Applied Cognitive Neuroscience Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong, China.
Department of Psychology, Bahir Dar University, Bahir Dar, Ethiopia.
Eur J Neurosci. 2021 Jun;53(11):3672-3687. doi: 10.1111/ejn.15240. Epub 2021 May 10.
The uniqueness of neural processes between allocentric and egocentric spatial coding has been controversial. The distinctive paradigms used in previous studies for manipulating spatial coding could have attributed for the inconsistent results. This study was aimed to generate converging evidence from previous functional brain imaging experiments for collating neural substrates associated with these two types of spatial coding. An additional aim was to test whether test-taking processes would have influenced the results. We obtained coordinate-based functional neuroimaging data for 447 subjects and performed activation likelihood estimation (ALE) meta-analysis. Among the 28 experiments, the results indicate two common clusters of convergence. They were the right precuneus and the right superior frontal gyrus as parts of the parieto-frontal circuit. Between-type differences were in the parieto-occipital circuit, with allocentric showing convergence in the superior occipital gyrus (SOG) cluster compared with egocentric showing convergence in the middle occipital gyrus (MOG) cluster. Task-specific influences were only found in allocentric spatial coding. Spatial judgment-oriented tasks seem to increase the demands on manipulating spatial relationships among the visual objects, while spatial navigation tasks seem to increase the demands on maintaining object representations. Our findings address the theoretical controversies on spatial coding that both the allocentric and egocentric types are common in their processes mediated by the parieto-frontal network, while unique and additional processes in the allocentric type are mediated by the parieto-occipital network. The positive results on possible task-specific confound offer insights into the future design of spatial tasks for eliciting spatial coding processes.
神经过程在定位和自我中心空间编码之间的独特性一直存在争议。以前研究中用于操纵空间编码的独特范式可能导致了不一致的结果。本研究旨在从以前的功能脑成像实验中生成趋同证据，以整理与这两种类型的空间编码相关的神经基质。另一个目的是测试测试过程是否会影响结果。我们获得了 447 名受试者的基于坐标的功能神经影像学数据，并进行了激活似然估计（ALE）荟萃分析。在 28 项实验中，结果表明有两个共同的汇聚簇。它们是右顶下小叶和右额上回，作为顶-额回路的一部分。在类型之间的差异在顶-枕回路中，与自我中心相比，定位空间编码显示在顶枕回（SOG）簇中的汇聚，而自我中心显示在中枕回（MOG）簇中的汇聚。仅在定位空间编码中发现了任务特定的影响。空间判断导向任务似乎增加了对操纵视觉对象之间空间关系的需求，而空间导航任务似乎增加了对保持对象表示的需求。我们的发现解决了空间编码的理论争议，即定位和自我中心两种类型都通过顶-额网络介导，而定位类型的独特和额外过程通过顶-枕网络介导。关于可能的任务特定混杂的阳性结果为未来设计用于引发空间编码过程的空间任务提供了见解。
