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Firstborn children have higher IQs



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momtomany




 
 
    
 

Post Mon, Jun 25 2007, 4:17 pm
Firstborn children have higher IQs
Quote:
THURSDAY, June 21 (HealthDay News) — First-born children possess IQs that are 2.3 points higher, on average, than their younger siblings, a new study contends.
This finding held true even when first-born children didn't survive and a younger child was reared as the eldest, scuttling the idea that genetics determines the difference in IQ among siblings, according to the Norwegian researchers who authored the report, published in the June 22 issue of the journal Science.

"This study really puts to an end a debate that's been going on for more than 70 years," said Frank J. Sulloway, a visiting scholar at the University of California, Berkeley, Institute of Personality and Social Research, and the author of an accompanying commentary in the journal. "The theory of biological differences is pretty much dead as a doornail."

While a 2.3 IQ point difference doesn't seem large, it translates into about a 30 percent increased chance of a child getting into an Ivy League university, Sulloway said.

However, study lead researcher Dr. Petter Kristensen, of the National Institute of Occupational Health in Oslo, noted that the difference in IQ doesn't predict what will happen to children in the future.

"This IQ difference has impact on educational potential on the population, giving first-born an advantage over later-born," he said. "However, on the individual level, this effect is so small that it gives little predictive power."

In the study, Kristensen and co-researcher Tor Bjerkedal, of the Institute of Epidemiology, Norwegian Armed Forces Medical Services, collected data on more than 241,000 male Norwegian draftees, 18 and 19 years old. The data included birth order, vital status of elder siblings, and IQ scores.

Kristensen and Bjerkedal found that the association between IQ and birth order wasn't genetic but rather related to the social birth order of the children.

"We provide evidence that suggests quite strongly that this effect is not an artifact, and that it is not linked to gestational factors — adverse pregnancy effects," Kristensen said.

"Indirectly, it supports the theory that social support and attention within the family explain the difference. First children will not have to share this attention at first. The more children, the less attention will be provided to each child if parental resources are limited," he added.

Sulloway noted that there are several theories that might explain the difference in IQ between first-born and younger siblings. Among these is one that says that more money is spent on the oldest child, and, as family size increases, less money is available for other children, leaving them with less opportunity. "But this doesn't intuitively strike me as the explanation," he said.

Another theory holds that the first-born child gets more of the parents' attention, but Sulloway also discounts this theory.

Still another explanation is that older children teach younger children, and the act of teaching raises the IQ. "The problem with this theory is that teaching has to raise the IQ of the first-born more than it does the IQ of younger siblings, in order to produce a birth order difference," he said.

A theory that Sulloway likes is called "niche partitioning." This theory suggests that once a role in the family is filled, others have to find roles that help them compete for attention in the family.

Sulloway noted that first-borns are judged to be more disciplined and more hard-working and more intelligent than their younger siblings. "The explanation for this is that first-borns occupy the role of a surrogate parent in the family," he said. "It is a great way to get brownie points from parents."

Because older children already occupy that niche in the family, younger children have to find other roles to play, Sulloway said. "So, younger siblings look for other things to be good at," he said. "It may be that that extra 2.3 points in IQ reflects an investment of time to get that, and the later-born is investing that time in something else and is getting 2.3 extra points in something else," he added.

Given that each child is finding his or her own niche, the difference in IQ is nothing for parents to worry about, Sulloway said.

what do you think?
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Ruchel




 
 
    
 

Post Mon, Jun 25 2007, 4:22 pm
Mmmm. I thought about parental attention too. I'm not sure I believe it though. I don't have many people to compare, I am only child, dh is only child, his parents and my dad are onlies. My mom has a higher iq than her big bro though.
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healthymama




 
 
    
 

Post Mon, Jun 25 2007, 4:49 pm
Quote:
While a 2.3 IQ point difference doesn't seem large, it translates into about a 30 percent increased chance of a child getting into an Ivy League university, Sulloway said.


I would like to see this explained.
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Motek




 
 
    
 

Post Mon, Jun 25 2007, 6:31 pm
2.3 points Confused

sounds negligible
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Ruchel




 
 
    
 

Post Mon, Jun 25 2007, 6:33 pm
totally negligible unless you need to be accepted in a place that only takes people with more than a certain iq.
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amother


 

Post Tue, Jun 26 2007, 5:42 am
I'm the second oldest in my family, and though we all have IQs within ten points of each other, I'm pretty sure I have the highest...
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amother


 

Post Tue, Jun 26 2007, 5:46 am
disagree. I'm the oldest and I don't think I have the highest iq from all my siblings
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chocolate moose




 
 
    
 

Post Tue, Jun 26 2007, 10:04 am
Could be. Firstborns get all kinds of good things......

It's what they DO with it that matters, though.
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Tefila




 
 
    
 

Post Tue, Jun 26 2007, 3:14 pm
It is a bubbe maaseh trust me .................. I know Twisted Evil
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amother


 

Post Fri, Sep 21 2007, 12:15 pm
Many us presidents were first born children
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happymom




 
 
    
 

Post Fri, Sep 21 2007, 12:55 pm
I think its because some people talk alot to thier oldest kid, give them alot of love, and spend alot of time with them MORE then the other kids.

BUT, if a mother spends tonz of time with the other kids, talks to them alot, teaches them alot, and has lots of patience with them too, I dont see why they wouldnt be just as smart as the older sibling.
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Emuna




 
 
    
 

Post Fri, Sep 21 2007, 1:19 pm
Maybe it depends on how many years the first is the only one. My mother was the first for five years and it made it huge difference. My husbands aunt is a first born for four years and she's definitely the highest IQ. But in families with one or two years difference between the first and second (like my husband - he's the first but only for one year) I doubt it's long enough to make a difference. Interesting article...
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chavamom




 
 
    
 

Post Fri, Sep 21 2007, 1:24 pm
amother wrote:
I'm the second oldest in my family, and though we all have IQs within ten points of each other, I'm pretty sure I have the highest...


I'm one of five children and the first 4 all have IQ's within a few points of one another. My youngest brother has a scary genius IQ. So we don't fit the study.
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mommyX2




 
 
    
 

Post Fri, Sep 21 2007, 1:36 pm
how does everyone know their IQ's?
are those tests online accurate?
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chavamom




 
 
    
 

Post Sat, Sep 22 2007, 9:12 pm
When we were younger and our parents were still in college, the kids in the family often served as guinea pigs for friends getting graduated degrees in educational psychology and the like. I'm not sure how many times I had my IQ tested, but it was more than a few.

Standardized achievement tests give an approximation, but it's not terribly accurate.

As to how accurate regular IQ tests are and what they actually show is a subject of great debate.
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Motek




 
 
    
 

Post Sun, Sep 23 2007, 5:52 pm
Nu, so what's your IQ chavamom? Wink
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chavamom




 
 
    
 

Post Sun, Sep 23 2007, 7:14 pm
IQ, sh-IQ, who holds of 'em anyway Wink . My brothers (the scary one) measures at 170. Mine is not nearly that high.
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