Genetic and Environmental Influences in IQ

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IQ.jpgOne of the most interesting and controversial topics of psychology is the intelligence quotient and the influences that affects it. The intelligence quotient is a formula invented by Wilhem Stern that quantify difference among people and their intelligence. The formula consists in the mental age, that is the age corresponding to the average individual's performance of the test, divided by the chronological age, multiplied by 100.
A graphic of the results of these IQ tests form a bell curve almost a normal distribution with mean 100 and standard deviation of 15 points. Very few of the test takers with a result below 70 and above 130, defined as mental retardation to genius. These are the two extremes results. Now what influences these results? Only genetics? Environment?
Again the nature versus nurture is present here in the IQ topic. Investigations have found in twin studies that genetics influence IQ scores. Also in adoption studies found that adopted children's IQ score resemble their biological parent's IQ, both offering evidence that genetics influence IQ scores. On the other hand, it is known that education affects IQ. Children better educated will have a better IQ score. Also it is founded that children's IQ drops significantly on summer vacations.
Another factor that plays a key role in IQ, and in my opinion is very interesting, is the socioeconomic and nutritional deprivation. It's there that a reason to think that nutritional deprivation can adversely affect IQ. I am a track and field runner and found that African runners have a good group of distance runners. Studying about their training and environment I found that their nutrition consist mainly in corn and grains. That can be one of the major factors that cause their development in distance running. The same event can be occurring with IQ. Nutrition is very important. Some studies have found that children that were nutritionally deprived, increase their IQ when receiving a better nutrition.
In conclusion the factors that play the most important roles in IQ are genetics, nutrition and education among others.

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What evidence do you have for the statements you make? Where did you get the information (cite/link to sources)?

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This page contains a single entry by eduar005 published on November 20, 2011 8:40 PM.

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