The study shows what can be the first evidence of non-human animals actively selecting whom they relate to during aging. According to an idea in psychology known as the socio-emotional selective theory, or SST, older adults prefer more positive relationships because they realize that time is running out.
The team produced three categories: mutual friends, who both showed a preference for sitting with each other, one-sided friends where only one party showed a preference but the other did not, and non-friends where neither side preferred each other.
"What is really cool is that we found that chimpanzees are showing these patterns that reflect those of humans", said Alexandra Rosati, assistant professor of psychology and anthropology at the University of MI and one of the article's main authors.
Older males were also more likely to spend more time alone but interacted with more important social partners, like their aging mutual friends.
They found that the animals displayed much of the same behaviour ageing humans exhibit.
According to Machanda, the results - published in the journal Science - show that a sense of future time is not necessary for social circles to shrink with age, and that other factors may support behavior in humans and chimpanzees. They then rated the various pairs as mutual friendships, where both shimps seem to have enjoyed the relationship; One-sided friendship, where one shimp was more interested in being a friend than the other; And friendshiplessness, where chimps both show no interest in the other.
"There's really a pressing need to understand the biology of aging", Rosati said.
"More humans are living longer than in the past, which can change the dynamics of ageing". This holds that people prioritise established relationships as they grow older due to their own impending sense of mortality and the desire to make the best of available time.
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The study's co-authors are Lindsey Hagberg and Richard Wrangham, researchers at Harvard University; Drew Enigk, Melissa Emery Thompson and Martin Muller, researchers at the University of New Mexico; and Emily Otali, field director of the Kibale Chimpanzee Project.
The observations left the researchers baffled.
Or as Machanda said: "They can be very happy together".
To study their affinities for one another, the team developed an "association index" that was based on how often a male within a party was in close proximity (under five meters) to another, relative to how much they associated with all group members. These are categorized as mutual friendships while one-sided friendships are when one chimp prefers sitting close to another chimp but that other chimp doesn't share that habit.
There is more to aging than just gray hair and wrinkled skin. "When you have this kind of mutual friendship, you actually groom that individual more, so these older chimps have these mutual friendships and they're actually grooming those individuals quite a bit".
The scientists weren't entirely surprised by their findings. "We know that as humans age, their social networks shrink but their social bonds get stronger, and we see the same thing here in chimpanzees".
Another feature seen in older people was also seen in beans.
Prof Wranham added: "It raises the possibility that we are seeing behavioural systems that have been shared evolutionarily back to our common ancestor around seven or eight million years ago".
The British offer is not for all residents of Hong Kong, but only those holding a British National Overseas (BNO) passport. The spokesman emphasized that Hong Kong is a part of China, and therefore its affairs are China's internal affairs.
The number of cases increased by 40 percent over the past week, while the number of infections has been doubling every 15 days. Figures showed France nearing 1 million confirmed cases since the start of the pandemic, with 999,043 as of Thursday evening.
Les Sang et Or comptaient pourtant sur cette rencontre pour relever la tête après leur défaite face au LOSC le 18 octobre. Onze joueurs lensois auraient en effet été diagnostiqués positifs, ainsi que l'entraîneur Franck Aise.
This week's new COVID-19 cases account for 11% of all cases identified in the county since the beginning of the pandemic. There were eight deaths among suburban COVID-19 patients this week, down from last week when the board reported 12.
However, they need not be disappointed because some spinoff versions of the franchise are in the works. In 2019, producer Hiram Garcia, and in 2020, Dwayne Johnson have confirmed a "Hobbs & Shaw" sequel.
There were 171 games canceled this season by the coronavirus, which caused the league to suspend operations on March 11. Typically, a mid-June end to the finals is followed by about a 3 1/2-month break before the following training camp.
En effet, d'après les informations de L'Equipe , le milieu de terrain de 30 ans s'est envolé pour Doha, ce mardi après-midi. L'international algérien est officiellement de retour dans le groupe professionnel comme l'a indiqué le coach stéphanois.
Authorities say only five of those deaths occurred within the past 24 hours, with most from between October 17 and October 22. "The healthcare system might not be able to take care of you anymore in certain cases", she said in French from Quebec City.
The US dollar was firmer against Japan's currency at 104.73 yen, above a one-month low hit during the previous session at 104.345. The euro edged 0.16% lower against the USA dollar to US$1.8420, a fraction below a one-month high of US$1.8805 hit on Wednesday.
United States President Donald Trump on Saturday voted early in person for the presidential elections, in Florida, AFP reported . President Donald Trump talks with reporters after casting his ballot in the presidential election in West Palm Beach, Fla.
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The out-of-control crowd has transformed into a rally, with protesters moving towards the Arts Centre while shouting " freedom ". Mr Andrews urged protesters on Friday morning not to attend the Shrine because it was a sacred place for Victorians.
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Au milieu des danseurs, elle apparaît avec son petit ventre, avant de l'afficher clairement à la toute fin de son clip. Cependant l'artiste n'a pas révélé l'identité du père du bébé à venir ni la date à laquelle ce dernier doit arriver.
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U.S. talks with Armenia, Azerbaijan fail to reach pact
It also said Armenia had fired three ballistic missiles at three regions inside Azerbaijan but Armenia denied this. The US, Russia and France, who have long led mediation efforts, have so far ignored demands for a Turkish role.