Re: brain development--one more try
Thu, 9 Feb 1995 12:02:07 -0600
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Date: Mon, 06 Feb 1995 18:27:09 -0600 (CST)
Subject: Re: Brain Development
Sender: JAMES BENTHALL <ST26H@Jetson.UH.EDU>
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[sorry to be unable to include previous posts that I am responding to]
The climatic changes that William Calvin refers to most certainly did have
an effect on the continent of Africa. Water became trapped in extensive ice
sheets, thus causing sea levels to drop precipitously and subverting the rain
cycle. Large expanses of Africa became bone dry, leading to the emergent of
the savannas. What Calvin asserts (and it has been years since I read his
book) is that the environment changed precipitously *each time* the ice sheets
advanced and retreated. The combined effect of these fairly abrupt changes over
a course of several million years led to the jump in encephalization.
Btw, this does not posit a cold/intelligence relationship but rather a harsh
environment/intelligence relation. Making a living in a dry environ seems to
me a more difficult task than in an equitorial zone that is drenched.
Don't mean to give short shrift to this topic but I have no time and I cannot