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関連する概念動画

The Retina01:32

The Retina

56.7K
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.
56.7K
Vision01:24

Vision

48.6K
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.
48.6K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

8.6K
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...
8.6K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

8.5K
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,...
8.5K
Visual System01:26

Visual System

2.3K
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...
2.3K
Color Vision01:24

Color Vision

2.0K
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.
2.0K

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関連する実験動画

Updated: May 5, 2026

Live-imaging of the Drosophila Pupal Eye
09:54

Live-imaging of the Drosophila Pupal Eye

Published on: January 12, 2015

9.2K

網膜によるダイナミックな予測コーディング

Toshihiko Hosoya1, Stephen A Baccus, Markus Meister

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|July 8, 2005
PubMed
まとめ
この要約は機械生成です。

網膜は,新しい環境で視覚処理を動的に調整します. 網膜のギャングリア細胞は,受容領域を数秒以内に適応させ,新しい視覚統計の予測コーディングを改善します.

さらに関連する動画

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

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Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

11.1K

関連する実験動画

Last Updated: May 5, 2026

Live-imaging of the Drosophila Pupal Eye
09:54

Live-imaging of the Drosophila Pupal Eye

Published on: January 12, 2015

9.2K
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

20.3K
Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

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科学分野:

  • 神経科学は神経科学である.
  • コンピュータービジョン (Computational Vision) とは
  • センサリー処理 センサリー処理

背景:

  • 網膜のギャングリア細胞 (RGCs) は視覚情報を脳に伝達する.
  • RGCは,通常,原始光の強度ではなく,空間的差異と時間的変化をコードします.
  • この処理戦略は,平均的な自然環境統計に最適化された予測型コーディングと一致しています.

研究 の 目的:

  • 変化する視覚環境への反応として網膜処理のダイナミックな適応性を調査する.
  • 網膜のギャングリアン細胞受容領域が新しい画像統計に適応するかどうかを判断する.
  • 視覚処理におけるこれらの適応的変化の背後にあるメカニズムを理解する.

主な方法:

  • 網膜のギャングリオン細胞の時空受容場を記録する.
  • 動物を新しい視覚的統計を持つ環境にさらす.
  • プラスチックシナプスを持つネットワークモデルを使用して,観察された適応をシミュレートします.

主要な成果:

  • 網膜のギャングリオン細胞の受容領域は,新しい環境に遭遇した数秒以内に急速に変化します.
  • 感受性フィールドのこれらの変化は,新しい視覚統計の下での予測的なコーディングの効率を高めます.
  • 計算モデルが観察された適応変化を成功裏に複製し,シナプス可塑性の役割を強調しました.

結論:

  • 網膜は驚くべきダイナミックな適応能力を発揮し,環境の視覚統計に合わせて処理戦略を調整します.
  • 受容領域の急速な適応により,新しい環境における視覚情報処理の効率が向上する.
  • 神経ネットワークにおけるシナプス可塑性は,これらの適応性網膜計算のための妥当なメカニズムを提供します.