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首页> 外文期刊>The European Journal of Neuroscience >Is territorial expansion a mechanism for crossmodal plasticity?
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Is territorial expansion a mechanism for crossmodal plasticity?

机译：领土扩展是跨型塑性的机制吗？

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Crossmodal plasticity is the phenomenon whereby, following sensory damage or deprivation, the lost sensory function of a brain region is replaced by one of the remaining senses. One of several proposed mechanisms for this phenomenon involves the expansion of a more active brain region at the expense of another whose sensory inputs have been damaged or lost. This territorial expansion hypothesis was examined in the present study. The cat ectosylvian visual area (AEV) borders the auditory field of the anterior ectosylvian sulcus (FAES), which becomes visually reorganized in the early deaf. If this crossmodal effect in the FAES is due to the expansion of the adjoining AEV into the territory of the FAES after hearing loss, then the reorganized FAES should exhibit connectional features characteristic of the AEV. However, tracer injections revealed significantly different patterns of cortical connectivity between the AEV and the early deaf FAES, and substantial cytoarchitectonic and behavioral distinctions occur as well. Therefore, the crossmodal reorganization of the FAES cannot be mechanistically attributed to the expansion of the adjoining cortical territory of the AEV and an overwhelming number of recent studies now support unmasking of existing connections as the operative mechanism underlying crossmodal plasticity.
机译：横戴型塑性是现象，在感觉损伤或剥夺之后，脑区域的丢失的感觉功能被剩余的遗传。这种现象的几种机制之一涉及扩展更活跃的大脑区域，以牺牲另一种感觉输入损坏或丢失。在本研究中检测了该地域扩展假设。 Cat Ectosylvian视觉区域（AEV）边界前肌肉（FAE）的听觉场，在早期聋人中在视觉上重新组织。如果FEES中的这种跨型效应是由于在听力损失之后将毗邻AEV的扩大到FAE的领土，则重组FAE应表现出AEV的关联特征。然而，示踪剂喷射揭示了AEV和早期聋人之间的皮质连通性的显着不同模式，并且也发生了大量的细胞建筑和行为区分。因此，该FEE的跨型重组不能机械化地归因于AEV的相邻皮质境内的扩展，并且最近的最近的研究数量现在支持揭示现有联系的揭示性能，作为跨大型跨导可塑性的操作机制。

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