From: Keith Henson (firstname.lastname@example.org)
Date: Mon 27 Oct 2003 - 14:44:45 GMT
At 09:38 AM 27/10/03 +0000, you wrote:
> --- Keith Henson <email@example.com> wrote: > At
> > Calvin argues that the final 2 fold expansion of the
> > brain was largely
> > driven by the human line moving into areas where
> > accurate projectile
> > hunting was the only way to get through the winter.
> > Lots about "glacial
> > pumping" in _Ascent of Mind._
>I can see how that might work, but doesn't the
>palaeontological record suggest that the final
>transition from archaic H. sapiens to H. sapiens
>sapiens occurred about 135,000 bp, and therefore
>_before_ the migration to the glacial north?
The human line's expansion into the north is (if I remember correctly) at
least 800,000 years back. They were expanding into big game areas.
Calvin discusses the temporal link here going back 2.5 million years or
so. It is not entirely clear cut but reasonably sound.
This is a link the entire contents of _Ascent of Mind._ I really have to
get another paper copy. I gave my copy to Richard Dawkins as an example of
excellent work congruent with his when Calvin's book was briefly out of print.
"Yet we humans thrive on such challenges: the fickle climate seems to have
pumped up our brain fourfold larger than the ape-sized brain -- and that
was all walking-upright hominids had, back before the ice ages started 2.5
million years ago. A key aspect of the pump: massive ice sheets create
unusual population booms when they melt."
"Population booms on the frontier when ice melts back cause the
frontier-type prehumans to become dominant. But the ice again advances,
pushing the new population south, into competition and interbreeding with
tropical hominids. In this way, a minority becomes a majority. This
demographic pump spreads essential-in-winter genes, such as those
facilitating hunting and fire-making, around the tropics."
>I haven't read that book by Calvin, so perhaps he has
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>This was distributed via the memetics list associated with the
>Journal of Memetics - Evolutionary Models of Information Transmission
>For information about the journal and the list (e.g. unsubscribing)
This was distributed via the memetics list associated with the
Journal of Memetics - Evolutionary Models of Information Transmission
For information about the journal and the list (e.g. unsubscribing)
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