Tagevolution

E.O. Wilson Proposes New Theory of Social Evolution

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

Science without Purpose: Suppressing the Teleological Instinct

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

Tibetans May Represent Fastest Case of Human Evolution

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)

Scientists discover missing link in the emergence of life

inorganic life

Philosophers and scientists have argued about the origins of life from inorganic matter ever since Empedocles (430 B.C.) argued that every thing in the universe is made up of a combination of four eternal ‘elements’ or ‘roots of all’: earth, water, air, and fire, and that all change is explained by the arrangement and rearrangement of these four elements. Now, scientists have discovered that simple peptides can organize into bi-layer membranes. The finding suggests a “missing link” between the pre-biotic Earth’s chemical inventory and the organizational scaffolding essential to life.

Daily Galaxy: Scientists Discover Missing Link Between Organic and Inorganic Life

(Thanks Wade)

Possible New Human Ancestor Discovered

Australopithecus sediba skull

Two 1.9 million-year-old skeletons found in a South African cave have added a new and intriguing member to the primate family.

Dubbed Australopithecus sediba, it has many features — including long legs and a protruding nose — common to Homo, the genus that eventually spawned humans. Other features, such as extra-long forearms and flexible feet, date from deep in our primate past.

Paleontologists disagree over whether A. sediba is a direct human ancestor, or just looks like one. But whatever their lineage, the fossils provide rare insight into a period shrouded in paleontological mystery.

“We feel that A. sediba might be a Rosetta Stone for defining for the first time what the genus Homo is,” said paleontologist Lee Berger of the University of Witwatersrand. “They’re going to be a remarkable window, a time machine.”

Wired: Possible New Human Ancestor Discovered

More on the discovery: New York Times: New Hominid Species Discovered in South Africa

700-year-old Brain Found Preserved

700 year old preserved brain

ResearchBlogging.orgEvolutionary psychology tends to receive harsh criticism, and often rightly so. One of the main reasons for this is the severe lack of evidence for many of it’s proposals given that the paucity of fossilised brains fails to bolster many a case. And it isn’t even anyone’s fault. That’s just the way it goes sometimes, that the brain is a jelly-like substance that is subject to decay after death, and there’s no way we can objectively analyse or verify any differences in brains of long ago with brains of today.

This isn’t set to change anytime soon, but the remarkable discovery of a medieval child’s brain was the subject of a Neuroimage paper published recently. This is extremely exciting on many counts: the brain has been so fantastically preserved that it is possible to identify the frontal, temporal and occipital lobes, and even the sulci and gyri, the grooves and furrows channeled into brains.

However it is only the left-hemisphere that survived and not the entire brain, which had also shrunk to about 80% of it’s original weight due to the (natural) mummification process.

Neurowhoa: 700-year-old Brain Found Preserved

Neanderthals Not Dumb, but Made Dull Gadgets

blades and flakes

After analyzing tools used by Neanderthals, British and American archaeologists say they were just as well-crafted as those used by our ancestors.

Flakes — wide-bodied stones used for cutting by Neanderthals and Homo sapiens — are just as useful, if not moreso, than narrow stone blades later favored by modern humans, who charged out of Africa 50,000 years ago and soon replaced their larger, hairier European forerunners.

“It’s not a better technology, it’s just a different technology,” said Metin Eren, a University of Exeter experimental archaeology student. […]

The superiority of blades has long been seen as evidence of human superiority. But according to Eren’s team, blades had only one advantage: they can be easily attached to shafts.

Wired Science: Neanderthals Not Dumb, but Made Dull Gadgets

The Red Queen Theory confirmed – evolution is driven by interaction between species:

Red Queen

Scientists at the University of Liverpool have provided the first experimental evidence that shows that evolution is driven most powerfully by interactions between species, rather than adaptation to the environment.The team observed viruses as they evolved over hundreds of generations to infect bacteria. They found that when the bacteria could evolve defenses, the viruses evolved at a quicker rate and generated greater diversity, compared to situations where the bacteria were unable to adapt to the viral infection.

Read More – The “Red Queen Theory” -Scientists Find Driving Force Behind Evolution is Fight for Survival not Environment

(Thanks Paul)

Meteorite that crashed into Earth 40 years ago contains organic molecules

Murchison

Scientists say that a meteorite that crashed into Earth 40 years ago contains millions of different carbon-containing, or organic, molecules.

Although they are not a sign of life, such organic compounds are life’s building blocks, and are a sign of conditions in the early Solar System.

It is thought the Murchison meteorite could even be older than the Sun.

The results of the meteorite study are published in the Proceedings of the National Academy of Sciences.

Read More – BBC: Space rock contains organic molecular feast

See also: Professor claims life on earth came from space

(via Disinfo)

Professor claims life on earth came from space

chandra wickramasinge

New evidence from astrobiology “overwhelmingly” supports the view that life was seeded from outside Earth, a scientist has claimed.

Prof Chandra Wickramasinghe of Cardiff University says the first microbes were deposited on Earth 3,800m years ago.

The astrobiologist has helped developed the panspermia theory which suggests an extra-terrestrial origin for life.

He argues for a cycle of life as microbes find their way into comets and “multiply and seed other planets”.
In the article, published in the International Journal of Astrobiology, Monday, he argues humans and indeed all life on Earth is of alien origin, brought onto the planet by comets hitting the planet.

BBC: Professor’s alien life ‘seed’ theory claimed

(via HipGnosis)

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