まとめ
カラー対抗性ギャングリオン細胞は,相変化により,高時間の周波数で波長選択性を失います. このことが,色彩と光度が点滅する時の人間の知覚の違いを説明している.
科学分野:
- 神経科学は神経科学である.
- ビジョン ビジョン 科学 科学
- 網膜生理学 網膜生理学とは
背景:
- 網膜のカラー対抗性ギャングリア細胞は,低時間の周波数で波長選択性を示す.
- この選択性は,中心と周囲の受容場メカニズム間の敵対的な相互作用に起因する.
研究 の 目的:
- テンポラル周波数が網膜のギャングリオン細胞の色オポネンスにどのように影響するかを調査する.
- 高周波の波長選択性の変化に起因する根本的なメカニズムを理解する.
主な方法:
- 猿の網膜のギャングリアン細胞からの電気生理学的記録.
- 異なる時間周波数で,光度と色彩の閃きによる刺激.
- 細胞反応の分析により,スペクトル選択性と相変化を決定する.
主要な成果:
- カラー対抗のギャングリオン細胞は,高時間の周波数での光度フラッチャーに反応する.
- 時間の周波数が増加するにつれて,波長選択性は徐々に失われます.
- 周波数依存の相変化により,中心と周辺のメカニズムは高周波で敵対的ではなく,相乗的になる.
結論:
- 高時間の周波数における色対極性の喪失は,受容場メカニズムにおける相変化によって説明される.
- この現象は,人間の視界における色彩と光度のの間の明確な知覚の違いを理解するための基礎を提供します.
関連する概念動画
01:18Imaging Biological Samples with Optical Microscopy
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
01:26Phase Contrast and Differential Interference Contrast Microscopy
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
01:37Super-resolution Fluorescence Microscopy
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
01:19Pigmentation
The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
01:22Photoreceptors 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...
01:24Color 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.