The relationship affects the brains of rhesus macaques

rhesus macaque

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What is the relationship between social life and the nature of the brain? Researchers from the University of Pennsylvania, the Stem Cell and Brain Research Institute at Inserm, and elsewhere are the closest to understanding this relationship for rhesus macaques.

In the process published on Scientific advances, The team found that for these non -human factors the number of relationships that predicted the number of key nodes in the parts of the brain responsible for decision making and empathy. Specifically, the researchers concluded that, for macaques with more trained mates, the mid-superior temporal sulcus (STS) and ventral-dysgranular insula developed significantly. They do not understand the connection between the brain and other organs, such as social status.

“For the first time, we were able to relate the social complexity of a group of living primates to the nature of the brain,” said Camille Testard, a four -year medical student at Platt Labs in Penn. and lead author of the paper. .

The first research on human resource systems demonstrated this relationship, said Michael Platt, the James S. Riepe Penn Integrates Knowledge University Professor. “The document, for example, is about changing the size of the amygdala to the number of Facebook friends you have.”

With rhesus macaques living on Cayo Santiago, an island off the coast of Puerto Rico, however, it’s a different story. Platt and colleagues studied this group of free nonhuman primates for ten years. Part of that research was focused on training partners, showing direct and important correlations for macaques, and looking at the animal’s broad -spectrum network functions, revealing that those with whom they associate without.

In the aftermath of Hurricane Maria on the island, for example, researchers have speculated that macaques grow or decline in their online business in the face of scarce resources. Testard, who joined the lab in 2018, led the review for that research, which found that animals have become more sociable and more accepting of each other, creating relationships. again with what they have.

Building on that and previous work from co -founder Jérôme Sallet of Inserm, Testard also designed the current research. Here, the team recorded the specific relationships of a community group of 68 parent rhesus macaques in Cayo Santiago, and then looked at five factors: social status, number of breeding partners, physical distance with the monkeys ’. more, about the famous monkeys on the web, and what they are. the researchers called it “in between,” or the ability to act as a bridge between separate parts of the system. They also collected brains for each person in the community, including 35 teenagers and infants.

Looking at adult data, Testard and colleagues found that the more dementia partners each person had, the higher their mid-STS and ventral-dysgranular. insula. “It’s very interesting to see these countries, because they show their importance for social knowledge to the people,” Sallet said. “We also saw the central STS in another study which showed that performance in this country was changed by the forecast of other species.”

One unexpected thing about babies. According to Testard and colleagues, the work has shown that young macaques are not born with these brain differences, but that differences arise as they grow.

“There’s something about the skills to make and take care of the many friends you get from your parents. You think it’s written in your brain when you’re born, but it’s much better coming out of the principles and relationships you have, ”Platt said. “Maybe if your mother is connected and you have the power to communicate, your brain can mature in the same way as we know it. It’s interesting.”

This suggests a negative outcome, Sallet said. “If we know the same relationship, it means that if you were born of a very famous mother then you have a brain that thinks you will be famous in the future. We know that you have a strong leadership. By our communities, perhaps more than our innate predisposition. ”

While all of this knowledge is relevant to free -ranging rhesus macaques, they do have implications for human behavior, including the understanding of neurodevelopmental disorders such as autism, according to Platt.

Such relationships are at a distance. Now, the team is moving on with more research studying the population of Cayo Santiago macaques, looking at areas such as natural disasters such as Hurricane Maria that affect the brain. of animals and how social interaction relates to longevity. They will continue to dive deeper into their latest knowledge.

“This is not a lab event. This is real life, the real world,” Platt said. “This work provides a basic level of understanding how these animals move. This work that has been done in the field of synergizing work that we are doing in the field is fun and exciting. lab for a long time. ”


In the aftermath of Hurricane Maria, rhesus macaques in Puerto Rico sought new social connections


More information:
Camille Testard et al, predicted the correlations of brain structure in a free-ranging multidimensional primate group, Scientific advances (2022). DOI: 10.1126 / sciadv.abl5794. www.science.org/doi/10.1126/sciadv.abl5794

Presented by the University of Pennsylvania

Directions: Social interaction with the brain of rhesus macaques (2022, April 13) retrieved 13 April 2022 from https://phys.org/news/2022-04-social-brain-rhesus-macaques. html

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