Rectilinear Edge Selectivity Is Insufficient to Explain the Category Selectivity of the Parahippocampal Place Area.
Rectilinear Edge Selectivity Is Insufficient to Explain the Category Selectivity of the Parahippocampal Place Area.
复制标题
直线边缘的选择性不足以解释帕拉希帕省位置区域的类别选择性。
DOI：
10.3389/fnhum.2016.00137
复制
发表时间：
2016
影响因子：
2.9
通讯作者：
Epstein RA
中科院分区：
文献类型：
--
作者：
Bryan PB;Julian JB;Epstein RA
海马旁位置区（parahippocampal place area，PPA）是对场景的反应比对非场景项目（如物体和面孔）更强烈的几个大脑区域之一。这种场景偏好反应背后的机制尚不清楚。一种可能性是PPA被调谐到低水平的刺激特征，这些特征在场景中比在不太优选的刺激中更常见。Nasr等人最近观察到，一些已知强烈激活PPA的刺激包含大量的直线边缘，这支持了这一观点。他们进一步证明了PPA响应是由一系列非场景图像的直线性调制的。受这些结果的启发，我们测试了直线性是否足以解释PPA场景的选择性。在第一个实验中，我们复制了以前发现的调制直线性的PPA阵列的2-D形状。然而，两个进一步的实验未能发现面部或场景的直线性效应：高直线性的面部和场景并没有比低直线性的面部和场景更强烈地激活PPA。此外，当刺激集之间的直线性匹配时，PPA和其他两个场景选择性区域-压后复合体（RSC）和枕叶位置区域（OPA）中的场景与面孔的分类优势得以保持。我们的结论是，在PPA的场景的选择性不能解释为低级别的直线边缘的偏好。
The parahippocampal place area (PPA) is one of several brain regions that respond more strongly to scenes than to non-scene items such as objects and faces. The mechanism underlying this scene-preferential response remains unclear. One possibility is that the PPA is tuned to low-level stimulus features that are found more often in scenes than in less-preferred stimuli. Supporting this view, Nasr et al. recently observed that some of the stimuli that are known to strongly activate the PPA contain a large number of rectilinear edges. They further demonstrated that PPA response is modulated by rectilinearity for a range of non-scene images. Motivated by these results, we tested whether rectilinearity suffices to explain PPA selectivity for scenes. In the first experiment, we replicated the previous finding of modulation by rectilinearity in the PPA for arrays of 2-d shapes. However, two further experiments failed to find a rectilinearity effect for faces or scenes: high-rectilinearity faces and scenes did not activate the PPA any more strongly than low-rectilinearity faces and scenes. Moreover, the categorical advantage for scenes vs. faces was maintained in the PPA and two other scene-selective regions—the retrosplenial complex (RSC) and occipital place area (OPA)—when rectilinearity was matched between stimulus sets. We conclude that selectivity for scenes in the PPA cannot be explained by a preference for low-level rectilinear edges.