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The optimal arousal theory suggests that performance is maximized when an individual experiences a moderate level of arousal. This theory is closely tied to the Yerkes-Dodson law, which illustrates an inverted U-shaped relationship between arousal and performance. The law, formulated by psychologists Robert Yerkes and John Dodson, implies an ideal arousal level for optimal performance, and deviations from this level can lead to declines in effectiveness.
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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High-resolution Structural Magnetic Resonance Imaging of the Human Subcortex In Vivo and Postmortem
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高分辨率的死后MRI发现人类上升兴奋网络中的结构连接正在发展.

Roxane Licandro1,2, Mark Olchanyi3,4, Luiz F Ferraz da Silva5

  • 1Laboratories for Computational Neuroimaging, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, USA.

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概括

上升性兴奋网络 (AAN) 显示了从胎儿到成年人的结构性连接的发展. 关键的枢纽,如背部拉菲细胞核和腹部 tegmental 区域被早期识别,有助于理解兴奋障碍.

关键词:
上升的兴奋网络上升的兴奋网络发展结构性的连接性.开发了通道图形学.胎儿和婴儿成像技术基于图形的分析分析.尸体后脑部成像 尸体后脑部成像

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科学领域:

  • 神经科学是一个神经科学.
  • 发展生物学 发展生物学
  • 神经成像是一种神经成像.

背景情况:

  • 人类的兴奋对生存至关重要,由上升兴奋网络 (AAN) 调解.
  • AAN的发展轨迹,特别是在生命早期,仍然在很大程度上未被利用高分辨率技术绘制出来.
  • 了解AAN的发展对于了解兴奋障碍至关重要.

研究的目的:

  • 在整个发育过程中绘制人类上升唤醒网络 (AAN) 的结构连接.
  • 研究从胎儿到成年阶段的AAN中心的出现和演变.
  • 为了解发育性兴奋障碍提供高分辨率的神经解剖学的基础.

主要方法:

  • 活体扩散MRI被用于对七个胎儿,婴儿和成人人类大脑进行高分辨率分析.
  • 概率学曲谱法被用来重建神经通路.
  • 图形理论被用来量化和分析网络连接.

主要成果:

  • 在AAN的结构连接中,在第一个概念后的一年中,呈现出渐进的整合和面向扩张.
  • 背脊 (DR) 核和腹膜区域 (VTA) 被确定为从胎儿阶段到成年时存在的重要AAN连接枢纽.
  • 东部交通运输局作为一个具有短距离连接的本地枢纽,而VTA则发展成为一个具有远距离连接的全球枢纽.

结论:

  • 该研究提供了人类AAN发展的新,高分辨率的地图.
  • 早期识别DR和VTA作为关键枢纽,突出了它们在整个生命中的重要性.
  • 这些发现提高了对规范性大脑发育的理解,并提供了对SIDS和昏迷等疾病的见解.