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Monkeys may have domesticated themselves - similar to humans

It is no coincidence that dogs are cuter than wolves, or that goats in the wild have shorter horns and friendlier manners than their wild ancestors. Researchers call these phenomena "domestication syndrome"

By: Princeton University, October 18, 2020. Translation: Ziv Adaki

Asif Ghazanfar, a professor of neuroscience and psychology at Princeton University, led a research group that showed that influencing the development of the vocal abilities of baby monkeys also leads to changes in the markers of domestication: a patch of white fur on their foreheads. Credit: Rebecca Terrett and Lauren Kelly, Ghazanfar Lab, Princeton
Asif Ghazanfar, a professor of neuroscience and psychology at Princeton University, led a research group that showed that influencing the development of the vocal abilities of baby monkeys also leads to changes in the markers of domestication: a patch of white fur on their foreheads. Credit: Rebecca Terrett and Lauren Kelly, Ghazanfar Lab, Princeton

It is no coincidence that dogs are cuter than wolves, or that goats in the wild have shorter horns and friendlier manners than their wild ancestors. Researchers call these phenomena "domestication syndrome" - the idea that excluding aggression from reproduction leads to physiological changes including: drooping ears, shorter muzzles and snouts, curlier tails, paler fur, smaller brains and more.

Both the physical and the behavioral changes seem to originate from certain neural crest cells, which appear in fetuses and newborns, and have a strong resemblance to stem cells. These neural crest cells can develop into a wide variety of cells, especially the cells of the adrenal gland - which increases the "fight or flight" response - and also affects other physical features, such as the development of larger teeth and firmer ears.

Since Darwin's time, some researchers have speculated that humans domesticated themselves - we chose less aggressive and more helpful pairings, thus diverting our own evolutionary trajectory.

Relationship between social behavior and domestication

"The evidence for this is largely circumstantial," says Asif Ghazanfar, a professor of psychology and neuroscience at Princeton University. "This is a very popular and exciting idea, but there is a lack of direct proof of its validity, that is, a linking link between sociable behavior and other characteristics of domestication." 

To see if this theory could be placed on a more stable foundation, Ghazanfar examined marmoset monkeys. Similar to humans, these primates are very sociable and cooperative, and in addition, they have several physical markers consistent with domestication, including a patch of white fur on their foreheads, common in domesticated mammals.

How is cooperation manifested in a monkey? Other signs, says Ghazanfar, include friendly voice exchanges, caring for each other's young offspring, and sharing food.

The research team showed that the size of the patch of white fur on the marmoset monkey's forehead was closely related to the frequency with which it produced friendly vocal responses to another. This is the first series of data to show a relationship between social behavior and a physical trait that characterizes domestication in individual animals.

To show the causal relationship between a white spot and vocal behavior, the researchers examined twin monkey pups. For very short periods of time, one twin received reliable vocal feedback from a simulated parent—a computer programmed to read an adult's calls and respond to 100% of the pup's vocalizations—while the other twin heard parental responses to 10% of his own vocalizations.

The experiments were conducted for 40 minutes, day and night, for most of the first 60 days of the monkey puppies' lives. In the remaining 23 hours of the day, the monkeys were with their families.

Puppies learned to "talk" faster

In previous work, Ghazanfar and his colleagues showed that pups that received more feedback learned to speak—or, more precisely, developed their adult vocalizations—faster than their siblings. By measuring the patches of fur on the foreheads of developing monkeys, the researchers found that the rate of developing whiteness on their faces was also accelerated by parental vocal responses. Thus, a developmental relationship was observed between the color of the facial fur and vocal development - both were influenced by parents.

This connection may occur through the neural crest cells, which can develop into "fight or flight" cells and can also contribute to the part of the throat needed to produce sounds.

Studies have linked domestication to changes in vocal behavior in other species as well. Jackals selected for training changed their vocal abilities in response to the presence of people. Similarly, the Bengal finch learns and produces more complex songs and has greater song flexibility in adulthood than its wild cousins.

However, this is the first study, of any kind, that links the level of a social trait to the size of a physical sign that characterizes domestication, said the researchers, whose research findings were published in the journal Current Biology.

