How to find the crows Bashny.Net

Ravens are doing reasonable things - use tools, solve the puzzle and find out the person's face. Common ancestors of humans and birds have gone on different evolutionary path. The brain of humans and other primates, birds differs from the brain, but crows nevertheless able to count. How do they do it?

Researchers at the University of Tübingen вживили crows neyrosensory and learn to play the game associated with the score. Birds in three cases out of four correct to compare the number of black dots on the screen.




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The screen showed the crows gray circle with black dots in it - from one to five. Screen quenched, and there was a new gray circle with the same or different number of points. If the number of points is not changed, the crow pecked the screen and got a tasty prize.

Ravens showed no characters - it was not the point with the same location as the dominoes. The diameter and position of the points were arbitrary. Ravens important to correctly count the number and not know a familiar picture.

Half the number of points in the second image was equal to their number on the ground. In 75% of cases Ravens guessed, and most of the mistakes they made in the difference between the two images on a single point. This confirms the закон Weber - Fechner .

The law of Weber - Fechner - an empirical psychophysiological law consists in the fact that the intensity of sensation is proportional to the logarithm of the intensity of the stimulus. Blockquote> Chandelier in which eight light bulbs, seems equally bright chandeliers out of four light bulbs, as a chandelier of four brightly two chandeliers. If we add to the luster of the two light bulbs alone, the brightness will be significant growth. If you add one light bulb to the twelve - we did not notice. Ravens easily distinguish one point from two, but I was wrong when it was necessary to distinguish four of five points.

During the game, the work of five hundred individual neurons in the brain crows following sensors. About a hundred neurons varied depending on the number of pixels in the image. Each number corresponded to different combinations. Law Weber - Fechner showed themselves in action: a combination of neurons among "four" does not always help the crow to distinguish between the number "five", but "one" crow is easily distinguished from the "two."

The researchers noted that at the neuronal level, the process of determining the number of crows works as primates, but it is happening in different parts of the brain.

Source: geektimes.ru/post/252378/