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A bold new theory on what sparked the "big bang" of human counsciousness
The abrupt emergence of human culture over a stunningly short period continues to be one of the great enigmas of human evolution. This compelling book introduces a bold new theory on this unsolved mystery. Author Richard Klein reexamines the archaeological evidence and brings in new discoveries in the study of the human brain. These studies detail the changes that enabled humans to think and behave in far more sophisticated ways than before, resulting in the incredibly rapid evolution of new skills. Richard Klein has been described as "the premier anthropologist in the country today" by Evolutionary Anthropology. Here, he and coauthor Blake Edgar shed new light on the full story of a truly fascinating period of evolution.
Richard G. Klein, PhD (Palo Alto, CA), is a Professor of Anthropology at Stanford University. He is the author of the definitive academic book on the subject of the origins of human culture, The Human Career. Blake Edgar (San Francisco, CA) is the coauthor of the very successful From Lucy to Language, with Dr. Donald Johanson. He has written extensively for Discover, GEO, and numerous other magazines.
288 pages, Hardcover
First published March 1, 2002
"Rather than accept the obvious – that human culture feeds into itself, thus generating its own accelerating tempo – many anthropologists, archaeologists, and linguists believe that something ‘genetic’ happened to the way our brains worked within the last 100,000 years, producing a different kind of human brain with new wiring. Some go even further, suggesting that language is the most obvious candidate for that new and unique behaviour. Frankly, I think this is perverse logic and un-Darwinian. Deliberate coded communication, or ‘language’, is certainly a useful, new, and unique behaviour. How much simpler, though, if this was what had differentiated our early ancestors from other large savannah primates and had driven evolution of their brain size 2.5 million years earlier so that they could communicate better and cope with their worsening environment in a more inventive way... The European Upper Palaeolithic has been glorified as the ‘human revolution’, with dramatic cognitive advances such as abstract thought and speech. Often explicit in this scenario is the concept of a biological advance: the idea that a genetically determined change – a thought or speech gene – somehow brought about the Upper Palaeolithic revolution in Europe. Many of the most dramatic innovations of the modern newcomers were, however, just that: new inventions that had a clear regional and chronological beginning long after our species’ emergence...
Chicago palaeoanthropologist Richard Klein, takes this cultural explosion a stage further and interpret it as a human biological epiphany. In a standard text, The Human Career, written in 1989, he states: ‘it can be argued that the Upper Paleolithic signals the most fundamental change in human behavior that the archeological record may ever reveal . . . The strong correlation between Upper Paleolithic artifacts and modern human remains further suggests that it was the modern human physical type that made the Upper Paleolithic (and all subsequent cultural developments) possible. The question then arises whether there is a detectable link between the evolution of modern people and the development of those behavioral traits that mark the Upper Paleolithic.’ He then draws attention to the mainly Middle Palaeolithic tools of earlier modern humans, concluding: ‘In sum, anatomical and behavioral modernity may have appeared simultaneously in Europe, but in both the Near East and Africa, anatomical modernity antedates behavioral modernity, at least as it is detectable in the archeological record. This observation is difficult to explain. Perhaps . . . the earliest anatomically modern humans of Africa and the Near East were not as modern as their skeletons suggest. Neurologically, they may have lacked the fully modern capacity for culture. This may have appeared only as recently as 40,000 to 50,000 years ago when it allowed [what were by] then fully modern humans to spread rapidly throughout the world.’...
This model was conceived before 1989, at a time when it was believed that Australia was colonized only 40,000 years ago. In other words, Klein could interpret the evidence to allow for Australia – and hence also Asia – to have been colonized by Anatomically Modern Humans only after the start of the European Upper Palaeolithic. This made it possible for him to argue that these new ‘neurally enhanced’ moderns in Europe could have then moved on to colonize the rest of the non-African world. Klein published a second edition of his book in 1999, by which time he acknowledged, on the last couple of pages, the problem of possible earlier Australian (and Asian) colonization by 60,000 years ago, and the possibility of harpoon fishing in Africa between 90,000 and 155,000 years ago. In his conclusions he still, however, returns to the argument of a neurological evolutionary (i.e. genetically driven) revolution in Europe 40,000–60,000 years ago.
Even before we consider the evidence, we can see that this argument implies a biologically deterministic approach to cultural evolution. It assumes that each cultural advance is determined or ‘allowed’ by a genetic change. As I mentioned in the Prologue, human (or other primate) culture is first invented, then learnt and added to from generation to generation. Each advance or skill does not come out of a new gene. Rather, new behaviours come first and the genetic modifications that best exploit those new behaviours come afterwards. In other words, the change of culture precedes the change of body – not the other way round. Furthermore, there are predictable geographical differences of culture. If a particular invention in one region led to other local inventions, the accelerated pace of innovation would give that region a head start. So regional differences in the rate of cultural progression should be expected, even within one human species.
There are several inescapable logical assumptions in Klein’s argument that fully ‘neurally modern’ humans appeared only after 40,000–50,000 years ago. First there is the explicit implication that early African moderns were biologically less than modern – in other words, they did not have the neurological capacity to develop modern behaviours. This strange conclusion would inevitably apply to those moderns left in Africa, and also to the first moderns migrating into Asia and on to Australia, since it is now generally accepted that these colonizations took place quite some time before 50,000 years ago (the earliest possible time for which the Upper Palaeolithic can be identified in the Eastern Mediterranean). What do these hypothetical conclusions mean? They would mean first that the direct ancestors of today’s Africans living between 50,000 and 130,000 years ago were biologically incapable of developing or using Upper Palaeolithic behaviour and technology. They would not be able to paint, carve, trade, organize, and so forth. Many say that they could not speak – or, if they could, that their speech was ‘primitive’. With such disadvantages, presumably they could not, given the opportunity, drive cars or fly planes; compose and play soul, spirituals, reggae, classical music, and jazz; or become doctors, financiers, and geneticists. The mitochondrial DNA and Y-chromosome trees imply that today’s Africans are descended mainly from lines present before 50,000 years ago and not from lines outside Africa. So, why can today’s African descendants do all these things their ancestors were supposedly genetically incapable of?
There is a further logical problem. If Europeans were the first biologically modern humans and were isolated comparative latecomers, what about the rest of the world? How did they catch up? All living modern humans are fully ‘Anatomically Modern’, and we can trace back our genetic trail to a small ancestral group that started branching in Africa around 190,000 years ago. At no point after that did the total modern population number less than a thousand, so we have to imagine that one group inevitably led, by expansion and branching, to many groups… So if there really was, say, a ‘painting mutation’ or a ‘speech mutation’, only those descended from the individual who developed that mutation should inherit the skill. So, if the ‘behaviourally fully modern’ cluster of mutations initially evolved locally in Europeans 40,000–50,000 years ago, then the rest of the colonized world – the Asians, Africans, and Australians – would not be able to paint, carve, speak, make blades, or place a bet on a horse. Nor would their modern descendants. This is clearly absurd, for they can do all those things."