Navigation Links
Bigger brain size matters for intellectual ability

Brain size matters for intellectual ability and bigger is better, McMaster University researchers have found.

The study, led by neuroscientist Sandra Witelson, a professor in the Michael G. DeGroote School of Medicine, and published in the December issue of the journal Brain, has provided some of the clearest evidence on the underlying basis of differences in intelligence.

The study involved testing of intelligence in 100 neurologically normal, terminally ill volunteers, who agreed that their brains be measured after death.

It found bigger is better, but there are differences between women and men.

In women, verbal intelligence was clearly correlated with brain size, accounting for 36 percent of the verbal IQ score. In men, this was true for right-handers only, indicating that brain asymmetry is a factor in men.

Spatial intelligence was also correlated with brain size in women, but less strongly. In men, spatial ability was not related to overall brain size. These results suggest that women may use verbal strategies in spatial thinking, but that in men, verbal and spatial thinking are more distinct.

It may be that the size or structure of the localized brain regions which underlie spatial skills in men is related to spatial intelligence, as was shown in previous research in Witelson's lab on the brain of Albert Einstein.

In a further sex difference, brain size decreased with age in men over the age span of 25 to 80 years, but age hardly affected brain size in women. It is not known what protective factors, which could be genetic, hormonal or environmental, operate in women.

It remains to be determined what the contribution of nature and nurture are to this cerebral size relationship with intelligence, Witelson said. She added that the results point to the need for responsibility in considering the likely future use of magnetic imaging (or MRIs) of brain structure as a measure of ability in student an d workforce settings.

"We're going to need to be careful if, in the future, we use MRI brain scans as a measure of ability in any selection process," she said.


'"/>

Source:McMaster University


Related biology news :

1. Controversial drug shown to act on brain protein to cut alcohol use
2. Mouse brain cells rapidly recover after Alzheimers plaques are cleared
3. Mouse brain tumors mimic those in human genetic disorder
4. New imaging method gives early indication if brain cancer therapy is effective, U-M study shows
5. First atlas of key brain genes could speed research on cancer, neurological diseases
6. NYU study reveals how brains immune system fights viral encephalitis
7. Stem cells from brain transformed to produce insulin at Stanford
8. Birds brains reveal source of songs
9. Loves all in the brain: fMRI study shows strong, lateralized reward, not sex, drive
10. Revolutionary nanotechnology illuminates brain cells at work
11. A puzzle piece found in unraveling the wiring of the brain
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/22/2016)... 22, 2016 On Monday, the Department of ... to share solutions for the Biometric Exit Program. The ... Border Protection (CBP), explains that CBP intends to add ... the United States , in order to ... imposters. Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/20/2016)... 20, 2016 Securus Technologies, a leading ... for public safety, investigation, corrections and monitoring announced ... it has secured the final acceptance by all ... Managed Access Systems (MAS) installed. Furthermore, Securus will ... be installed by October, 2016. MAS distinguishes between ...
(Date:6/15/2016)... June 15, 2016 Transparency ... titled "Gesture Recognition Market by Application Market - Global Industry Analysis ... 2024". According to the report, the  global gesture recognition ... 2015 and is estimated to grow at a ... by 2024.  Increasing application of gesture ...
Breaking Biology News(10 mins):
(Date:11/30/2016)... The global Pyrogen Testing Market ... dominant share in the overall market. The leading players, ... Merck KGaA, held a lion,s share of 51% in ... that these companies are expected to retain their leadership ... do not require rabbit pyrogen testing along with strategic ...
(Date:11/30/2016)... , Nov. 30, 2016  The Allen ... Cell Collection: the first publicly available collection of ... cells that target key cellular structures with unprecedented ... Research, these powerful tools are a crucial first ... to better understand what makes human cells healthy ...
(Date:11/30/2016)... SAN DIEGO and BEIJING ... Ltd., a leading commercial provider of genomic services and ... expertise, announced today that it has completed a USD ... China Merchants Bank Co., Ltd.,s CMB International Capital Management ... SDIC Innovation Investment Management Co., Ltd. ("SDIC Innovation") and ...
(Date:11/30/2016)... Mass. , Nov. 30, 2016   Merck ... that it has entered into a set of agreements ... services for Merck,s collection of genetic reagents such as ... with Evotec,s screening expertise offers an accelerated pathway to ... discovery starts with the identification of new targets, a ...
Breaking Biology Technology: