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Tuesday, November 13, 2012

"Needless to say a hunter gatherer that did not correctly conceive a solution to providing food or shelter probably died along with their progeny, while a modern Wall Street executive that made a similar conceptual mistake would receive a substantial bonus," Crabtree explains.



Controversial study suggests human intelligence peaked several thousand years ago and we've been on an intellectual and emotional decline ever since

MONDAY 12 NOVEMBER 2012
Is the human species doomed to intellectual decline? Will our intelligence ebb away in centuries to come leaving our descendants incapable of using the technology their ancestors invented? In short: will Homo be left without his sapiens?
This is the controversial hypothesis of a leading geneticist who believes that the immense capacity of the human brain to learn new tricks is under attack from an array of genetic mutations that have accumulated since people started living in cities a few thousand years ago.
Professor Gerald Crabtree, who heads a genetics laboratory at Stanford University in California, has put forward the iconoclastic idea that rather than getting cleverer, human intelligence peaked several thousand years ago and from then on there has been a slow decline in our intellectual and emotional abilities.
Although we are now surrounded by the technological and medical benefits of a scientific revolution, these have masked an underlying decline in brain power which is set to continue into the future leading to the ultimate dumbing-down of the human species, Professor Crabtree said.
His argument is based on the fact that for more than 99 per cent of human evolutionary history, we have lived as hunter-gatherer communities surviving on our wits, leading to big-brained humans. Since the invention of agriculture and cities, however, natural selection on our intellect has effective stopped and mutations have accumulated in the critical “intelligence” genes.
“I would wager that if an average citizen from Athens of 1000BC were to appear suddenly among us, he or she would be among the brightest and most intellectually alive of our colleagues and companions, with a good memory, a broad range of ideas and a clear-sighted view of important issues,” Professor Crabtree says in a provocative paper published in the journal Trends in Genetics.
“Furthermore, I would guess that he or she would be among the most emotionally stable of our friends and colleagues. I would also make this wager for the ancient inhabitants of Africa, Asia, India or the Americas, of perhaps 2,000 to 6,000 years ago,” Professor Crabtree says.
“The basis for my wager comes from new developments in genetics, anthropology, and neurobiology that make a clear prediction that our intellectual and emotional abilities are genetically surprisingly fragile,” he says.
A comparison of the genomes of parents and children has revealed that on average there are between 25 and 65 new mutations occurring in the DNA of each generation. Professor Crabtree says that this analysis predicts about 5,000 new mutations in the past 120 generations, which covers a span of about 3,000 years.
Some of these mutations, he suggests, will occur within the 2,000 to 5,000 genes that are involved in human intellectual ability, for instance by building and mapping the billions of nerve cells of the brain or producing the dozens of chemical neurotransmitters that control the junctions between these brain cells.
Life as a hunter-gatherer was probably more intellectually demanding than widely supposed, he says. “A hunter-gatherer who did not correctly conceive a solution to providing food or shelter probably died, along with his or her progeny, whereas a modern Wall Street executive that made a similar conceptual mistake would receive a substantial bonus and be a more attractive mate,” Professor Crabtree says.
However, other scientists remain sceptical. “At first sight this is a classic case of Arts Faculty science. Never mind the hypothesis, give me the data, and there aren’t any,” said Professor Steve Jones, a geneticist at University College London.
“I could just as well argue that mutations have reduced our aggression, our depression and our penis length but no journal would publish that. Why do they publish this?” Professor Jones said.
“I am an advocate of Gradgrind science – facts, facts and more facts; but we need ideas too, and this is an ideas paper although I have no idea how the idea could be tested,” he said.
THE DESCENT OF MAN
Hunter-gatherer man
The human brain and its immense capacity for knowledge evolved during this long period of prehistory when we battled against the elements
Athenian man
The invention of agriculture less than 10,000 years ago and the subsequent rise of cities such as Athens relaxed the intensive natural selection of our “intelligence genes”.
Couch-potato man
As genetic mutations increase over future generations, are we doomed to watching  soap-opera repeats without knowing how to use the TV remote control?
iPad man
The fruits of science and technology enabled humans to rise above the constraints of nature and cushioned our fragile intellect from genetic mutations.

