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That gray color is called internal gray, or Eigengrau. Sometimes it is also called brain gray, dark light, or other names. It is a dark gray color that people see in complete darkness. There has been talk of the fact that man has not seen black in the dark since the 19th century, but scientists have been interested in this phenomenon recently.
In fact, it is a strange phenomenon. A person can see a completely black color. If you stop somewhere away from the city lights at midnight and look up at the sky, it will look black. However, if you don’t turn on the light when you return home, you will quickly notice that you are seeing gray instead of black. Even if you close your eyes.
That inner gray is noticeably lighter than true black. Also, it is not very clean, it is not a solid and smooth color. But scientists even have some explanations for why this may be the case.
You’ve known for a long time that the human eye gets used to the dark. If you enter a completely dark room, it will take a few minutes to adjust and you can even see this one. Scientists believe that in complete darkness, our visual system tries to adapt and highlight the smallest details. Those details are only missing if there is no light, and we only get a gray color, slightly lighter than black.
It can also be noise. The visual system is based on the transmission of nerve impulses. In other words, the transmission of electrical impulses. We know from electronics that it is almost impossible to avoid noise in such systems, very small disturbances. The researchers conducted experiments with human toads and stems, retinal receptors that are sensitive to low light. It turned out that there was indeed noise in them, impulses that would create the illusion of such a gray color.
Finally, researchers cannot rule out the version that spontaneous neurotransmitter release is responsible for internal gray. But everything can be related to a version: our brain and visual system are trying to find at least something significant in total darkness. This explains why we do not see the gray inside when there are bright objects in the environment: the visual system concentrates on them.
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