The retina is found "built-in night vision"
Despite the fact that at dusk and in low light we can navigate, full night vision we have, unfortunately, no. However, it is possible that this feature is all the same "integrated" into our retina. Just in the course of evolution, people have lost this property, but in theory it is quite possible to return.
to this conclusion, as reported the journal Neuron, came a group of scientists from Canada and the United States. The fact that, according to statements of experts, the eye in the retina of mammals have several types of nerve cells, otvechayutschih for motion detection. Each group of cells is responsible for one of the four directions. If the objects relative to the observer are moving to the right - the right group is activated, if the left - the left and so on. Thus in very low light retina retains the ability to detect motion, but because of the lack of light we do not "see" it. Although virtually unchanged in fact, the nerve impulses. In a series of experiments, the researchers placed onto the retina laboratory animals electrode with which it was possible to trace the activity of neurons. As a result, it turned out that retinal cells react to the movement in the dark as well as in the light, but regardless of the direction of movement were active only those neurons that are responsible for movement up and down. As suggested by the researchers, this is due to the fact that it is in this direction tend to attack predators (jumping out of an ambush), thus preserving the activity of these cells is crucial for survival. Now the authors continue research with a view to find similar properties of neurons in humans, as well as to find out whether it is possible to change the sensitivity of the retina and give it the function of a full night vision.
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