下纵束和中纵束以及穹窿支持以客体为中心的表征。

Inferior and Middle Longitudinal Fasciculus and Fornix Support Allocentric Representation.

作者信息

Evensmoen Hallvard Røe, Rimol Lars M, Håberg Asta

机构信息

Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.

MiDT National Research Center, Center for Innovation, Medical Equipment and Technology, St. Olav's Hospital, Trondheim University Hospital, Trondheim, Norway.

出版信息

Hippocampus. 2025 Sep;35(5):e70031. doi: 10.1002/hipo.70031.

Abstract

If a map-like representation in the brain originates within a distributed network of brain regions, then this network should be underpinned by white-matter pathways. To test this, we had 83 young adults learn 15 virtual environments through free exploration, followed by tests of their allocentric and non-allocentric representation of these environments. Diffusion magnetic resonance imaging (dMRI) - based tractography was used to extract the main white matter tracts in the brain, including the inferior and middle longitudinal fasciculus, the main connections between the temporal lobe and the visual cortices, as well as the fornix, the main output pathway from the hippocampus to the cortex. Higher microstructural integrity in the inferior and middle longitudinal fasciculus and fornix, as indexed by higher FA, was associated with a more accurate scale, rotation, and translation-invariant allocentric representation of the objects' positional pattern. These findings show that properties of white matter fiber pathways that link visual cortices to the temporal lobe and the temporal lobe to other parts of the brain underpin a person's ability to form successful map-like representations.

摘要

如果大脑中类似地图的表征源自大脑区域的分布式网络,那么这个网络应该由白质通路作为支撑。为了验证这一点,我们让83名年轻人通过自由探索学习15个虚拟环境,随后测试他们对这些环境的以自我为中心和非自我为中心的表征。基于扩散磁共振成像(dMRI)的纤维束成像技术被用于提取大脑中的主要白质束,包括下纵束和中纵束,这是颞叶与视觉皮层之间的主要连接,还有穹窿,它是海马体通向皮层的主要输出通路。由更高的分数各向异性(FA)所表明的下纵束和中纵束以及穹窿中更高的微观结构完整性,与物体位置模式更精确的比例、旋转和平移不变的以自我为中心的表征相关。这些发现表明,将视觉皮层与颞叶以及颞叶与大脑其他部分相连的白质纤维通路的特性,支撑着一个人形成成功的类似地图表征的能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2af2/12329484/d9ff20800d94/HIPO-35-0-g001.jpg

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