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相关概念视频

Vision01:24

Vision

53.6K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
53.6K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

7.2K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
7.2K
Visual System01:26

Visual System

627
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
627
Color Vision01:24

Color Vision

619
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
619
Parallel Processing01:20

Parallel Processing

186
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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相关实验视频

Updated: Jul 27, 2025

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance

Published on: May 7, 2014

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多光谱网络的功能组织中的发展差异.

Nathan M Petro1,2, Giorgia Picci1,2,3, Christine M Embury1,2

  • 1Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE, United States.

Cerebral cortex (New York, N.Y. : 1991)
|June 6, 2023
PubMed
概括

青少年 (9-15岁) 的大脑连接随着年龄的增长而变得更加分离,特别是在三角波和α频段,通过磁脑电图 (MEG) 测量. 这种发育转变会影响边缘和认知网络.

关键词:
青春期 青春期 青春期连接性的连接性.磁脑脑摄影 (MEG) 是一种磁脑脑摄影技术.振荡的振荡是如何发生的休息状态的休息状态.这是自发的,自发的.

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Revealing Neural Circuit Topography in Multi-Color
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Revealing Neural Circuit Topography in Multi-Color

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Modeling the Functional Network for Spatial Navigation in the Human Brain
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Modeling the Functional Network for Spatial Navigation in the Human Brain

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相关实验视频

Last Updated: Jul 27, 2025

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
09:01

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance

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10.2K
Revealing Neural Circuit Topography in Multi-Color
09:11

Revealing Neural Circuit Topography in Multi-Color

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Modeling the Functional Network for Spatial Navigation in the Human Brain
05:55

Modeling the Functional Network for Spatial Navigation in the Human Brain

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科学领域:

  • 神经科学是一个神经科学.
  • 发育神经科学的发展神经科学.
  • 脑部成像 脑部成像

背景情况:

  • 休息状态大脑连接性评估对于理解功能性大脑组织的发育变化至关重要.
  • 以前的研究,主要是使用fMRI,表明在开发过程中从本地处理转向分布式处理.
  • 在这种情况下,使用磁大脑摄影 (MEG) 的多谱功能连接仍然不那么明显.

研究的目的:

  • 在典型发育的年轻人中使用MEG在休息期间研究多谱功能连接的发育变化.
  • 在不同频段的脑网络组织中与年龄相关的改变的特征.

主要方法:

  • 在101名典型发育的青少年 (9-15岁) 中,在闭眼休息期间检查了自发皮质活动,使用MEG.
  • 计算的多光谱MEG图像和估计的功能连接使用200个大脑区域之间的相连贯的虚构部分 (Schaefer皮质地图).
  • 分析了三角波,三角波,α,β和马频段的连接性.

主要成果:

  • 德尔塔和阿尔法连接矩阵显示,随着年龄的增长,社区结构的增加.
  • 连接权重通常随着年龄的增长而降低,在三角波段和α波段.
  • 带差异与边缘皮层区域有关;α带差异涉及注意力和认知网络.

结论:

  • 大脑的功能组织在青春期的发育过程中变得更加分离,这与之前的研究一致.
  • 大脑连接的发育变化在正规大脑网络中表现出光谱特异性.
  • 基于MEG的多谱分析为大脑组织中的神经发育变化提供了宝贵的见解.