Genetic Influences

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Genetic influences seem to be the most prominent factor after continuity in general cognitive ability. Shared environmental influences are not only responsible for stability but also change in the development of cognitive abilities as well. Bartels et al. (2002) showed significant heritability at all ages, with the predicted increment of genetic stimuli and the reduction of shared environmental stimuli throughout the years.

The heritability of intelligence increases about 60% from infancy to later adulthood. Plomin and Deary (2014) suggested that intelligence captures genetic effects on diverse cognitive and learning abilities, which correlate phenotypically about 30% on average but correlate genetically about 60% or more. Intelligence is