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From: dubois@uwmacc.UUCP (Paul DuBois)
Newsgroups: net.origins
Subject: Re: Beast of Burden
Message-ID: <977@uwmacc.UUCP>
Date: Thu, 25-Apr-85 13:32:16 EST
Article-I.D.: uwmacc.977
Posted: Thu Apr 25 13:32:16 1985
Date-Received: Sat, 27-Apr-85 02:59:42 EST
References: <948@uwmacc.UUCP> <491@cybvax0.UUCP>
Distribution: net
Organization: UW-Madison Primate Center
Lines: 24

>> [Paul DuBois] 
>> I didn't forget.  But just how likely does it seem to you that two
>> independent lines of development from a smooth-brained ancestor with no
>> convolutions, to two different animals with convolutions, will result
>> in EXACTLY the same number of fissures, and that all 14 will be in
>> corresponding locations?  I confess skepticism (that healthy quality so
>> highly touted).

> [Mike Huybensz]
> The neocortex of all mammals is convoluted.  Which smooth-brained ancestor
> are you talking about?  And what makes you think it was smooth brained?

A reasonable question.  The information comes from a study of
endocranial casts obtained from fossil skulls.  Early horses were
smooth-brained.  More information may be obtained from:

	Tilly Edinger, "Evolution of the Horse Brain".
	Geol Soc Amer Memoir, 25, 16 Feb 1948.

-- 
                                                                    |
Paul DuBois	{allegra,ihnp4,seismo}!uwvax!uwmacc!dubois        --+--
                                                                    |
"Danger signs, a creeping independence"                             |