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:7/21/2017)... ... , ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh in Abilene, Texas, has ... solve problems and pleads with world leaders to be more open about positive changes. Yisrayl ... He says there is a peaceful and positive way to solve all; yes, all issues, ...
(Date:7/21/2017)... ... July 21, 2017 , ... West Dermatology is pleased to announce the ... July 17, 2017, Ms. Vu will join West Dermatology’s large network of medical and ... skin cancer , and more. She graduated from the University of Florida College ...
(Date:7/20/2017)... ... July 20, 2017 , ... ChenMed , a leading provider of ... Senior Medical Center as Richmond Chief Medical Officer. Dr. McCarter, formerly Associate ... Chief Medical Officer of Ambulatory Services for the UVA Health System, brings 30 years ...
(Date:7/20/2017)... ... July 20, 2017 , ... Remote Medical Technologies (RMT) is ... included with each system installation. RMT’s iMedHD2™ Telepathology and ... collaboration and immediate decision-making requirements. While never sharing IP addresses, RMT has ...
(Date:7/20/2017)... , ... July 20, 2017 , ... ... **An FDAnews Webinar**, Aug. 9, 2017 — 1:30 p.m. – 3:00 p.m. ET, ... passing inspections and boosting quality. , It’s known as the “CY2016 Annual FDA ...
Breaking Medicine News(10 mins):
(Date:7/11/2017)...  The global market for liquid biopsy diagnostic and ... in 2016.  Although in early stages, the global market ... as a result of the gradual shift towards personalized ... of a significant number of new liquid biopsy tests ... biomarkers to guide treatment decisions. ...
(Date:7/10/2017)... , July 10, 2017  US medical equipment and ... 2021, according to Medical Equipment & Supplies: ... Freedonia Focus Reports. Continued increases in demand for medical ... of the population and supported by gains in disposable ... and supplies. New product introductions will also drive sales ...
(Date:7/10/2017)... TRIANGLE PARK, N.C. , July 10, 2017 /PRNewswire/ ... a $5m Convertible Note to support the development of ... by Tencent Holdings Limited, a leading Chinese Internet services ... This funding will advance multiple infectious disease product programs ... Founded by Dr. ...
Breaking Medicine Technology: