Proaction Laboratory, Faculty of Psychology and Educational Sciences, University of Coimbra, Portugal; CINEICC, Faculty of Psychology and Educational Sciences, University of Coimbra, Portugal.
Proaction Laboratory, Faculty of Psychology and Educational Sciences, University of Coimbra, Portugal; CINEICC, Faculty of Psychology and Educational Sciences, University of Coimbra, Portugal.
Cortex. 2021 Jul;140:1-13. doi: 10.1016/j.cortex.2021.03.011. Epub 2021 Mar 26.
The processes and organizational principles of information involved in object recognition have been a subject of intense debate. These research efforts led to the understanding that local computations and feedforward/feedback connections are essential to our representations and their organization. Recent data, however, has demonstrated that distal computations also play a role in how information is locally processed. Here we focus on how long-range connectivity and local functional organization of information are related, by exploring regions that show overlapping category-preferences for two categories and testing whether their connections are related with distal representations in a category-specific way. We used an approach that relates functional connectivity with distal areas to local voxel-wise category-preferences. Specifically, we focused on two areas that show an overlap in category-preferences for tools and hands-the inferior parietal lobule/anterior intraparietal sulcus (IPL/aIPS) and the posterior middle temporal gyrus/lateral occipital temporal cortex (pMTG/LOTC) - and how connectivity from these two areas relate to voxel-wise category-preferences in two ventral temporal regions dedicated to the processing of tools and hands separately-the left medial fusiform gyrus and the fusiform body area respectively-as well as across the brain. We show that the functional connections of the two overlap areas correlate with categorical preferences for each category independently. These results show that regions that process both tools and hands maintain object topography in a category-specific way. This potentially allows for a category-specific flow of information that is pertinent to computing object representations.
对象识别中所涉及的信息的处理过程和组织原则一直是激烈争论的主题。这些研究工作使人们认识到，局部计算和前馈/反馈连接对于我们的表示及其组织是必不可少的。然而，最近的数据表明，远距离计算也在信息的局部处理中发挥作用。在这里，我们通过探索表现出两种类别重叠类别的区域，研究长程连接和信息的局部功能组织之间的关系，并测试它们的连接是否以特定于类别的方式与远距离表示相关，来关注远距离连接和信息的局部功能组织之间的关系。我们使用了一种将功能连接与远距离区域相关联的方法来研究局部体素的类别偏好。具体来说，我们关注两个区域，它们在工具和手的类别偏好上有重叠——下顶叶/前内顶叶沟（IPL/aIPS）和后颞中回/外侧枕颞叶皮层（pMTG/LOTC）——以及这两个区域的连接与分别专门处理工具和手的两个腹侧颞叶区域（左侧内侧梭状回和梭状回体区）以及整个大脑的体素类别偏好之间的关系。我们表明，两个重叠区域的功能连接与每个类别的类别偏好独立相关。这些结果表明，处理工具和手的区域以特定于类别的方式保持对象拓扑结构。这可能允许与计算对象表示相关的特定于类别的信息流。
