How does a person perceive colors

How We See Color - Colm Kelleher (Health And Medical Video April 2018).

Man, unlike most animals, has a better sight. For example, due to the structure of the retina, a person is able to distinguish between different colors.

The color vision of a person is determined by the features of the structure of the eye. In the retina of the eye there are special photosensitive receptors of two types - sticks and cones. Sticks have a higher sensitivity and are responsible for twilight and night vision, cones - in color.

Color vision

Human color vision is due to the presence of three types of photoreceptors, or flasks, each of which has a different spectral sensitivity. Each type of receptor contains a specific pigment, so that the maximum sensitivity of each type of cone is one of three basic colors: red, blue or green.

However, this does not mean that one kind of receptor "sees" only one color: all the photoreceptors have a rather wide zone of sensitivity that overlaps the receptor zones of other species, this allows you to take a lot of different shades.

The color that a person sees is about the greatest stimulation of a particular type of flask. If the light excites equally all types of receptors, then it is perceived as white, for example, sunny daylight.

The absence of one or several kinds of photoreceptors leads to disturbances in color vision, in which a person can not distinguish between those or other shades, depending on which receptor is absent. However, the lack of only one type of photoreceptor may remain unnoticed to humans, leading only to a slightly different perception of colors and shades.

Perception of color

The human eye perceives information about the image, the color with the help of eye structures, but, in essence, we see the brain. The information obtained from the excitation of eye cells is transmitted through the nerve pathways to the cerebral cortex, where complex processing and adjustment of the data is carried out, and as a result, we perceive what we see as the only color picture.

Due to the complex structure and mechanisms for processing information coming from the visual analyzers in the brain, a person also has other amazing abilities.

  • Color memory allows a person to associate certain objects of the surrounding reality with flowers: even in the imagination, we know that the sky is blue, and the grass is green, and we can reproduce these colors.
  • Cognitive discoloration allows us to perceive the color of objects without taking into account the illumination. Thanks to the color memory and the processing of visual information, a person can perceive the colors of objects equally, even in different lighting conditions.
  • Color constancy also allows you to perceive the constant color of objects, regardless of the brightness of the light and its shade.

The mechanism of color perception is extremely complex and not fully understood, but it is thanks to him that we can perceive the reality of our surroundings in all varieties of colors and shades. Moreover, psychological and socio-ethnic factors play a role in perceptions and feelings of color.

It is known that colors can even have a physiological effect on a person and change its psycho-emotional state.



How does a person perceive colors

Category Of Medical Issues: Diseases

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