Radboud University, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, the Netherlands.
Biopsychology & Cognitive Neuroscience, Faculty of Psychology & Sports Science, Bielefeld University, Bielefeld, Germany; Center of Excellence in Cognitive Interaction Technology (CITEC), Bielefeld University, Bielefeld, Germany.
Prog Neurobiol. 2019 Dec;183:101691. doi: 10.1016/j.pneurobio.2019.101691. Epub 2019 Sep 6.
Posterior parietal cortex (PPC) has been implicated in sensory and motor processing, but its underlying organization is still debated. Sensory-based accounts suggest that PPC is mainly involved in attentional selection and multisensory integration, serving novelty detection and information seeking. Motor-specific accounts suggest a parietal subdivision into lower-dimensional, effector-specific subspaces for planning motor action. More recently, function-based interpretations have been put forward based on coordinated responses across multiple effectors evoked by circumscribed PPC regions. In this review, we posit that an overarching interpretation of PPC's functional organization must integrate, rather than contrast, these various accounts of PPC. We propose that PPC's main role is that of a state estimator that extends into two poles: a rostral, body-related pole that projects the environment onto the body and a caudal, environment-related pole that projects the body into an environment landscape. The combined topology interweaves perceptual, motor, and function-specific principles, and suggests that actions are specified by top-down guided optimization of body-environment interactions.
顶叶后皮质（PPC）已被牵涉到感觉和运动处理中，但它的基础组织仍存在争议。基于感觉的解释表明，PPC 主要参与注意力选择和多感觉整合，用于检测新奇事物和寻求信息。针对运动的解释则表明，PPC 被划分为低维的、针对特定效应器的子空间，用于规划运动行为。最近，基于受限定 PPC 区域引发的多个效应器的协调反应，提出了基于功能的解释。在这篇综述中，我们假设 PPC 功能组织的总体解释必须整合，而不是对比这些不同的 PPC 解释。我们提出，PPC 的主要作用是作为状态估计器，它延伸到两个极点：一个是与身体相关的额极，将环境投射到身体上，另一个是与环境相关的尾极，将身体投射到环境景观中。组合拓扑结构交织了知觉、运动和功能特定的原则，并表明动作是通过自上而下的引导优化身体-环境相互作用来指定的。
