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相关概念视频

Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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相关实验视频

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白质网络是语义处理的基础:来自中风患者的证据.

Xiangyue Xiao1,2, Zhicai Dong1,2, Mingyan Yu1,2

  • 1School of Basic Medical Sciences, Hangzhou Normal University, Hangzhou 311121, China.

Brain communications
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概括

这项研究确定了左状回形作为中风患者的关键语义枢纽,表明其连接对于一般语义处理和特定对象知识至关重要.

关键词:
模式特定的连接方式.语义中心的语义中心.语义处理 语义处理一次性中风中风中风中风中风白质网络是一个白质网络.

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科学领域:

  • 神经科学是一个神经科学.
  • 认知心理学 认知心理学
  • 神经学 神经学

背景情况:

  • 枢纽和子理论认为,语义知识依赖于模式特定的区域和一个中央语义枢纽.
  • 以前的研究表明,左状回旋是语义枢纽,但语义痴呆症患者的损伤掩盖了结构损伤或脱节是否导致缺陷.
  • 没有左状带损伤但有语义缺陷的中风患者提供了一个独特的模型来验证枢纽的网络作用.

研究的目的:

  • 从中风患者的网络视角来验证左侧状作为语义枢纽.
  • 探索白质连接对于语义枢纽的功能至关重要.
  • 调查语义枢纽的连接如何支持一般和模式特定的语义处理.

主要方法:

  • 收集了79名中风患者的扩散权重成像和行为数据,他们执行了一般和模式特定的语义任务.
  • 利用相关性和回归分析将全脑结构网络连接 (节点程度) 与语义性能联系起来.
  • 与左状回形连接的区域的相关白质完整性与语义任务执行,控制混变量.

主要成果:

  • 左状环的连接性显著预测了一般的语义性能,证实了其作为语义枢纽的作用.
  • 枢纽区域通过与左上极,中环,下环和海马体的连接处理一般语义.
  • 特定的白质连接到枢纽不同支持对象的形式,颜色,运动,声音,操纵和功能的处理.

结论:

  • 左侧状回形作为人类大脑中关键的语义枢纽,如中风患者的网络连接所证明.
  • 这项研究揭示了特定的白质路径,通过这些路径,语义中心与其他大脑区域相互作用,以支持语义记忆.
  • 这些发现为语义记忆的组织和语义缺陷的网络基础提供了新的神经解剖学见解.