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:12/7/2016)... ... ... A. Kevin Spann Insurance, a New York-based firm offering insurance and financial consultation ... drive to raise funds that will benefit the Marine Corps League. , The Marine ... Corpsmen. Working closely with the MCL, the A. Kevin Spann team plans to generate ...
(Date:12/7/2016)... ... December 07, 2016 , ... The Honolulu cosmetic and ... website, which launched October 17, 2016, features comprehensive information regarding a wide range ... Visitors and patients can discover the latest clinical dermatology treatments for medical skin ...
(Date:12/7/2016)... ... 07, 2016 , ... Texas Premier Locksmith , a ... by unethical locksmith companies and is urging Search Engines to improve verification methods ... Premier Locksmith, these fraudulent locksmith services take advantage of consumers locked out of ...
(Date:12/7/2016)... ... , ... "ProBrand Flip allows FCPX editors to create unique logo reveals which ... Pixel Film Studios. , ProBrand Flip includes 30 flip book reveal animations. Easily reveal ... a variety of flip book animations. In Addition, users can modify each preset to ...
(Date:12/7/2016)... ... December 07, 2016 , ... Maureen McLaughlin, ... at Reproductive Medicine Associates of Connecticut (RMACT). McLaughlin brings nearly 20 years of ... acupuncturists to help patients realize their family building goals. Acupuncture helps fertility ...
Breaking Medicine News(10 mins):
(Date:12/7/2016)... -- "Lantus (Insulin Glargine) Biosimilar Clinical Trial & Opportunity Insight" report by ... drug in clinical pipeline. Currently 5 biosimilar version of Lantus are commercially ... Kenya , Czech Republic , ... , Slovakia , United Kingdom ... patent on Lantus expired in 2014. Lantus is the brand name ...
(Date:12/7/2016)... YORK , Dec. 7, 2016 Global ... This report on the global hospital linen supply and ... of this market on a global and regional level. ... forecast for the period between 2015 and 2024 based ... the dynamics of the market along with their impact ...
(Date:12/7/2016)... -- REPORT OBJECTIVES The report "SPF ... on a market segment, based on geography. Market ... the report. The primary objectives of this report ... through detailed segmentation, 2) market size and forecasts, ... market situation, trends, 3) detailed analysis of current ...
Breaking Medicine Technology: