Speech movement of people and facial expressions of monkeys developed in a similar way. Scientists believe that mimic the movement of primates that were independent of chewing, could be the basis for the development of speech.
There are various hypotheses to explain the emergence of speech in humans. According to one, it originates from the sounds of primates. However, the monkeys screaming from birth, they do not learn this audio communication, and over time it is they have not changed. And human speech develops, the individual gradually learns to publish meaningful sounds.
According to the new hypothesis put forward by researchers from Princeton University and verbal ability evolved from ape facial grimaces. Grimace know how many species of monkeys. They’re smacking each other to confirm the friendly contact with any sound they emit, vocal cords and larynx remain indefinitely. It occurs with the participation of the two systems: the air is pumped respiratory muscles through the vocal cords, and then the sound changes movements of the lips, cheeks and tongue. Facial movements by themselves do not produce any sound, but they are essential to the development of speech.
Researchers have tried to find out whether the similarities between apes and smack babies babble. When a child learns to make sounds, the first of his facial movements are very slow and have a different rhythm. When a child grows, his voice mimicry is becoming more streamlined and rapid. In contrast, facial, chewing movements are formed from birth. This suggests that these movements are controlled by different divisions of the nervous system.
Scientists have observed the rhesus monkeys of different ages and noticed that the facial gestures of apes evolved like human speech movements. Facial expressions in rhesus improved regardless of chewing movements. By the way, the last and in monkeys and humans, too, were in their development the same steps.
According to the materials Sciencemagic.ru