Reliability-dependent contributions of visual orientation cues in parietal cortex.
Reliability-dependent contributions of visual orientation cues in parietal cortex.
复制标题
顶叶皮层视觉定向线索的可靠性依赖性贡献。
DOI：
10.1073/pnas.1421131111
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发表时间：
2014
影响因子：
11.1
通讯作者：
Angelaki,DoraE
中科院分区：
文献类型：
--
作者：
Rosenberg,Ari;Angelaki,DoraE
从2D视网膜图像创建世界的精确3D表示是视觉系统的基本任务。然而，不同3D视觉信号的可靠性本质上取决于观看几何形状，例如物体在深度上倾斜的程度。人类的感知研究表明，纹理和双目视差线索的对象方向相结合，根据其倾斜依赖的可靠性。这种线索组合在大脑中的位置和方式目前尚不清楚。在这里，我们寻找神经相关的猕猴尾侧顶内区（CIP）通过测量倾斜调谐曲线，使用混合线索（纹理+视差）和线索隔离（纹理或视差）平面刺激。我们发现，纹理线索有助于更多的CIP神经元，更喜欢较大的倾斜，与理论和心理物理学的结果表明，纹理相对于视差线索的可靠性增加与倾斜角的混合线索的反应。通过分析反应双目观看纹理刺激与冲突的纹理和视差信息，一些细胞，这是敏感的两个线索时，孤立地被发现忽视的线索冲突期间的线索之一。此外，纹理和混合线索反应之间的相似性被发现是更大的，当这种线索冲突被消除，通过提出纹理刺激单眼。目前的研究结果表明，可靠性依赖的贡献的视觉方向线索的水平的CIP，从而揭示了神经相关的人类视觉感知的这一属性。
Creating accurate 3D representations of the world from 2D retinal images is a fundamental task for the visual system. However, the reliability of different 3D visual signals depends inherently on viewing geometry, such as how much an object is slanted in depth. Human perceptual studies have correspondingly shown that texture and binocular disparity cues for object orientation are combined according to their slant-dependent reliabilities. Where and how this cue combination occurs in the brain is currently unknown. Here, we search for neural correlates of this property in the macaque caudal intraparietal area (CIP) by measuring slant tuning curves using mixed-cue (texture + disparity) and cue-isolated (texture or disparity) planar stimuli. We find that texture cues contribute more to the mixed-cue responses of CIP neurons that prefer larger slants, consistent with theoretical and psychophysical results showing that the reliability of texture relative to disparity cues increases with slant angle. By analyzing responses to binocularly viewed texture stimuli with conflicting texture and disparity information, some cells that are sensitive to both cues when presented in isolation are found to disregard one of the cues during cue conflict. Additionally, the similarity between texture and mixed-cue responses is found to be greater when this cue conflict is eliminated by presenting the texture stimuli monocularly. The present findings demonstrate reliability-dependent contributions of visual orientation cues at the level of the CIP, thus revealing a neural correlate of this property of human visual perception.