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首页> 外文期刊>The European Journal of Neuroscience >Structural asymmetry of the insula is linked to the lateralization of gesture and language
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Structural asymmetry of the insula is linked to the lateralization of gesture and language

机译：岛状结构的不对称性与手势和语言的偏侧性有关

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摘要

The control of gesture is one of the most left-lateralized functions, and the insular cortex is one of the most left-biased structures in the human brain. Therefore, we investigated whether structural asymmetries of the insula are linked to the organization of functional activity during gesture planning. We reconstructed and parcellated the insular cortex of 27 participants. First, we tested 15 strongly left-handed individuals because of a higher incidence of atypical organization of functions such as gesture and language in such a population. The inter-hemispheric structural asymmetries were compared with the lateralization of activity for gesture in the supramarginal gyrus (the hotspot of signal increase regardless of the gesturing hand) and Broca's area (the hotspot of signal increase for language production). The more pronounced leftward structural asymmetries were accompanied by greater left-hemisphere dominance for both of the studied functions. Conversely, an atypical, bilateral or rightward functional shift of gesture and language was accompanied by an attenuated leftward asymmetry of the insula. These significant relationships were driven primarily by differences in surface area. Subsequently, by adding 12 right-handed individuals to these analyses we demonstrated that the observed significant associations are generalizable to the population. These results provide the first demonstration of the relationships between structural inter-hemispheric differences of the insula and the cerebral specialization for gesture. They also corroborate the link between insular asymmetries and language lateralization. As such, these outcomes are relevant to the common cerebral specialization for gesture and language.
机译：手势控制是最偏向左侧的功能之一，而岛状皮层是人脑中最偏向左侧的结构之一。因此，我们调查了手势计划过程中，岛状结构的不对称性是否与功能活动的组织有关。我们重建并分割了27名参与者的岛状皮层。首先，我们测试了15位强力左撇子个体，因为这类人群中诸如手势和语言等非典型功能组织的发生率更高。将半球间结构的不对称性与上弓状回（手势的信号增加热点）和Broca的区域（语言产生的信号增加热点）手势活动的横向化进行了比较。对于两个研究功能，更明显的向左结构不对称性伴随着更大的左半球优势。相反，手势和语言的非典型，双边或向右功能转移伴随着岛状的向左减弱的不对称性。这些重要的关系主要是由表面积差异驱动的。随后，通过将12位惯用右手的个体添加到这些分析中，我们证明了观察到的显着关联可推广到总体。这些结果首次证明了脑岛半球间结构差异与手势的大脑专长之间的关系。他们还证实了岛状不对称与语言偏侧化之间的联系。因此，这些结果与手势和语言的常见大脑专业化有关。

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