Re: Brain size, IQ

Gerold Firl (
14 Sep 1996 01:00:18 GMT

In article <516fcm$>, (HARRY R. ERWIN) writes:

|> Gerold Firl ( wrote:

|> : ...............................................Even if no large-scale
|> : migrations took place, genetic diffusion would suffice to spread novel
|> : genes and gene combinations among the old world hominids.

|> I've seen some similar studies, and the results are order of magnitude
|> correct. The gene flow is low enough that local populations can maintain
|> their local characteristics, but any truly advantageous combination of
|> genes can spread relatively rapidly.

Such a conclusion seems inescapible, making the current vogue for
extreme out-of-africa-ism somewhat puzzling. The hominid lineage
seems to have operated as a single breeding population since the days
of h. erectus.

|> It does suggest that the neanderthal
|> populations of western Eurasia were isolated for at least a while, since
|> male humans seem not be be fussy about who or what they have sex with.

I've noted the latter point, and the former is obvious, since
neandertals are such a cold-weather specialization, but what is the
connection between the two? Are you referring to the apparent lack of
intermediate forms when modern humans and neandertals coexisted?

A lot of modern europeans look pretty neandertalish; it seems to me
that I've run across a few intermediate forms.

|> The variation seen about 2 MYr BP in East Africa is very interesting in
|> this context.

At 2 M BP the australopithicines were still coexisting with genus homo,
right? Is that what you had in mind?

Disclaimer claims dat de claims claimed in dis are de claims of meself,
me, and me alone, so sue us god. I won't tell Bill & Dave if you won't.
=-=-=-=-=-=-=-=-=-=-=-=-=-=---- Gerold Firl @ ..hplabs!hp-sdd!geroldf