Causes of intelligence

Causes of intelligence research investigates the impact of various influences on intelligence, as measured by IQ test scores and other indicators of cognitive ability. The environment and its interaction with genes account for a high proportion of the variation in intelligence between individual young children, and for a small proportion of the variation observed in mature adults. Historically, there has been great interest in the field of intelligence research to determine environmental influences on the development of cognitive functioning, in particular, fluid intelligence, as defined by its stabilization at 16 years of age. Despite the fact that intelligence stabilizes in early adulthood it is thought that genetic factors come to play more of a role in our intelligence during middle and old age and that the importance of the environment dissipates.

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