Texture segregation in the human visual cortex: A functional MRI study
Texture segregation in the human visual cortex: A functional MRI study
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DOI：
10.1152/jn.2000.83.4.2453
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发表时间：
2000-04-01
影响因子：
2.5
通讯作者：
Ungerleider, LG
中科院分区：
文献类型：
--
作者：
Kastner, S;De Weerd, P;Ungerleider, LG
人眼视皮层的纹理分离：一项功能性核磁共振研究。J.神经生理素。83：2453-2457,2000。基于轮廓信息的视觉场景分离是早期视觉的一个基本过程。轮廓可以由简单的提示(如亮度)定义，也可以由更复杂的提示(如纹理)定义。猴子的单细胞记录研究表明，复杂轮廓的神经处理早在初级视觉皮质就开始了。此外，对猴子的损伤研究表明，高阶区对这些过程有重要贡献。利用功能磁共振成像，我们研究了人类视觉皮质中与纹理分离相关的神经水平。在五名健康受试者中，比较了有和没有纹理定义边界的线条纹理引起的活动。与空白呈现相比，两种线条纹理都激活了V1、V2/VP、V4、TEO和V3A区。与均匀纹理相比，边界形成棋盘图案的纹理在V4、Teo区引起的活动明显更多，在V3A区的可靠性较低，但在V1或V2/VP区不引起明显的活动。这些结果表明，具有较大感受野的高阶区域在基于纹理定义的边界的视觉场景的分离中起着重要作用。
Texture segregation in the human visual cortex: a functional MRI study. J. Neurophysiol. 83: 2453-2457, 2000. The segregation of visual scenes based on contour information is a fundamental process of early vision. Contours can be defined by simple cues, such as luminance, as well as by more complex cues, such as texture. Single-cell recording studies in monkeys suggest that the neural processing of complex contours starts as early as primary visual cortex. Additionally, lesion studies in monkeys indicate an important contribution of higher order areas to these processes. Using functional MRI, we have investigated the level at which neural correlates of texture segregation can be found in the human visual cortex. Activity evoked by line textures, with and without texture-defined boundaries, was compared in five healthy subjects. Areas V1, V2/VP, V4, TEO, and V3A were activated by both kinds of line textures as compared with blank presentations. Textures with boundaries forming a checkerboard pattern, relative to uniform textures, evoked significantly more activity in areas V4, TEO, less reliably in V3A, but not in V1 or V2/VP. These results provide evidence that higher order areas with large receptive fields play an important role in the segregation of visual scenes based on texture-defined boundaries.