Scratching Beneath the Surface: New Insights into the Functional Properties of the Lateral Occipital Area and Parahippocampal Place Area
Scratching Beneath the Surface: New Insights into the Functional Properties of the Lateral Occipital Area and Parahippocampal Place Area
复制标题
DOI：
10.1523/jneurosci.6113-10.2011
复制
发表时间：
2011-06-01
影响因子：
5.3
通讯作者：
Goodale, Melvyn A.
中科院分区：
文献类型：
--
作者：
Cant, Jonathan S.;Goodale, Melvyn A.
我们使用功能性磁共振成像对神经系统完好的人类进行研究，以研究视觉表面信号的不同类型的信息（纹理的形状与纹理的材料属性）是否有不同的神经基质。参与者参加了一组圆形表面的形状（平/凸），纹理和颜色（木材/岩石）或材料特性（软/硬）的差异。注意形状激活了轮廓敏感的枕叶外侧（LO）区，注意纹理激活了与海马旁区（PPA）重叠的侧沟（CoS）区。有趣的是，关注材料特性激活了CoS中相同的纹理敏感区域。这些结果表明，存在不同的神经基板的不同类型的信息，视觉表面信号。关于物体形状，LO区域的组织可能是复杂的，神经元不仅调整到物体的轮廓形状，而且调整到与轮廓无关的表面曲率。此外，据我们所知，这是第一个研究表明，处理表面纹理，这发生在场景敏感的PPA，是一条路线，以访问有关对象的材料属性的知识。考虑到这一点，我们建议视觉皮层组织模型不仅应该关注区域最大响应的特定刺激类别（例如，对象、场景），而且取决于最好地支持该类别的处理的刺激属性（例如，形状、纹理、材料特性）。
We used fMRI on neurologically intact humans to investigate whether or not there are different neural substrates for the different kinds of information that a visual surface signals (shape from texture vs material properties from texture). Participants attended to differences in the shape (flat/convex), texture and color (wood/rock), or material properties (soft/hard) of a set of circular surfaces. Attending to shape activated the contour-sensitive lateral occipital (LO) area, and attending to texture activated a region of the collateral sulcus (CoS) that overlaps with the parahippocampal place area (PPA). Interestingly, attending to material properties activated the same texture-sensitive region in the CoS. These results demonstrate the existence of different neural substrates for the different types of information that a visual surface signals. With regard to object shape, the organization of the LO area may be complex, with neurons tuned not only to the outline shape of objects, but also to their surface curvature independent of contour. Moreover, to our knowledge, this is the first study to demonstrate that processing surface texture, which occurs within the scene-sensitive PPA, is a route to accessing knowledge about an object's material properties. With this in mind, we propose that models of visual cortical organization should focus not only on the particular stimulus category to which a region maximally responds (e.g., objects, scenes), but also on the stimulus attributes that best support the processing of that category (e.g., shape, texture, material properties).