fMR-adaptation reveals separate processing regions for the perception of form and texture in the human ventral stream
fMR-adaptation reveals separate processing regions for the perception of form and texture in the human ventral stream
复制标题
DOI：
10.1007/s00221-008-1573-8
复制
发表时间：
2009-01-01
影响因子：
2
通讯作者：
Goodale, Melvyn A.
中科院分区：
文献类型：
--
作者：
Cant, Jonathan S.;Arnott, Stephen R.;Goodale, Melvyn A.
我们最近证明，关注物体的形状和关注其表面特性会激活解剖学上不同的枕颞皮层区域（Cant 和 Goodale，Cereb Cortex 17：713-731，2007）。具体来说，关注形状会激活枕外侧区（LO），而关注纹理会激活侧副沟（CoS）。尽管这些区域显示出对某一特定刺激维度（例如 CoS 中的纹理）的优先激活，但它们也显示出对其他非首选刺激维度（例如 CoS 中的形式）的激活。这就提出了一个问题，例如，与 CoS 中对形式的关注相关的激活是否代表了对象形式的实际处理，或者代表了当人们关注形式时发生的对象纹理的强制性处理。为了研究这一点，我们进行了一项功能磁共振适应实验，该实验使我们能够检查当参与者没有明确关注特定刺激维度时专门用于处理形式、纹理和颜色的区域的响应特性。参与者被动地观看只有一个维度变化的块和没有维度变化的块，同时将十字固定在显示器的中心。区域 LO 对形状变化最敏感，而 CoS 对纹理变化最敏感。与我们之前的研究一样，没有发现对颜色变化最敏感的区域，但与该研究的结果不同，沿着梭状回和 CoS 的腹侧流的内侧区域对颜色表现出一定的选择性。总而言之，这些结果复制了我们之前的研究结果，并为腹侧流中形状和表面特性（特别是纹理）存在单独的处理途径提供了额外的证据。
We recently demonstrated that attending to the form of objects and attending to their surface properties activated anatomically distinct regions of occipito-temporal cortex (Cant and Goodale, Cereb Cortex 17:713-731, 2007). Specifically, attending to form activated the lateral occipital area (LO), whereas attending to texture activated the collateral sulcus (CoS). Although these regions showed preferential activation to one particular stimulus dimension (e.g. texture in CoS), they also showed activation to other, non-preferred stimulus dimensions (e.g. form in CoS). This raises the question as to whether the activation associated with attention to form in CoS, for example, represents the actual processing of object form or instead represents the obligatory processing of object texture that occurred when people attended to form. To investigate this, we conducted an fMR-adaptation experiment which allowed us to examine the response properties of regions specialized for processing form, texture, and colour when participants were not explicitly attending to a particular stimulus dimension. Participants passively viewed blocks where only one dimension varied and blocks where no dimensions varied, while fixating a cross in the centre of the display. Area LO was most sensitive to variations in form, whereas the CoS was most sensitive to variations in texture. As in our previous study, no regions were found that were most sensitive to variations in colour, but unlike the results from that study, medial regions of the ventral stream along the fusiform gyrus and CoS showed some selectivity to colour. Taken together, these results replicate the findings from our previous study and provide additional evidence for the existence of separate processing pathways for form and surface properties (particularly texture) in the ventral stream.