the Left and right hemisphere of the human brain are not exact copies of each other. Moreover, a specific list of differences is considered unique to our species. Researchers have linked it with speech, mind and mastery of guns. But now it turned out that the same picture is observed in other primates.
Details are described in a scientific paper published in the journal Science Advances.
most people Have a frontal lobe for a few more acts in the direction of the skull in the right hemisphere and the occipital – to-left. The pole of the temporal lobe and the cerebellum are also slightly more to the right than the left. There are other differences. Neuroscientists believe that this difference in anatomy leads to the difference in the left and right halves of the brain. For example, in most adult right-handers speech is processed predominantly in the left hemisphere.
brain Asymmetry detected in different animals. But the list of characteristics which differ from each other the left and right sides of the human brain are considered to be peculiar only to our species. Some scientists link these differences with the development of speech and other abilities in full has only of Homo sapiens. However, a new study has shown that this anatomical pattern is typical not only for us.
from Left to right endocrine human, chimpanzee, gorilla and orangutan. More exposed than their counterparts in the areas shown in orange, less speakers – blue.Illustration Simon Neubauer, CC BY-NC-ND 4.0.
the Authors sought to compare the structure of the brain human, chimpanzee, gorilla and orangutan. However, they have not studied directly the body and his prints on the inner surface of the skull (endocrine). The fact that bone, unlike soft tissue of the brain persist for a long time after the death of the animal. So the researchers where more skulls the higher apes, than OBRascov their brains.
it Turned out that the same character of asymmetry demonstrate chimpanzees, gorillas and orangutans. However, in chimpanzees it is less pronounced than in humans. But the other two species of monkeys in this sense, are not inferior people.
moreover, a person much more common are the individual deviations from the General pattern. Our “smaller brothers” in this sense is much more consistent. The authors suggest that the case for greater flexibility and plasticity of the human brain.
By the way, the work has interesting implications for paleoneurology. Now endocrine hominids, showing the typically human asymmetries of the cerebral hemispheres, can’t be considered as unambiguous evidence for “evolutionary advancement” of the bearer of this skull.
we will Add that earlier “News.Science” (nauka.vesti.ru) wrote about how Neanderthal genes gave the key to understanding the evolution of the human brain.