Attention to form or surface properties modulates different regions of human occipitotemporal cortex
Attention to form or surface properties modulates different regions of human occipitotemporal cortex
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DOI：
10.1093/cercor/bhk022
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发表时间：
2007-03-01
期刊：
影响因子：
3.7
通讯作者：
Goodale, Melvyn A.
中科院分区：
文献类型：
--
作者：
Cant, Jonathan S.;Goodale, Melvyn A.
我们进行了2个功能性磁共振成像实验，以研究形状和表面特性对物体识别的作用机制。在实验1中，参与者根据不熟悉的“无意义”物体的形状、表面特性（即颜色和纹理）或方向，在不同的试验块中对它们进行相同的判断。对形态的关注激活了枕外侧（LO）区域，而对表面特性的关注激活了侧侧沟（CoS）和枕下回（IOG）。在实验2中，参与者被要求根据纹理、颜色或形状做出相同的判断。再次注意形成激活区域LO，而注意纹理激活区域在IOG和CoS，以及舌沟和颞下沟。在最后4个区域中，与纹理相关的激活高于与颜色相关的激活。在这些区域没有识别出特定颜色的皮质区域，尽管V1和楔叶的部分区域对颜色的激活比纹理的激活更高。这些结果表明，在纹状体外皮层中存在着独立的形式和表面性质通路。与表面纹理的提取相比，物体颜色信息的提取似乎在视觉分析中出现得相对较早，这可能是因为后者需要更复杂的计算。
We carried out 2 functional magnetic resonance imaging experiments to investigate the cortical mechanisms underlying the contribution of form and surface properties to object recognition. In experiment 1, participants performed same-different judgments in separate blocks of trials on pairs of unfamiliar "nonsense" objects on the basis of their form, surface properties (i.e., both color and texture), or orientation. Attention to form activated the lateral occipital (LO) area, whereas attention to surface properties activated the collateral sulcus (CoS) and the inferior occipital gyrus (IOG). In experiment 2, participants were required to make same-different judgments on the basis of texture, color, or form. Again attention to form activated area LO, whereas attention to texture activated regions in the IOG and the CoS, as well as regions in the lingual sulcus and the inferior temporal sulcus. Within these last 4 regions, activation associated with texture was higher than activation associated with color. No color-specific cortical areas were identified in these regions, although parts of V1 and the cuneus yielded higher activation for color as opposed to texture. These results suggest that there are separate form and surface-property pathways in extrastriate cortex. The extraction of information about an object's color seems to occur relatively early in visual analysis as compared with the extraction of surface texture, perhaps because the latter requires more complex computations.