"If you change the rate of vocal development in marmoset monkeys, you change the rate of their fur coloration," Ghazanfar says. "This is a series of results that is both fascinating and strange!"

for the scientific article

More of the topic in Hayadan:

18 תגובות

  1. From the article: "The idea that excluding aggression from reproduction leads to physiological changes including: drooping ears, shorter muzzles and snouts, curlier tails, paler fur, smaller brains and more."
    The empirical claim here is that domestication is correlated with a smaller brain and not just with paler fur ("whiteness").
    According to the embarrassing method of some of the racist writers here, whiteness is correlated with IQ level. But this is not the hypothesis that comes up in the study: according to the study there is a positive correlation between a social trait and the color white. On the other hand, empirically there is a negative correlation between brain size and white color. The reasonable hypothesis that may arise from this is that there is actually an inverse relationship between the color white and IQ. The fact that in IQ tests the results in Western societies such as in the USA may be different - this is easily explained by the fact that the socioeconomic level of whites affects through access to better education - on knowledge, practice and thinking skills as well as on other behavioral and practical parameters, which may be factors For an improved result in tests, that's all.
    However, apparently there is variation in the level of intelligence between different human groups, but this variation is not a direct function of variations in color, but rather a function of a primordial genetic drift phenomenon that occurred in communities that were very small in the past and maintained a high level of isolation from other human groups over long periods; Or a function of the opposite process, of constant genetic diversity - expressed in "genetic enrichment"; Populations that mix with each other through pairings with high genetic diversity - produce direct descendants that are more successful and more intelligent.
    In this matter of genetic diversity, the negative test case is in very close and close marriages, where the results are dire.
    The positive test case is in the populations that receive a high dose of new genes in a short or continuous historical time, as happened more than once with the Jews in their postcards. The process of genetic enrichment among the Jews is quite diverse in terms of absorption mechanisms. A profitable mechanism has always been the freeing of gentile slaves and turning them at once, by virtue of Torah law, into Jews for all intents and purposes. In all revelations, Jews who kept Gentile slaves - educated them to observe mitzvot on a partial level, and naturally, against the background of quasi-family relations, they used to free them, and in this, the slaves became, by virtue of Torah law, Jews for all intents and purposes. Another profit mechanism was a significant conversion of gentiles from the surrounding area, in certain periods. Usually in the third generation after liberation or conversion and sometimes even earlier, no one in the community remembered the inferior origin of the descendants of the liberated/immigrants, and their marriage in the community with "original Jews" was done freely. The descendants of the third or fourth generation mixed-breeds in question - were successful beyond the average. An example of this mechanism can be seen in the Babylonian Judaism of the second and third centuries AD, and in the Judaism of the Land of Israel of the first and second centuries AD, when an unusual proportion of the geniuses of the Mishnah and the Talmud were the descendants of freed and living slaves. European Jewry - which originated in Rome in the second century BC, began from its inception with an extraordinary genetic mixing, and continued to absorb genes significantly from the environment everywhere as long as it did not reach the place of Christianity and its canonical law, a law that prohibited conversion and enslavement of Jews. The upswing of excellence due to genetic enrichment is conditioned three or four generations after the cessation of the processes of genetic enrichment under environmental pressures (see: the relative decline of Spanish Jewry after the Golden Age, the decline of French Jewry after the period of Rashi and the Tosafs, and more). Such a process happened recently in Lithuania until the 15th century - only then did Christianity take over there and stop the process of genetic enrichment, but the consequences of the genetic enrichment for hundreds of years prior to the 16th century are still evident today, and it is possible that this is one of the sources of the extraordinary excellence of Lithuanian Jews in every field (this Judaism also developed a unique scholarly culture, and reinforced essential preference rules that intensified the phenomenon of excellence). In the countries of the East and North Africa, the process stopped much earlier - when Christianity took over a large part of the Near East and North Africa in the fourth century onwards until the seventh century. The weakening of genetic diversity was even more evident when Islam took over - starting in the seventh century. These Jewish communities managed to maintain intellectual excellence only for a short period of no more than a few hundred years - until their genetic diversity decreased significantly and relative genetic homogeneity was achieved.
    By the way, in Israel the phenomenon of genetic enrichment due to interfaith marriages should be a positive factor in the creation of intellectual excellence, despite an insufficiently invested education system and despite significant socioeconomic disparities, which reduce the accessibility of entire populations to a sufficient level of education. It is possible that this is where at least part of the explanation for the phenomenon manifested in the existence of an elite among the young and middle generation, on the order of 10%-15% of the reference groups, lies, an elite that has high intellectual abilities, which pulls all the other parts of the Israeli economy and society, which are quite mediocre in themselves - up.
    Now we can go back and try to see the difference in intellectual abilities of large human groups. The population of Africa, by virtue of its size and geographical continuity and the fact that it is a population that has never received significant portions of genes from distant populations, has had neither positive genetic drift nor genetic enrichment, and as far as sub-Saharan populations are concerned, it excels in relatively high genetic homogeneity. Not so the populations in Europe or parts of East Asia, especially in the last thousand years, or in a country of immigrants like the USA starting in the 17th century.
    My hypothesis is that a difference in intellectual abilities between populations - "races" - exists, to one degree or another, but it is definitely not a function of "color", and it is definitely a function of genetic diversity, mainly (genetic drift in small and isolated populations does not develop today).

