An average IQ is one hundred. Most people score between eighty-five and one hundred fifteen.
Ms. Galloway says students who attended school for nine years scored seven points higher than those who attended for seven years. Those who went for eight years scored about four points higher.
TARYN ANN GALLOWAY: "So that's still quite large."
Experts have debated for years about the extent to which people are born with intelligence or develop it later. This is the nature versus nurture argument -- the influence of biology compared to the environment in which people are raised and educated. This study seems to support the nurture side.
TARYN ANN GALLOWAY: "I think it’s because you do learn general thinking skills at school and you are able to practice them, and you have lots of opportunity to practice them. So this is a two year, you know, extension of compulsory schooling for two years, so they were able to simply improve their skills."
The findings appear in the Proceedings of the National Academy of Sciences.
Another recent study, in the journal Nature, found that IQ scores can rise or fall during the teenage years. In two thousand four, researchers from University College London tested thirty-three young people ages twelve to sixteen. They repeated the tests four years later. They found increases or decreases of as much as twenty points.
Both times, they also took structural brain scans using MRI, magnetic resonance imaging. The study found that as IQ scores increased, so did the density of gray matter in some areas of the students' brains.
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25