On the geometry of somatosensory representations in the Cortex

IF 4.7 2区 医学 Q1 NEUROIMAGING
Noam Saadon-Grosman , Tsahi Asher , Yonatan Loewenstein
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引用次数: 0

Abstract

The processing of somatosensory information in the cortex is often described using body maps, where adjacent cortical regions correspond to adjacent body parts. Additionally, the somatosensory cortex follows a hierarchical structure, which extends from the primary somatosensory cortex (S1) to higher cortical regions. While previous studies have identified multiple body maps and various hierarchy relations, the large-scale organization of these maps and their interactions have been less explored. Using functional MRI with full-body light touch stimulation, we discovered that in S1, body and hierarchy maps are orthogonal, but this orthogonality does not extend to other regions. On a larger scale, both body representation and hierarchy exhibit a radial organization, with a few central extrema governing numerous cortical regions. Similar patterns of radial organization in the visual and auditory systems suggest that radial topography may be a general organizational feature across sensory systems.
论大脑皮层体感表征的几何结构。
躯体感觉信息在皮质中的处理通常用身体图来描述,相邻的皮质区域对应相邻的身体部位。此外,体感觉皮层遵循分层结构,从初级体感觉皮层(S1)延伸到更高的皮质区域。虽然以前的研究已经确定了多种身体图谱和各种层次关系,但对这些图谱的大规模组织及其相互作用的探索较少。使用全身光触摸刺激的功能MRI,我们发现在S1中,身体和层次图是正交的,但这种正交性并不扩展到其他区域。在更大的尺度上,身体表征和层次结构都表现为放射状组织,几个中心极端控制着许多皮层区域。在视觉和听觉系统中类似的放射状组织模式表明放射状地形可能是整个感觉系统的一般组织特征。
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来源期刊
NeuroImage
NeuroImage 医学-核医学
CiteScore
11.30
自引率
10.50%
发文量
809
审稿时长
63 days
期刊介绍: NeuroImage, a Journal of Brain Function provides a vehicle for communicating important advances in acquiring, analyzing, and modelling neuroimaging data and in applying these techniques to the study of structure-function and brain-behavior relationships. Though the emphasis is on the macroscopic level of human brain organization, meso-and microscopic neuroimaging across all species will be considered if informative for understanding the aforementioned relationships.
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