by velocity and disparity gradient cues in area MT.

机译：通过区域MT中的速度和视差梯度提示来表示3-D表面方向。

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Neural coding of the three-dimensional (3-D) orientation of planar surface patches may be an important intermediate step in constructing representations of complex 3-D surface structure. Spatial gradients of binocular disparity, image velocity, and texture provide potent cues to the 3-D orientation (tilt and slant) of planar surfaces. Previous studies have described neurons in both dorsal and ventral stream areas that are selective for surface tilt based on one or more of these gradient cues. However, relatively little is known about whether single neurons provide consistent information about surface orientation from multiple gradient cues. Moreover, it is unclear how neural responses to combinations of surface orientation cues are related to responses to the individual cues. We measured responses of middle temporal (MT) neurons to random dot stimuli that simulated planar surfaces at a variety of tilts and slants. Four cue conditions were tested: disparity, velocity, and texture gradients alone, as well as all three gradient cues combined. Many neurons showed robust tuning for surface tilt based on disparity and velocity gradients, with relatively little selectivity for texture gradients. Some neurons showed consistent tilt preferences for disparity and velocity cues, whereas others showed large discrepancies. Responses to the combined stimulus were generally well described as a weighted linear sum of responses to the individual cues, even when disparity and velocity preferences were discrepant. These findings suggest that area MT contains a rudimentary representation of 3-D surface orientation based on multiple cues, with single neurons implementing a simple cue integration rule.
机译：平面贴片的三维（3-D）方向的神经编码可能是构造复杂3-D表面结构表示形式的重要中间步骤。双目视差，图像速度和纹理的空间梯度为平面的3D方向（倾斜和倾斜）提供了有效的提示。先前的研究已经描述了基于这些梯度提示中的一个或多个，在背侧和腹侧流区域中的神经元对表面倾斜具有选择性。但是，关于单个神经元是否从多个梯度线索提供有关表面方向的一致信息知之甚少。而且，还不清楚对表面取向线索的组合的神经反应与对单个线索的反应如何相关。我们测量了中颞（MT）神经元对随机点刺激的响应，该点模拟了各种倾斜和倾斜下的平面。测试了四个提示条件：单独的视差，速度和纹理渐变，以及所有三个渐变提示的组合。许多神经元显示出基于视差和速度梯度对表面倾斜的鲁棒调整，而对纹理梯度的选择性相对较小。一些神经元对视差和速度提示表现出一致的倾斜偏好，而其他神经元则表现出较大差异。对组合刺激的反应通常被很好地描述为对单个提示的反应的加权线性总和，即使在视差和速度偏好方面存在差异时也是如此。这些发现表明，区域MT包含基于多个线索的3-D表面方向的基本表示，其中单个神经元实现了简单的线索整合规则。

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