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Visual System01:26

Visual System

2.2K
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...
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Light Acquisition02:16

Light Acquisition

9.7K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
9.7K
Vision01:24

Vision

60.9K
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.
60.9K
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

28.7K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
28.7K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

10.4K
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,...
10.4K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

11.0K
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...
11.0K

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相关实验视频

Updated: Mar 7, 2026

Visualizing Visual Adaptation
04:43

Visualizing Visual Adaptation

Published on: April 24, 2017

9.7K

颜色在场景搜索过程中需要亮度来进行视觉选择.

Anke Cajar1, Jochen Laubrock2

  • 1Department of Psychology, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany.

Attention, perception & psychophysics
|March 6, 2026
PubMed
概括

亮度对比性在指导视觉搜索时比色彩对比性更有效. 在场景搜索过程中,颜色只有在与亮度对比度相配合时才能有效地使用.

科学领域:

  • 视觉感知 视觉感知 视觉感知
  • 认知心理学 认知心理学
  • 神经科学是一个神经科学.

背景情况:

  • 视觉搜索依赖于低级别的特征,如颜色和亮度对比.
  • 边缘色彩敏感性是有争议的,但颜色被认为对视觉搜索很重要.

研究的目的:

  • 调查颜色和发光强度对萨卡德目标选择对比的独立贡献.
  • 在对象在场景搜索中确定外围颜色与亮度信息的效率.

主要方法:

  • 使用注视条件移动窗口显示器来隔离外围视力.
  • 呈现的仅颜色和仅发光度在不同尺寸窗口的外围视觉中形成对比.
  • 测量了saccade目标选择和搜索性能.

主要成果:

  • 边缘目标选择和搜索性能在光度对比下显著更高效.
  • 颜色对比度很少被用于超出膜.
  • 当颜色和亮度对比同时发生时,搜索效率得到了提高.

结论:

  • 亮度对比在外围视觉搜索中起着主导作用.
  • 边缘色彩信息在孤立的情况下效率较低,并且在与亮度对比度相结合时主要有助于搜索.
关键词:
颜色的感知 颜色的感知眼球追踪器 眼球追踪器凝视可能的显示器亮度感知的感知场景感知 场景感知视觉搜索 视觉搜索 视觉搜索

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Last Updated: Mar 7, 2026

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  • 有效的场景搜索取决于颜色和亮度对比的联合可用性.