Navigation Links
Cortex Of Youth With Superior IQ Matures Fast

The thickening and thinning of the brain plays an important role in distinguishing the youth with highest IQ. // The researchers at the National Institutes of Health's (NIH) National Institute of Mental Health (NIMH) using magnetic resonance imaging (MRI) scans has found how the brain's outer layer, cortex, thickens, and will be at its peak, during the childhood stage, reflecting a high-level thinking circuitry. On the contrary it thins in the later teens due to unused neural connections as the brain restructures its operations.

"Studies of brains have taught us that people with higher IQs do not have larger brains. Thanks to brain imaging technology, we can now see that the difference may be in the way the brain develops," said NIH Director Elias A. Zerhouni, M.D.

While most previous MRI studies of brain development compared data from different children at different ages, the NIMH study sought to control for individual variation in brain structure by following the same 307 children and teens, ages 5-19, as they grew up. Most were scanned two or more times, at two-year intervals. The resulting scans were divided into three equal groups and analyzed based on IQ test scores: superior (121-145), high (109-120), and average (83-108).

The researchers found that the relationship between cortex thickness and IQ varied with age, particularly in the prefrontal cortex, seat of abstract reasoning, planning, and other "executive" functions. The smartest 7-year-olds tended to start out with a relatively thinner cortex that thickened rapidly, peaking by age 11 or 12 before thinning. In their peers with average IQ, an initially thicker cortex peaked by age 8, with gradual thinning thereafter. Those in the high range showed an intermediate trajectory (see below). While the cortex was thinning in all groups by the teen years, the superior group showed the highest rates of change.

"Brainy children are not cleverer solely by virtue of having more or less gray matter at any one age," explained Rapoport. "Rather, IQ is related to the dynamics of cortex maturation." The observed differences are consistent with findings from functional magnetic resonance imaging, showing that levels of activation in prefrontal areas correlates with IQ, note the researchers. They suggest that the prolonged thickening of prefrontal cortex in children with superior IQs might reflect an "extended critical period for development of high-level cognitive circuits." Although it's not known for certain what underlies the thinning phase, evidence suggests it likely reflects "use-it-or-lose-it" pruning of brain cells, neurons, and their connections as the brain matures and becomes more efficient during the teen years.

"People with very agile minds tend to have a very agile cortex," said Shaw. The NIMH researchers are following-up with a search for gene variants that might be linked to the newly discovered trajectories. However, Shaw notes mounting evidence suggesting that the effects of genes often depends on interactions with environmental events, so the determinants of intelligence will likely prove to be a very complex mix of nature and nurture.

--Eurekalert
'"/>




Related medicine news :

1. Chronic Facial Pain Tackled By Cortex Stimulation
2. Inadequate Drug Treatment For Youth
3. Canadian Youth at risk of heart disease
4. Youth Becoming Sexually Active At A Younger Age
5. Drug Use On The Decline Among US Youth
6. Youth Smoking Sparked By Multiple Factors: Study
7. Advertisements Prompt Youth To Drink
8. More Youth In Himachal Resort To Suicide
9. Youth is a blunder; manhood a struggle; old age a regret.
10. Coffee Bars: A Boon For Chinas Jobless Youths
11. Web Romance Is Catching Up Among The Youths In China
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/11/2016)... , ... February 11, 2016 , ... ... for nominations seeking candidates for the Board of Commissioners. Individuals interested in volunteer ... and experience with diversity of clinical practice settings and across allied health to ...
(Date:2/11/2016)... ... February 11, 2016 , ... Greenfield Insurance Group in Orange ... assist the people of their local community. The agency pledges to select a ... Their hope is to bring awareness to important local causes with fundraising and ...
(Date:2/11/2016)... ... 11, 2016 , ... Duterte Insurance Group, serving the families ... new charity campaign to raise funds for Ronald McDonald House Charities. On behalf ... . , Ronald McDonald House (RMH) is an internationally renowned nonprofit organization which ...
(Date:2/11/2016)... ... February 11, 2016 , ... Be Well Medical Group (Be ... of Old Town at 108 South Columbus St, Suite 201, Alexandria, VA. Be Well ... medical care in the convenience of their homes, offices or at the practices’ local ...
(Date:2/11/2016)... CO. (PRWEB) , ... February 11, 2016 , ... ... people have become more actively engaged in health and wellness best practices in ... importance of riding this trend. February is American Heart Month, which acts as ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... -- AfterPill.com is reporting that this week,s Centers for Disease ... who are at risk of unintended pregnancy impacts 43 ... the risks of unprotected sex in particular.  ... the Guttmacher Institute, there are 43 million women in ... have sex without the intention of becoming pregnant.  Despite ...
(Date:2/11/2016)... 11, 2016  Proliant Biologicals is proud to announce ... (BSA) manufacturing facility.  The facility is located on the ... in Feilding. Boone , Iowa.  ... duplicate the systems in the U.S. facility, with critical ... U.S. installations.  --> Boone ...
(Date:2/11/2016)... , Feb. 11, 2016 Brain Cancer ... treatment method at West Cancer Center . ... fields to inhibit cancer cell replication causing death of ... than a decade to show a significant extension in ... (GBM) patients. Currently, West Cancer Center is the only ...
Breaking Medicine Technology: