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Topic: Link: Is your mind changing? Scientists think so! (Read 973 times) |
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Drakeo Vortex
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RE: virus: Link: Is your mind changing? Scientists think so!
« Reply #1 on: 2005-09-11 05:02:02 » |
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Could these types of discoveries totally discredit jared diamonds germs,
guns, and steel. What if genetics was somewhat responsible. Say tribe one
has an average height of 5'6 and tribe two 5'10 that because tribe two
killed all of tribe one people do to larger size it was because of geologic
and climatic conditions. Possibly it could of been do to difference in diet
but there is an equal possibility, genetics. Tribe two had genes for taller
people. Are we trying to force reality on to political correctness? after i
read jared diamonds book that's why i though he got the awards for the book,
because it fit the political correct fairy tale. When kids are growing up
you hear all the time about some kids natural ability to learn or thier
ability in a specific class to out do everyone else. I here people all the
time say they are not smart enought or do this or that. In science at the
present time is saying all human brains are equal ..... (with a wisper in
the background) until we find out all the genes that make them different.
Why is everyone pretending like the truth is going to hurt. It's the truth.
It is what it is. If i happen to not have this one gene that helps humans be
smarter so be it. Until we really know...we won't know.
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simul
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I am a lama.
 
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Re: virus: Link: Is your mind changing? Scientists think so! (META)
« Reply #2 on: 2005-09-11 12:00:39 » |
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> I found this and thought some of
> you might find this to be interesting:
> http://www.theglobeandmail.com/
> servlet/ArticleNews/TPStory/
> LAC/20050909/BRAIN09/TPScience
Great article. I often think brain size is an interesting mutation. (Irish kids have huge heads)
I always apprectiate it when the first couple paragraphs are pasted into the post. Click to read more. Better for context.
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First, read Bruce Sterling's "Distraction", and then read http://electionmethods.org.
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rhinoceros
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Re: virus: Link: Is your mind changing? Scientists think so!
« Reply #3 on: 2005-09-11 09:26:18 » |
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http://www.rednova.com/news/science/234594/researchers_find_human_brain_is_still_evolving/
<snip>
The researchers emphasize that very little is known about the impact of
these variants. They may not have anything to do with cognition or
intelligence. "Just because these genes are still evolving, doesn't
necessarily mean they make you any smarter," Lahn said. "We've evolved
genes for selfishness, violence, cruelty--all of which are in place
because they may make survival easier. But in today's society, they're
certainly not condoned."
Lahn and colleagues stress these studies only examine two genes, and
that the genetic variations within a population are often almost as
great as the differences between groups. "If we look at multiple genes,
the ethnic variations--such as the ones we found--are likely to be
counterbalanced by other differences," Lahn said. "It just happens that
we looked at two genes for which the variants favored by selection have
a higher frequency in some populations, such as Europeans. It might be
that for the next two brain size genes we find, the variants favored by
selection will have a higher frequency in Asians or Africans."
Scientists know of about a half dozen other genes that are primarily
linked to brain size and several others that may also play a role in
regulating brain size. According to Lahn, these are all primary
candidates for learning more about human evolution.
<end snip>
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rhinoceros
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Re: virus: Link: Is your mind changing? Scientists think so!
« Reply #4 on: 2005-09-11 09:29:07 » |
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See also:
http://dienekes.blogspot.com/2005/09/stop-presses-huge-papers-on-brain.html
<snip>
Here is what these studies mean:
* Microcephalin and ASPM are genes involved in regulating brain size
* A variant of Microcephalin has reached very high frequencies in
non-Sub-Saharan Africans in the last 37,000 years.
* A variant of ASPM has reached very high frequencies especially in
Caucasoids but also in some southern Mongoloids and Australoids in the
last 5,800 years.
* It is almost inconceivable that these two factors were caused by
random factors (drift). Therefore selection has acted on these two
genes, favoring the new Microcephalin variant in non-Sub-Saharan
Africans and the ASPM especially in Caucasoids, but also to a lesser
extent in some southern Mongoloid and Australoid groups.
* We know absolutely nothing about what the new Microcephalin and
ASPM variants actually do. What we do know is that they confer some
substantial advantage that has caused them to grow in numbers. Perhaps,
they confer some cognitive or behavioral ability.
These are the facts. The interpretation of the facts must wait until we
have more information. However, the dates for the expansion of the two
variants are extremely suggestive.
<end snip>
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rhinoceros
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Re: virus: Link: Is your mind changing? Scientists think so!
« Reply #5 on: 2005-09-11 10:07:25 » |
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Nate Meme wrote:
> Could these types of discoveries totally discredit jared diamonds germs,
> guns, and steel. What if genetics was somewhat responsible. Say tribe
> one has an average height of 5'6 and tribe two 5'10 that because tribe
> two killed all of tribe one people do to larger size it was because of
> geologic and climatic conditions. Possibly it could of been do to
> difference in diet but there is an equal possibility, genetics. Tribe
> two had genes for taller people.
Just a comment not completely relevant to the main topic. Body height is
probably less gene-specified than brain size. The way the "height genes"
are expressed in the phenotype seems to have much to do with nutrition,
environment, social conditions... things which can change within just a
few generations. A bit too fast even for sexual selection.
The following article, which was found by Mermaid some time ago,
suggests that according to the data this actually happens: Heights do
change within a few generations in a given population.
The Height Gap
Why Europeans are getting taller and taller and Americans aren't.
http://www.newyorker.com/fact/content/?040405fa_fact
Generally, the way genes are expressed (produce proteins) is rarely
straightforward. The actual expression of a gene or gene combination is
affected by epigenetic and environmental factors. See also Matt Ridley's
"Nature via Nurture".
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