Separate Channels for Processing Form, Texture, and Color: Evidence from fMRI Adaptation and Visual Object Agnosia
Separate Channels for Processing Form, Texture, and Color: Evidence from fMRI Adaptation and Visual Object Agnosia
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DOI：
10.1093/cercor/bhp298
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发表时间：
2010-10-01
期刊：
影响因子：
3.7
通讯作者：
Milner, A. D.
中科院分区：
文献类型：
--
作者：
Cavina-Pratesi, C.;Kentridge, R. W.;Milner, A. D.
以往的神经成像研究表明，虽然物体的形状是在枕叶外侧皮质分析的，但物体的表面属性，如颜色和纹理，是在更内侧的区域处理的，靠近侧支沟(Cos)。本研究试图确定是否存在与表面属性有关的单个内侧区域，或者是否存在独立提取不同表面属性的多个病灶。我们使用了形状、质地或颜色不同的刺激，并在辨别任务和功能性MR适应范式中测试了健康参与者和2名物体不认知症患者。我们发现，在加工表面(纹理或颜色)和几何(形状)属性上，内侧和外侧枕颞叶皮质之间存在双重分离。在实验2中，我们发现内侧枕颞叶皮质有不同的颜色(在前Cos和舌回内)和质地(在后Cos内)。此外，我们发现，单独选择形状、纹理和颜色的区域与同时响应所有这些特征的区域(形状、纹理和颜色)非常不同。后两个区域似乎对应于与对复杂刺激的感知相关的区域，如面部和地点。
Previous neuroimaging research suggests that although object shape is analyzed in the lateral occipital cortex, surface properties of objects, such as color and texture, are dealt with in more medial areas, close to the collateral sulcus (CoS). The present study sought to determine whether there is a single medial region concerned with surface properties in general or whether instead there are multiple foci independently extracting different surface properties. We used stimuli varying in their shape, texture, or color, and tested healthy participants and 2 object-agnosic patients, in both a discrimination task and a functional MR adaptation paradigm. We found a double dissociation between medial and lateral occipitotemporal cortices in processing surface (texture or color) versus geometric (shape) properties, respectively. In Experiment 2, we found that the medial occipitotemporal cortex houses separate foci for color (within anterior CoS and lingual gyrus) and texture (caudally within posterior CoS). In addition, we found that areas selective for shape, texture, and color individually were quite distinct from those that respond to all of these features together (shape and texture and color). These latter areas appear to correspond to those associated with the perception of complex stimuli such as faces and places.