• What is IQ  How it affects your brain?

    What is IQ How it affects your brain?

    IQ or intelligence quotient is a parameter that helps in determining the cognitive ability or intelligence level of an individual. There are many standardized tests that can be undertaken to ascertain the IQ of a person. Hundred is considered as a median score on a standardized scale of IQ test. People who score from 90-110 have average intelligence. People, with a score of 130 or above, are believed to have exceptional intelligence. Again, anyone below age 70 is considered to be mentally retarded. There is always a margin of plus/minus 5-10 in these scores.

    The human brain and IQ

    It is the human brain that gives individuals the better edge over other living organisms. The brain is the most complex and complicated organ in the human body. It is the place from where all the activities of the body are controlled. Intelligence, thought processes, cognitive abilities etc., are all controlled by the brain itself.

    The brain has many parts and each part carries out some significant function. The most important segments of the brain can be divided into 4 main parts – the cerebellum, the brainstem, the cerebrum (which is considered as the master brain) and the limbic system. Now every part of the brain does not impact the IQ. There is a specific region which accounts for the IQ level.

    Fluctuations in cortex width decide IQ levels in people

    As per reports from one of the renowned researchers at the National Institute of Mental Health in Bethesda, it has been proved that dynamics of cortex maturation decides the IQ of a person. In a comprehensive structural brain-scan study, it has been found that general intelligence in humans is influenced greatly by the amount of gray matter tissue, which is found in certain regions of the brain. The outer coat of the brain, the cortex shows clear signs of thickening during childhood years. However, during teens, the cortex starts thinning again. For instance, kids who are too smart at 7 years age will have a thin cortex, which will thicken fast and by 11-12, will get back to thinning. Children with average IQ have a completely thick cortex by the age of 8 years and will start thinning after that.  

    Difference in sex

    In men, the amount of the gray matter which is responsible for general intelligence is 6.5 times more than that of women. On the other hand, women have almost 10 times the amount of white matter, which is related to intelligence than men. While gray matter processes information in the brain, white matter is kind of a networking hub, which keeps connecting the information centers successfully. This is the reason why most men are good at analytical subjects like mathematics and women are better in assimilating and integrating information as needed in subjects like social science or language and so on.  In men, only the anterior cerebral area is directly linked to IQ; while in women's posterior and total cerebral areas are linked to IQ.

    Many people have misconceptions that greater the brain size and more the gray matter, higher is the IQ of the person. Many survey reports have proven this false. It has been seen that many people have a large brain size and abundant gray matter, but their IQ level is standard and nothing very high.

    • 26, Sep 2016
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