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相关概念视频

Olfaction01:25

Olfaction

44.3K
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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Diencephalon: Anatomical Regions01:30

Diencephalon: Anatomical Regions

1.8K
The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
1.8K
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...
222

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相关实验视频

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A Video Demonstration of Preserved Piloting by Scent Tracking but Impaired Dead Reckoning After Fimbria-Fornix Lesions in the Rat
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灵长类动物内腔皮层的心理导航

Sujaya Neupane1, Ila Fiete1,2, Mehrdad Jazayeri3,4

  • 1McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|June 12, 2024
PubMed
概括

子在没有外部线索的情况下使用内脑表现或认知地图进行心理导航. 这项研究揭示了脑内皮层如何内生地回忆地标,影响路径整合.

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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
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Utilizing a Reconfigurable Maze System to Enhance the Reproducibility of Spatial Navigation Tests in Rodents
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相关实验视频

Last Updated: Jun 24, 2025

A Video Demonstration of Preserved Piloting by Scent Tracking but Impaired Dead Reckoning After Fimbria-Fornix Lesions in the Rat
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A Video Demonstration of Preserved Piloting by Scent Tracking but Impaired Dead Reckoning After Fimbria-Fornix Lesions in the Rat

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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex

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Utilizing a Reconfigurable Maze System to Enhance the Reproducibility of Spatial Navigation Tests in Rodents
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科学领域:

  • 神经科学
  • 认知科学
  • 计算神经科学

背景情况:

  • 认知地图可以从过去的经验中进行新的计算,
  • 之前的研究表明,在空间和非空间领域具有外部感官输入的认知地图.
  • 这项研究调查了认知地图是否在没有外部输入的情况下内在运作.

研究的目的:

  • 测试认知地图是否支持无外部感官输入的内生计算.
  • 调查内源性认知地图招募中的内腔皮层的作用.
  • 探索大脑如何在心智导航过程中内存地标.

主要方法:

  • 记录了子脑内皮层中的神经活动,
  • 子使用操纵杆在视觉地标之间创建向量, 而不会看到中间点.
  • 使用连续吸引器网络模型与Hebbian学习来模拟内源地标回忆.

主要成果:

  • 子的任务表现和概括表明它们依赖于结构化的地标表示.
  • 任务调节的神经元显示周期性和升, 与连续的吸引网络一致.
  • 一个计算模型解释了内源地标回忆,并预测了路径集成的短暂减速.

结论:

  • 研究结果将脑内皮层活动模式与内源性认知图征集联系起来.
  • 这项研究提供了支持内部计算的认知地图的证据.
  • 这项研究阐明了内生地标回忆的机制及其对航行的影响.