  2. Avi Blizovsky India is still failing and China would have failed because of communism. Now China is in a much better situation because it has moved to an export economy and is now slowly moving to a consumption economy even though the regime remains communist.

  3. Avi Blizovsky I hope you understand what an average is? Of course when there are more than a billion Indians then there will be millions with a very high IQ, people who will be very successful and will immigrate and go to study in mobile American universities as above there are very smart blacks. Most legal immigrants had to be smart in the first place to be able to immigrate. But what counts is the average and here the Indians fall short of the white man. Chinese have a higher average IQ than the white person, so of course you will find them in the leading universities in the world, especially when there are more than a billion of them, such as Japanese and Koreans. And what do all these races have in common? Their color is white of course. If you still haven't understood, you probably don't want to understand or your whole life has taught you otherwise because the truth is sad, not "egalitarian" but this is nature and this is science. Now you will understand why the left encourages the mixing of races, in order to eliminate all these differences between humans and create one race in Z...

  4. Spring.
    The bacteria of the new settlers in America
    affect the health of local residents.

    and…?

    The fact that the white man had the intellectual and material ability to reach those people who had never, until that moment, imagined a white man, only reinforces the fact that the white man is superior in terms of material achievements, at least, to the non-white man.

    Material achievement is the highest quality attribute a person can achieve.

    Another fact is that,
    The white man has since only prospered further.
    See entry: "Where is the white man in America and where is the Indian".

    We have learned from history (which was recently written by people with a "white" color) that the monkeys who used tools were more socially successful than the monkeys who did not know how to use tools.

    People who have better tools experience more success in their use than others who do not have these tools.
    That's how it is in nature.

    This has nothing to do with the slavery of people with darker skin color.

    And the universities full of Indians and all -
    They are full of them for one reason:

    The Deep State realized that the whiter man did not believe him so the Deep State decided that the white man would fight the non-white man to decide who the Deep State would rule.

    That's why the Deep State set up different institutes for him to instill in the minds of the ignorant the things they "need to know".
    And in the process of assimilation and propaganda they hoped to get what they wanted.

    Today we are witnessing that your people are waking up and the corrupt rulers who have been ruling Europe and America for hundreds of years are beginning to tremble..
    Once again, the barbarians threaten Rome. 🙂

  5. And one more thing Nostradamus, I have proof that will disprove your thesis. Today the universities in the USA are full of Chinese and Indians, graduates of hundreds if not thousands of the new universities that have been established in the two countries in the last twenty years, some of them at a very high level. After all, China and India were also considered backward countries until the beginning of the century.

