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関連する概念動画

Vision01:24

Vision

56.9K
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.
56.9K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

7.8K
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...
7.8K
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

605
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
605
Visual System01:26

Visual System

1.1K
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...
1.1K

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関連する実験動画

Updated: Oct 22, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

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将来の光学的流れをシミュレートすることによって,網膜波の主要な視覚的運動検出

Xinxin Ge1, Kathy Zhang1, Alexandra Gribizis1

  • 1Department of Neuroscience, Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA.

Science (New York, N.Y.)
|August 26, 2021
PubMed
まとめ
この要約は機械生成です。

眼が開く前に ネズミの自発的な網膜波が 光の流れを模倣し 視覚回路の発達を誘導します この波の方向性を妨害すると ニューロンが視覚的動きを処理し 早期の活動が視覚的反応を どう形作るかを明らかにします

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Video-oculography in Mice
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Using Looming Visual Stimuli to Evaluate Mouse Vision
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関連する実験動画

Last Updated: Oct 22, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

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Video-oculography in Mice
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Using Looming Visual Stimuli to Evaluate Mouse Vision
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科学分野:

  • 神経科学
  • 発達生物学
  • 視覚システム開発

背景:

  • 環境への反応能力の出現には 感覚経験は必要ありません
  • 哺乳類では,自発的な網膜活動が,眼を開ける前に網膜形成と眼特異的分離を精製する.
  • この早期の網膜活動が,高次元の視覚反応の発達における役割は十分に理解されていません.

研究 の 目的:

  • 初期の視覚処理における 網膜の自発的な波の役割を調査する.
  • 網膜波の空間的伝播が 光学流動パターンに似ているかどうかを判断する.
  • これらの波の方向性が方向選択性ニューロンの発達にどのように影響するかを調べる.

主な方法:

  • 新生マウスモデルにおける自発的な網膜波の伝播パターンの分析.
  • 波の方向性を破壊する 遺伝的または薬学的操作
  • 応答特性を評価するために,上部コリキュルニューロンの電気生理学的記録.

主要な成果:

  • 網膜波が光学的な流れのように空間的に広がる特定の発達窓が特定されました.
  • 大人の方向選択性網膜回路に必要な回路構成要素は,波の方向性にも必要です.
  • 網膜波の方向性の慢性的な障害は,上部コリキュルスのニューロンの方向選択反応の変化をもたらした.

結論:

  • 視覚系の開発は 光の流れのような 現実の刺激をシミュレートする自発的な活動パターンを利用します
  • この自己生成活動は 視覚回路の自己組織化,特に運動処理を指示します
  • 早期の網膜波の方向性は,成熟した視覚応答の特性を確立するために不可欠です.