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相关概念视频

The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
Vision01:24

Vision

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.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Visual System01:26

Visual System

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...
Color Vision01:24

Color Vision

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.

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相关实验视频

Updated: Jul 1, 2026

Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo
11:42

Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo

Published on: June 19, 2016

特定的视网膜神经元调节了对视觉威胁的上下文依赖的防御反应.

Tracy Lee1, Hannah Weinberg-Wolf1, Thomas E Zapadka2

  • 1Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT 06511, USA.

PNAS nexus
|October 3, 2024
PubMed
概括

截然不同的视网膜质细胞 (RGC) 类型控制动物的特定防御行为,如逃跑或结,基于环境背景. 这突显了早期视觉系统在威胁响应中的作用.

关键词:
防御性反应 防御性反应环境环境背景环境背景环境背景视网膜质细胞是视网膜质细胞.这是一个避难所.视觉威胁是一种视觉威胁.

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Published on: June 19, 2016

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

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科学领域:

  • 神经科学是一个神经科学.
  • 视觉科学 视觉科学 视觉科学
  • 动物行为 动物行为

背景情况:

  • 当面对像空中掠食者这样的视觉威胁时,动物表现出取决于环境的防御策略,例如逃跑或结.
  • 环境因素,如庇护所的可用性,显著影响动物的这些行为选择.
  • 视觉系统的早期阶段对于处理威胁信息和启动行为反应至关重要.

研究的目的:

  • 调查不同类型的视网膜质细胞 (RGCs) 是否启动上下文依赖的防御行为.
  • 为了确定特定的RGC亚型是否负责对迫在眉的刺激产生逃脱或结反应.
  • 了解早期视觉通路在调解进化保护威胁反应中的作用.

主要方法:

  • 在成熟小鼠中利用基因定义的细胞剥离来选择性地去除特定的RGC类型.
  • 在不同的环境环境下观察和分析行为反应 (逃避与结) 迫在眉的视觉刺激在不同的环境背景下 (庇护所存在与缺席).
  • 对比了不同RGC类型 (αRGC,内在光敏RGC,方向选择性RGC) 对于特定行为的必要性.

主要成果:

  • 发现阿尔法RGCs是必要的,以逃避行为,以应对迫在眉的刺激.
  • 本质上光敏感的RGC被确定为结行为所必需的.
  • 对于这两种行为,既不需要αRGCs,也不需要内在光敏的RGCs,对于任何一种反应,方向选择性RGCs都不必.

结论:

  • 视网膜中的特定RGC类型对相同的视觉威胁有不同的行为反应进行不同的调节.
  • 语境环境信号调节特定RGC的活动,以引起适当的防御行动.
  • 这些发现强调了专门的早期视觉处理在调解保存动物行为的关键作用.