Researchers are wrong about the left brain, The left and right sides of our brain specialize in several cognitive skills. For example, in humans the tongue is mainly processed in the left hemisphere and the right hand is controlled by the motor cortex in the left hemisphere.
Functional lateralization is reflected in the morphological asymmetry of the brain. Left and right hemispheres differ subtly in brain anatomy, distribution of nerve cells, connectivity and neurochemistry.
Asymmetry of the outer shape of the brain is also seen in endocasts. Most people have a combination of a more convex left occiput (behind the brain) and a more convex right forehead. Brain asymmetry is usually interpreted as important for the functioning and perception of the human brain, because it reflects functional lateralization. Researchers are wrong about the left brain.
However, comparative studies between primates are rare and it is unknown which aspects of brain asymmetry are truly unique to humans.
Based on previously available data, scientists have suggested that many aspects of brain asymmetry have recently been developed after the human line has been separated from the line of our closest living relative, chimpanzees. Now the Researchers are wrong about the left brain.
The team found that the level of asymmetry was more or less the same in humans and most monkeys. Only chimps are on average less asymmetrical than humans, gorillas and orangutans.
They also examined patterns of asymmetry and were able to prove that not only humans, but also chimpanzees, gorillas and orangutans exhibited patterns of asymmetry previously described as humans: left occipital lobes, right frontal lobes and right temporal poles and right ceremonies.
The discovery of a general model of asymmetry but greater variability in humans is very interesting to interpret the evolution of the human brain.
The endocast of one of our fossil ancestors, which shows this asymmetry, can no longer be interpreted as evidence for lateralization of a special functional human brain without other (archaeological) data.
Researchers say: This common pattern of brain asymmetry develops before the beginning of the human birth line. Humans seem to have built this morphological model to build functional brain lateralization associated with typical human behavior.