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Researchers Say Humans Didn’t Wipe Out the Neanderthals

  • Posted on February 28, 2012 at 8:01 am

new xmen neanderthals

I thought the idea that humans killed off the Neanderthals was already losing currency. And now a paper published in the journal Molecular Biology and Evolution casts more doubt on that particular hypothesis.

i09′s Alasdair Wilkins summarizes:

A team of Spanish and Swedish researchers say that new DNA evidence paints a far grimmer view of the state of Neanderthals. Their analysis suggests the Neanderthal population had crashed 50,000 years ago, and a relatively small band of survivors then recolonized central and western Europe before their final end 20,000 years later. In a statement, Love Dalén of the Swedish Museum of Natural History explained what they discovered:

Instead the paper’s authors suggest climate change had a greater impact on neanderthals than previously thought.

Alasdair Wilkins writes: “This also raises the question of just how humans would have really fared against a Neanderthal population at full strength. I’m sensing some pretty serious alternate history fodder here…”

i09: The extinction of Neanderthals had nothing to do with us

Image from New X-Men

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Reason Is Used for Justification, Not to Determine Truth

  • Posted on June 15, 2011 at 10:18 am

protagoras Reason Is Used for Justification, Not to Determine Truth

For centuries thinkers have assumed that the uniquely human capacity for reasoning has existed to let people reach beyond mere perception and reflex in the search for truth. Rationality allowed a solitary thinker to blaze a path to philosophical, moral and scientific enlightenment.

Now some researchers are suggesting that reason evolved for a completely different purpose: to win arguments. Rationality, by this yardstick (and irrationality too, but we’ll get to that) is nothing more or less than a servant of the hard-wired compulsion to triumph in the debating arena. According to this view, bias, lack of logic and other supposed flaws that pollute the stream of reason are instead social adaptations that enable one group to persuade (and defeat) another. Certitude works, however sharply it may depart from the truth.

The idea, labeled the argumentative theory of reasoning, is the brainchild of French cognitive social scientists, and it has stirred excited discussion (and appalled dissent) among philosophers, political scientists, educators and psychologists, some of whom say it offers profound insight into the way people think and behave. The Journal of Behavioral and Brain Sciences devoted its April issue to debates over the theory, with participants challenging everything from the definition of reason to the origins of verbal communication.

New York Times: Reason Seen More as Weapon Than Path to Truth

(Thanks Bill)

This evolutionary psychology explanation is (like most evol pysch) speculative. Regardless of whether reason evolved “for” the purposes of argument, or merely reached a point where it was flawed but “good enough” we may never know. But I do think most people use reason more to defend their positions rather than to arrive at accurate positions (what does that mean for me, and my arguments?) To quote Michael Shermer in Why People Believe Weird Things, “Smart people believe weird things because they are skilled at defending beliefs they arrived at for non-smart reasons” (via that Cracked article).

See also Systematic Ideology and Cultural Cognition.

From http://technoccult.net/archives/2011/06/15/reason-is-used-for-justification-not-to-determine-truth/

Humanity’s Next Evolution May Be Mental, Not Biological

  • Posted on February 28, 2011 at 12:24 pm

Mark Changizi, author of the upcoming book Harnessed: How Language and Music Mimicked Nature and Transformed Man, writes:

Where are we humans going, as a species? If science fiction is any guide, we will genetically evolve like in X-Men, become genetically engineered as in Gattaca, or become cybernetically enhanced like General Grievous in Star Wars. [...]

Simply put, none of these scenarios are plausible for the immediate future. [...]

We have already been transformed via harnessing beyond what we once were. We’re already Human 2.0, not the Human 1.0, or Homo sapiens, that natural selection made us. We Human 2.0’s have, among many powers, three that are central to who we take ourselves to be today: writing, speech, and music (the latter perhaps being the pinnacle of the arts). Yet these three capabilities, despite having all the hallmarks of design, were not a result of natural selection, nor were they the result of genetic engineering or cybernetic enhancement to our brains. Instead, and as I argue in both The Vision Revolution and my forthcoming Harnessed, these are powers we acquired by virtue of harnessing, or neuronal recycling.

In this transition from Human 1.0 to 2.0, we didn’t directly do the harnessing. Rather, it was an emergent, evolutionary property of our behavior, our nascent culture, that bent and shaped writing to be right for our visual system, speech just so for our auditory system, and music a match for our auditory and evocative mechanisms. [...]

