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Why Do IQ Scores Vary By Nation?
Newsweek ^ | July 26, 2010 | Katie Baker

Posted on 07/27/2010 5:52:56 PM PDT by reaganaut1

Global differences in intelligence is a sensitive topic, long fraught with controversy and still tinged by the disgraceful taint of pseudosciences such as craniometry that strove to prove the white “race” as the most clever of them all. But recent data, perplexingly, has indeed shown cognitive ability to be higher in some countries than in others. What’s more, IQ scores have risen as nations develop—a phenomenon known as the “Flynn effect.” Many causes have been proposed for both the intelligence gap and the Flynn effect, including education, income, and even nonagricultural labor. Now, a new study from researchers at the University of New Mexico offers another intriguing theory: intelligence may be linked to infectious-disease rates.

The brain, say author Christopher Eppig and his colleagues, is the “most costly organ in the human body.” Brainpower gobbles up close to 90 percent of a newborn’s energy. It stands to reason, then, that if something interferes with energy intake while the brain is growing, the impact could be serious and longlasting. And for vast swaths of the globe, the biggest threat to a child’s body—and hence brain—is parasitic infection. These illnesses threaten brain development in several ways. They can directly attack live tissue, which the body must then strain to replace. They can invade the digestive tract and block nutritional uptake. They can hijack the body’s cells for their own reproduction. And then there’s the energy diverted to the immune system to fight the infection. Out of all the parasites, the diarrheal ones may be the gravest threat—they can prevent the body from getting any nutrients at all.

(Excerpt) Read more at newsweek.com ...


TOPICS: Culture/Society
KEYWORDS: bellcurve; iq
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The relevance of this for public policy is that our legal immigration system prioritizing family ties (and the illegal one importing the dregs of Mexico and Central America) is reducing the average national IQ.
1 posted on 07/27/2010 5:52:57 PM PDT by reaganaut1
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To: reaganaut1

Read

“Understanding Human History”

which answers the question in 384 pages.

http://www.amazon.com/Understanding-Human-History-Michael-Hart/dp/1593680260


2 posted on 07/27/2010 5:57:21 PM PDT by DontTreadOnMe2009 (So stop treading on me already!)
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To: reaganaut1

The IQ system isn’t very accurate, when it doesn’t take into account how some people, with a very high IQ, are, also, very stupid and/or ignorant, when it comes to political ideology!


3 posted on 07/27/2010 5:57:38 PM PDT by johnthebaptistmoore (If leftist legislation that's already in place really can't be ended by non-leftists, then what?)
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To: DontTreadOnMe2009

By Mike Berman (New York City) - See all my reviews

This review is from: Understanding Human History (Perfect Paperback)
Here is a remarkable achievement. History books which answer the questions as to “when” and “where” are a dime a dozen. Some wars and some inventions, I guess you know them well. What Michael Hart has done in this masterpiece of a grand history lesson is to explain to his readers the great “whys” of history and pre-history.

Why did men start speaking with each other at a certain time and place? And why is it that agriculture first appeared where and when it did? Similarly, why did men develop the ability to write in the period and area they did? Dr. Hart’s transgressive answers to these questions will not please the faint of heart and the politically correct. Not only are the plants, animals and climate of each population’s habitat examined, but their cognitive abilities are taken into full account as well.

Understanding Human History is for readers who must know the truth, no matter where it will lead them. If a superior IQ was as powerful a prerequisite for the development of the Industrial Revolution as any other factor, then so be it. Few men would be up to the monumental task of making the case presented in these pages because it requires such a vast knowledge of history and science as well as the courage to break the most oppressive taboo of our time. In a sane world, this would be a required text for college students of world history.


4 posted on 07/27/2010 5:59:22 PM PDT by DontTreadOnMe2009 (So stop treading on me already!)
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To: reaganaut1
"Why Do IQ Scores Vary By Nation?"

Because some countries are below normal?

5 posted on 07/27/2010 6:00:09 PM PDT by Paladin2
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To: reaganaut1

Are You Smarter Than a Fifth Grader?
Self-identified liberals and Democrats do badly on questions of basic economics.

http://online.wsj.com/article/NA_WSJ_PUB:SB10001424052748703561604575282190930932412.html


6 posted on 07/27/2010 6:01:30 PM PDT by fight_truth_decay
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To: reaganaut1

and we would believe these “scores” why?


