Scientists researching human speech believe that this ability likely evolved in the human brain during our evolution from primates, but the exact process remains unclear. These researchers can compare the human brain to that of other primates to study how it changed over time and gave rise to language.
Previous studies have proposed that groove-like structures in the front of the primate brain may aid humans in learning language. To explore if these and other brain changes are involved in language evolution, an international team of scientists recently compared the speech-related regions of human and primate brains. The primates they studied included baboons and chimpanzees.
Using high-resolution scans from sources like the National Chimpanzee Brain Resource and the Human Connectome Project database, the scientists analyzed specific areas of the human and primate brains to identify differences that may have contributed to the development of language.
They focused on brain regions controlling speech, facial expressions, and language, such as the prefrontal extent of the frontal skull (PFOP). They found that the PFOP is fully developed in humans, partially in chimpanzees, and absent in Old World monkeys.
Another notable difference in the human brain was the presence of a groove called the operculum, which was more pronounced on the left side. This suggests that the left hemisphere of the human brain has a larger PFOP compared to the right hemisphere, a feature not found in other primates.
By comparing chimpanzee brains, the researchers found that the size of the chimpanzee’s PFOP was consistent on both sides, indicating a recent full development of the PFOP in humans.
The scientists also examined the distance between two brain grooves, the circular sulcus and the operculum. Previous studies linked these grooves to communication sounds in chimpanzees, leading the researchers to investigate their role in human language development.
Based on their findings, the scientists suggested that the development of certain brain structures like the D-FO and V-FO grooves contributed to the emergence of human language. They emphasized the need for further research to understand how these structures function in the human brain.
In conclusion, changes in brain structures like the operculum and cerebral sulci likely play a role in human language acquisition, but more research is needed to fully understand this association. Future studies should explore how specific features like the PFOP function in the human brain to better comprehend their role in speech development.
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Source: sciworthy.com
