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Neuroscience of Intelligence

Studies of twins show a strong genetic basis for differences in performance on psychometric measures of intelligence. Most estimates indicate 50 to 80 percent of the intelligence differences among people are due to heredity, with the highest heritability in older people. Since genes work through biology, there must be some biological basis to intelligence. Identifying the specific biological properties of the brain that are responsible for intelligence, however, has remained elusive. Once any brain property is found to be associated with intelligence, even if there is a strong genetic basis for the property, how that property develops and how it may be influenced by other biological and nonbiological factors are separate issues. An understanding of the neurobiological factors related to intelligence may have implications for ...

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