7 posted on 07/27/2010 6:02:25 PM PDT by GeronL (http://libertyfic.proboards.com <--- My Fiction/ Science Fiction Board)
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To: DontTreadOnMe2009

http://www.flipkart.com/guns-germs-steel-jared-diamond-book-0099302780


8 posted on 07/27/2010 6:02:31 PM PDT by Paladin2
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To: reaganaut1
Everybody knows all groups should have equal outcomes. This is a travesty, I say. IQ must be distributed equitably.
9 posted on 07/27/2010 6:04:07 PM PDT by RegulatorCountry
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To: reaganaut1

/


10 posted on 07/27/2010 6:05:07 PM PDT by dennisw (Sarah Mclachlan in 2012)
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To: reaganaut1
However, with the exception of this last theory—which has in any case been challenged—it turns out that “infectious disease remains the most powerful predictor of average national IQ.

What if some populations are more susceptible to infection than others? There is certainly evidence that points in this direction. In this event, the presence of infection might be primarily a marker for some other characteristic that is really the most significant factor.

That said, I dont want to dismiss the findings either. I do think there could be some impact of infection on cognitive development, just not as much as the authors seems to have convinced themselves.

11 posted on 07/27/2010 6:10:41 PM PDT by freespirited (There are a lot of bad Republicans but there are no good Democrats.--Ann Coulter)
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To: reaganaut1
/

The relevance of this for public policy is that our legal immigration system prioritizing family ties (and the illegal one importing the dregs of Mexico and Central America) is reducing the average national IQ.

That's a pretty stark assessment but Canada and Australia agree with you. Their immigration policies are skills based and also English literacy based. While we kow tow to minority groups and go by family reunification mostly, not by skills. Our legal immigration policy allows in poor people who are connected (have family here) ahead of skilled and educated people. Thus Mexico sends us the most legal immigrants about 400,000 per year

Canada has done an assessment of how previous immigrants and their offspring have done in Canada. They have applied the results to the current immigration policies in this way. More Chinese and Indian immigrants now and fewer Caribbean immigrants. Those racist basturds of the frozen north!!!!!!!1111!!

12 posted on 07/27/2010 6:11:02 PM PDT by dennisw (Sarah Mclachlan in 2012)
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To: johnthebaptistmoore

Potential causes for better IQ with development:
1. better food distribution, especially for the poor - growing brains require lots of calories, and if you’re starving, the brain doesn’t grow
2. better nutrition - if the kids get adequate vitamins, many nutritional deficiencies that reduce IQ go away
3. more vaccinations, more antibiotics - preventing diseases that destroy the brain helps boost IQ. Many fevers could cause blindness, deafness and paralysis. Many “unaffected” survivors likely lost some IQ points.
4. increased development tends to lead to better education - and more educated mothers teach more to very young children before they even hit school, helping wire the brain for better performance later.


13 posted on 07/27/2010 6:12:01 PM PDT by tbw2 (Freeper sci-fi - "Sirat: Through the Fires of Hell" - on amazon.com)
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To: reaganaut1
The countries with the lowest average IQ scores—Equatorial Guinea, Cameroon, Mozambique, Gabon—have among the highest disease burdens. In contrast, nations with low disease burdens top the IQ list, with Singapore, South Korea, China, Japan, and Italy in the lead.

The study controlled for other potential causes of the IQ gap... it turns out that “infectious disease remains the most powerful predictor of average national IQ.” The study’s findings may also help explain the Flynn effect, which can’t be accounted for by evolution (the IQ gains occur over time spans too short for natural selection). So what’s going on instead? As nations develop, they improve their population’s access to safe drinking water and to vaccines and medicine—all of which lower parasitic infection rates.

14 posted on 07/27/2010 6:13:36 PM PDT by iowamark
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To: Paladin2

What was the rest of the world doing when western civilization had its quantum leap of the industrial revolution?

Hey! Obama, tell us of the advances of Islam in ideas, inventions, innovation...other than advances in their warring state of mind...


15 posted on 07/27/2010 6:14:00 PM PDT by himno hero
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To: DontTreadOnMe2009

>> the courage to break the most oppressive taboo of our time.

IQ, religion, sexuality?


16 posted on 07/27/2010 6:23:31 PM PDT by Gene Eric (Your Hope has been redistributed. Here's your Change.)
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To: reaganaut1
High IQ’s do not guarantee success in life or even happiness.
17 posted on 07/27/2010 6:24:45 PM PDT by fight_truth_decay
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To: himno hero

Islam is/was fairly successful in spreading the word.


18 posted on 07/27/2010 6:26:32 PM PDT by Paladin2
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To: tbw2
5. Raw genetics

6. Social cultural wisdom on facilitation of infant/toddler mental development.

19 posted on 07/27/2010 6:28:43 PM PDT by Paladin2
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To: iowamark
"all of which lower parasitic infection rates. "

Doesn't the 'rat culture in the US facilitate parasite development?

20 posted on 07/27/2010 6:30:11 PM PDT by Paladin2
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