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相关概念视频

Olfaction01:25

Olfaction

47.8K
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
1.3K

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相关实验视频

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Visualization of Cortical Modules in Flattened Mammalian Cortices
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Visualization of Cortical Modules in Flattened Mammalian Cortices

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内皮层空间地图的微观结构.

Torkel Hafting1, Marianne Fyhn, Sturla Molden

  • 1Centre for the Biology of Memory, Norwegian University of Science and Technology, 7489 Trondheim, Norway.

Nature
|June 21, 2005
PubMed
概括

研究人员在大脑中发现了一个神经地图.

科学领域:

  • 神经科学是一个神经科学.
  • 认知科学 认知科学
  • 空间导航 空间导航

背景情况:

  • 空间导航依赖于神经算法整合位置,距离和方向.
  • 这些算法在皮质微电路中的精确实现尚不清楚.

研究的目的:

  • 为了研究大脑空间映射的神经基础.
  • 识别大脑皮层中的功能单位和空间表示的组织.

主要方法:

  • 电生理学记录在动物的后后中介性肠内皮层 (dMEC).
  • 分析神经活动与动物在环境中的位置有关.

主要成果:

  • 在dMEC中识别出"网格细胞",形成一个地形组织的神经图.
  • 证明网格细胞表现出与三角网格相对应的规律发射模式.
  • 观察到网格细胞间距和场面大小在dMEC的背向腹轴上有系统的变化.

结论:

  • 在dMEC中的网格细胞构成了大脑空间图的基本组成部分.
  • 这张地图基于路径集成,可以利用外部地标,但也可以独立运行.
  • 这些发现提供了对空间认知和记忆背后的神经机制的见解.

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