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"STAP" sulcus

An international research team recently discovered that a kind of brain groove called "temporal asymmetric pit (STAP)" in the human brain is unique to humans because it is not found in the brains of other primates' structures. The study of this structure will help clarify clues to human evolution and better understand the difference between the human brain and the brains of other primates.

An international research team has found that a sulcus in the human brain called the temporal asymmetry pit (STAP) is unique to humans because it cannot find a structure in the brains of other primates.
 
The study of this structure will help clarify clues to human evolution and better understand the difference between the human brain and the brains of other primates.

Related papers were published in the Proceedings of the National Academy of Sciences in the United States. The article describes how they scan the brains of people of all ages and compare them with other primates. The researchers believe that the discovery helps to better understand the evolutionary process of humans.

Medical scientists and doctors have known about STAP for some time, but no one has ever known how unique it is. This sulcus structure is 4.5 cm long on average, and the depth in the right hemisphere of the brain is greater than that in the left hemisphere.
 
No one knows why there are such grooves, but based on their location, researchers inferred that they may be related to brain communication.

According to a report by the physicist organization network on January 14, to learn more about STAP, researchers scanned the brains of 177 human volunteers and 73 chimpanzees. The analysis showed that this kind of groove exists in all human brains. But there is no trace in the brain of the chimpanzee.

The research team pointed out that in the right hemisphere of the brain, grooves involve facial recognition and motivational judgments, and perception of others. In the left hemisphere, the groove is obviously related to language ability.
 
Although the capacity of the human brain is about three times that of the chimpanzee brain, it is very difficult to find the functional difference between the two from the structure. One of the most well-known differential structures is Broca's area, also known as Broca's center and Broca's gyrus.
 
This area is the well-known motor speech center (speaking center). In the chimpanzee's brain, this area is relatively small, which may explain why its language ability is not as complex as that of humans.

Researchers have found that STAP is very obvious in the brains of all people, whether it is a fetus still in the womb or the elderly who have reached their old age.
 
This shows that this groove should be a genetic feature of humans. Researchers judged that this genetic feature may provide our species with unique insights into issues such as communication and social cognition and the development of cognitive abilities.
 
Since this feature does not exist in other primates, this discovery may tell us why the human brain is so unique. The researchers said that they will do further research to find the gene that causes the groove to appear, to help people better understand this unique structure and its function.

 

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