The road to Human 3.0 and beyond will, I believe, be largely due to ever more instances of this kind of harnessing. And although we cannot easily anticipate the new powers we will thereby gain, we should not underestimate the potential magnitude of the possible changes. After all, the change from Human 1.0 to 2.0 is nothing short of universe-rattling: It transformed a clever ape into a world-ruling technological philosopher.

Seed: THE NEXT GIANT LEAP IN HUMAN EVOLUTION MAY NOT COME FROM NEW FIELDS LIKE GENETIC ENGINEERING OR ARTIFICIAL INTELLIGENCE, BUT RATHER FROM APPRECIATING OUR ANCIENT BRAINS

(via Justin Pickard)

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New Evidence Suggests Neanderthals Cooked and Ate Vegetables

  • Posted on February 25, 2011 at 10:47 am

neanderthal New Evidence Suggests Neanderthals Cooked and Ate Vegetables

Researchers in the US have found grains of cooked plant material in the teeth of the remains.

The study is the first to confirm that the Neanderthal diet was not confined to meat and was more sophisticated than previously thought.

The research has been published in the Proceedings of the National Academy of Sciences.

The popular image of Neanderthals as great meat eaters is one that has up until now been backed by some circumstantial evidence. Chemical analysis of their bones suggested they ate little or no vegetables.

BBC News: Neanderthals cooked and ate vegetables

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As Humans Evolve, Our Brains Are Actually Getting Smaller

  • Posted on January 4, 2011 at 7:51 pm

leader  As Humans Evolve, Our Brains Are Actually Getting Smaller

Today’s human brain is about 10 percent smaller than the Cro-Magnon brain from more than 20,000 years ago.

When it comes to brain size, bigger doesn’t always mean better. As humans continue to evolve, scientists say our brains are actually getting smaller. [...]

Cro-Magnon man, who lived in Europe 20,000 to 30,000 years ago, had the biggest brains of any human species. In comparison, today’s human brain is about 10 percent smaller. It’s a chunk of brain matter “roughly equivalent to a tennis ball in size,” McAuliffe says.

The experts aren’t sure about the implications of this evolutionary trend. Some think it might be a dumbing-down process. One cognitive scientist, David Geary, argues that as human society grows increasingly complex, individuals don’t need to be as intelligent in order to survive and reproduce.

But not all researchers are so pessimistic. Brian Hare, an anthropologist at the Duke University Institute for Brain Sciences, thinks the decrease in brain size is actually an evolutionary advantage.

NPR: Our Brains Are Shrinking. Are We Getting Dumber?

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How Technology Made Us Humans

  • Posted on August 31, 2010 at 4:01 pm

comingman How Technology Made Us Humans
The Man of Year Million

In his book, “The Artificial Ape,” anthropologist and archaeologist Timothy Taylor makes the startling claim that we did not make tools, tools made us.

He reminds us that the oldest stone tools we’ve found are 2.5 million years old. But the genus to which we belong, Homo, is only 2.2 million years old, at least according to the current fossil record. Our species, Homo sapiens, has been around for less time than the gap between tool creation and our genus.

In a fascinating interview with New Scientist, Taylor believes “earlier hominids called australopithecines were responsible for the stone tools . . . The tools caused the genus Homo to emerge.”

How does that reverse the human-technology equation? Taylor believes that the creation of tools – in his example a sling to carry an infant – is “how encephalisation took place in the genus Homo.” The creation of technology to take care of infants allowed them to be born more helpless. In other words, the development of initial tech allowed evolutionary forces to shape us in a particular fashion. In fact, perhaps forced them to do so.

ReadWriteWeb: How Technology Made Us Humans

Will our brains shrink due to our external ones? Not necessarily. The current trend is a demand for more and more intelligent and educated people to operate and program those machines. Even though I’d like to see computers get easier to operate and program, I would still expect see a demand for humans to do increasingly complex work with them.

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E.O. Wilson Proposes New Theory of Social Evolution

  • Posted on August 29, 2010 at 12:14 pm

Ants

For decades, selflessness — as exhibited in eusocial insect colonies where workers sacrifice themselves for the greater good — has been explained in terms of genetic relatedness. Called kin selection, it was a neat solution to the conundrum of selflessness in what was supposedly an every-animal-for-itself evolutionary battle.