  6. https://www.hayadan.org.il/%d7%90%d7%99%d7%9a-%d7%94%d7%a2%d7%95%d7%9c%d7%9d-%d7%94%d7%9e%d7%95%d7%93%d7%a8%d7%a0%d7%99-%d7%a2%d7%95%d7%a6%d7%91-%d7%a2%d7%9c-%d7%99%d7%93%d7%99-%d7%9e%d7%92%d7%a4%d7%95%d7%aa-%d7%9c%d7%a4%d7%a0
    How the modern world was shaped by plagues 500 years ago
    Here the chain reaction is explained how epidemics wiped out most of the native American population, and as a result the settlers had to import slaves from Africa

  7. Avi Blizovsky
    You know very well that it all started long before…

    And colonialism is the property of the cloak wearers

    The Deep State of Europe which started the Deep State of America and since then tries to take over other countries and peoples and tries to establish its Deep State there.

    (See the entry ""The wearers of the robes"" in our country...
    The cloak wearers in Israel did not succeed (their cloak is actually not military like the Europeans)
    to transfer power back into their hands.
    Bibi makes them school.)

  8. Avi Blizovsky
    But it didn't happen in Nigeria, did it?
    Because that's how it is.. nature.
    In the end there is only "one result"
    And not - "all the results together".
    We learn from the result the course of nature.

    As his namesake Nazi understood.
    He understood the white supremacy you mentioned.

    But even if he was right or not - nature determines the course.

    And where do we stand after 75 years since the attempted application of that Torah?

    Was he right or will that name not be erased?

    dura lex….

  9. I recommend reading the book "Bacterial Guns and Steel" which explains why Europe was ahead of Africa.

    Regarding the connection between pigments and IQ, I find it amusing that Jews, who are not exactly known for being blonde with blue eyes, would write such a thing.

  10. Africa is genetically the most diverse continent, even though you don't want to notice it. Don't forget that one of the greatest powers in the ancient world was Egypt, which is of course in Africa.
    Just correcting my mistake, it all started with the discovery of America, and the robbing of many Africans and selling them into slaves which undermined the foundation of Africa's economy and made it easy prey for colonialist powers. The industrial revolution only increased colonization.

  11. Avi Blizovsky, the industrial revolution did not happen in Africa but in Europe for a good reason and not by chance or fate. And the reason is genetic of course

  12. Avi Blizovsky, until several hundred years ago before the arrival of the white man there was no written language in black Africa, no clothes, no agriculture and no use of the wheel, only mud huts and hunters for cats. To this day, in large parts of Africa, people live in mud huts. Black Africa is a poor and miserable hole with an extremely low IQ and the fantasies of the left and Hollywood will not change that. Wakanda and advanced technology only exist in movies and fantasies of blacks and leftists

  13. Anonymous, that is absolutely not true. The apparent supremacy of the white race began with the industrial revolution. If it had happened in Nigeria and not in England the situation would have been the opposite.

  14. In light of the findings in the unexpected, it is possible to go one more step further: perform the self-domestication method on people, preferably Israelis. In the beginning out of cooperation and if the experiment is successful also with legal coercion, to mark a white spot on the forehead of people who show alarming signs of a lack of sociability (you will choose the symptoms, and the scale of the sociability trait) to calm them down, moderate the understandable aggressiveness in their souls, and improve personal empathy and group solidarity. If we have the patience to continue the treatment over an evolutionary time, we may be able to start reading newspapers again, gather in the streets and even listen to politicians without the prevailing feeling today - of being exposed to violent behavior, encouraging conflicts and poor public discourse below the "homo-sapiens" standard

  15. Yasmin
    Friendly behavior and the color white are related to each other from an observation of human evolution. The man who moved away from Africa - to the north, and developed various tools that allowed him to survive and even prosper better than a Negro, made the white man more developed than the Negro (son of the land of Kush).
    And it is known that a developed person is more satisfied with life than a person who is less developed and as such angrier and more critical of the world around him (that is, more aggressive towards the environment).

  16. Jasmine is related to the IQ level and it has been proven that the darker the color then on average the person has a lower IQ, low IQ leads to lack of sociality, crime and violence due to inability to earn a living and jealousy. Even in dogs, for example, different breeds have different features and different intelligence. Facts cannot be racist. That is why multiculturalism and racialism fail and races should be separated and should not be mixed.

  17. Interesting - this section needs to be explored further - especially because of the potential politicization of linking the color white to friendly behavior. I really hope they don't try to project this onto humans.

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