4 comments:

  1. Told ya so. It's all the fault of us farmers. Campbell mentioned it early on.

    The brain of Cro-Magnon versus Modern Man: a matter of size - Inria
    www.inria.fr/en/centre/rennes/news/cro-magnon-vs-modern-man
    Jan 26, 2011 – The brain of Cro-Magnon versus Modern Man: a matter of size ... and the cerebellum have become enlarged compared with our predecessors.
    Why are our brains shrinking? - YouTube
    ► 6:21► 6:21

    www.youtube.com/watch?v=8i238fyDjVgSep 26, 2010 - 6 min - Uploaded by anunnaki101
    Why does Cro Magnon have a much larger brain than "modern man" ... bodies, why did the brontosaurus ...
    More videos for cro magnon brain size compared to ours »
    Cro Magnon skull shows that our brains have shrunk
    phys.org/news187877156.html
    Mar 15, 2010 – The researchers found that the Cro Magnon brain appears to have ... But what is the sample size of Cro magnon studies? ... I think that there is a difference between essential and nonessential relative to ensuring the survival ...
    Chapter 2: The Human Brain: Its Size and Its Complexity
    www.custance.org/old/animal/ch2a.html
    When we compare man with the animals which are structurally most like him, and are .... Yet Cro-Magnon had a slightly larger brain capacity than Neanderthal ... etc., wrote: "It remains sadly true that most of our present understanding of mind ...
    Cro-Magnon - RationalWiki
    rationalwiki.org/wiki/Cro-Magnon
    Oct 24, 2012 – Cro-Magnon Man is the name informally given by anthropologists to the first ... 1 Popular imagination and definition; 2 Brain size and intelligence; 3 See ... The achievements of Cro-Magnon were somewhat comparable to what ... Cro-Magnon Man; ↑ Cro Magnon skull shows that our brains have shrunk ...
    Images for cro magnon brain size compared to ours
    - Report images

    Neanderthal vs Cro Magnon | Musings from the Chiefio
    chiefio.wordpress.com/2011/11/20/neanderthal-vs-cro-magnon/
    Nov 20, 2011 – So who knows where the robustness and brain size of Cro Magnon came from, ... Separate research challenges the idea that the reason our ...
    Our Brains Are Shrinking. Are We Getting Dumber - NPR
    www.npr.org/2011/.../our-brains-are-shrinking-are-we-getting-dumb...
    A description for this result is not available because of this site's robots.txt – learn more.
    If Modern Humans Are So Smart, Why Are Our Brains Shrinking ...
    discovermagazine.com/.../25-modern-humans-smart-why-brain-shrin...
    Jan 20, 2011 – Still others believe that the reduction in brain size is proof that we have ... Called the Cro-Magnons, they had barrel chests and huge, jutting jaws with ... As he points out, comparable warming periods occurred many times over ...
    Are Shrinking Brains Making Us Smarter? : Discovery News
    news.discovery.com › Human News
    Feb 7, 2011 – The average size of the human brain has decreased by about 10 percent ... Evolution may be making our brains leaner and more efficient. The same phenomenon can be observed in domestic animals compared to their wild counterparts. ... The Cro-Magnons who left cave paintings of large animals in the ...
    Cromagnon Brain Proves Our Brains Shrunk


    There may be more to it however. Bigger doesn't necessarily mean better. But...who knows for sure. We don't have their test scores.

    ReplyDelete
  2. And what do test scores really mean?


    Mircea Eliade who wrote on primitive and early spirituality thought it the equal or more authentic than ours, if IIRC.

    How you judge this is a good question. By its fruitfulness for life, I guess.

    And with the barley came the beer.

    ReplyDelete
  3. If the machines fail, as in Deliverance, we will go back to fighting and fucking our way back up the cliff, so James Dickey. But even there, it is odd. The guy that can play the banjo best is a kind of inbred albino.

    ?

    ReplyDelete
  4. the machines are gonna fail

    http://www.youtube.com/watch?v=g9LVRHigxiE


    http://www.youtube.com/watch?v=zz3ic9ZNXNU


    I, for one, hope they don't.

    ReplyDelete