One early proponent was now-legendary Harvard biologist E.O. Wilson, a founder of modern sociobiology. Now Wilson is leading the counterattack. [...]

The researchers offer their own alternative theory, based on standard natural selection, but with a twist: After starting with a focus on a single founder, selection moves to the level of colony. From this perspective, a worker ant is something like a cell — part of a larger evolutionary unit, not a unit unto itself.

“Our model proves that looking at a worker ant and asking why it is altruistic is the wrong level of analysis,” said Tarnita. “The important unit is the colony.”

Wired Science: E.O. Wilson Proposes New Theory of Social Evolution

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Science without Purpose: Suppressing the Teleological Instinct

  • Posted on August 10, 2010 at 10:29 am

total solar eclipse

The teleological drive – the desire to not merely make, but rather to perceive inherent purpose in the world – influences a myriad of adult human behavior. Such behavior may range from conspiracy theories to abstract philosophical works, but even “scientists” may falter. [...]

Both Darwin and Freud introduced highly disconcerting models of thought for a world hitherto predicated on the teleological. The theory of evolution and the unconscious seemed to queer many of the most ingrained human conceptions of purpose and control. However, the drive toward Why Must!? is not easily banished, and rather than die out, it burrowed into the very concepts that threatened it. Little wonder then that many of us today conceive of evolution as Nature’s architect and regard the unconscious (our Id) as an insidious competitor-agent. In such a teleological worldview, emotions such as sadness are no longer random behavioral traits. Rather, they become adaptive instinct, forged by Nature to guide humanity and distinguish intuitively between right and wrong.

All good so far, but what’s this about?

Although the following statement risks being unscientific, what all the aforementioned seems to imply is that human beings have a strong teleological instinct, a propensity for asking Why? and Why Must!? Our obsession with perceiving (and thus ascribing) purpose most likely arose as an adaptive trait in an inter-human, social context. With such complex brains, humans are capable of countless emotional affections and a perhaps infinite array of varied behavior. To perceive someone teleologically is to see and comprehend his intent, his consciousness in relation to one’s own. The comprehension of intent offers security from the innumerable and seemingly purposeless actions humans may exhibit. On an anthropological level, teleology would seem to benefit the formation of complex, social structures, wherein the determination of purpose serves to regulate and maintain varied levels of production and class. The agency-attribution error supports the notion that teleology is an instinct “made” for humans, the only beings with an agenda, that is, capable of being purposeful agents. Both scientists and laymen would do well to remember the influence this artificial instinct has on thought and language. After all, if language-cognition arose under a teleological context (that is, a human-social context), all semantics must contain, invoke, and conceal a Why Must!?

Serendip: Science without Purpose: Suppressing the Teleological Instinct

Sure, it’s possible that there’s an evolutionary function of the teleological impulse (I’ll call it an impulse since we don’t know that it’s actually an instinct) – but we should remember that evolution only selects for “good enough,” not necessarily “optimal.” The teleological impulse may be a side effect of our ability to determine cause and effect (which does seem to serve an evolutionary function) and serve no actual function. We’ve made it this far with it, so it hasn’t been selected out – just like many other harmful human behaviors.

Photo by By Luc Viatour / CC

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From http://technoccult.net/archives/2010/08/10/teleological-instinct/

Tibetans May Represent Fastest Case of Human Evolution

  • Posted on July 2, 2010 at 5:30 pm

Tibetan monks

Tibetans live at altitudes of 13,000 feet, breathing air that has 40 percent less oxygen than is available at sea level, yet suffer very little mountain sickness. The reason, according to a team of biologists in China, is human evolution, in what may be the most recent and fastest instance detected so far. [...]

If confirmed, this would be the most recent known example of human evolutionary change. Until now, the most recent such change was the spread of lactose tolerance — the ability to digest milk in adulthood — among northern Europeans about 7,500 years ago. But archaeologists say that the Tibetan plateau was inhabited much earlier than 3,000 years ago and that the geneticists’ date is incorrect.

New York Times: Scientists Cite Fastest Case of Human Evolution

(Thanks David Forbes)

(Photo by waterwin / CC)

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From http://technoccult.net/archives/2010/07/02/tibetans-may-represent-fastest-case-of-human-evolution/