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A 2012 study based on a representative sample of twins from the United Kingdom, with longitudinal data on IQ from age two to age fourteen, did not find evidence for lower heritability in low-SES families. However, the study indicated that the effects of shared family environment on IQ were generally greater in low-SES families than in high-SES ...
Parental education level was used as a moderator for this study. It was found that verbal IQ was highly heritable among children whose parents had a higher level of education, by being similar to the earlier studies of Fischbein and Scarr-Salapatek, this adds support to the hypothesis of variance in IQ heritability at different levels of ...
The Genetic Studies of Genius, later known as the Terman Study of the Gifted, [1] is currently the oldest and longest-running longitudinal study in the field of psychology. It was begun by Lewis Terman at Stanford University in 1921 to examine the development and characteristics of gifted children into adulthood.
Hereditarians point to the heritability of cognitive ability, and the outsized influence that cognitive ability has on life outcomes, as evidence in favor of the hereditarian viewpoint. [4] According to Plomin and Van Stumm (2018), "Intelligence is highly heritable and predicts important educational, occupational and health outcomes better than ...
Heritability can also change as a result of changes in the environment, migration, inbreeding, or how heritability itself is measured in the population under study. [9] The heritability of a trait should not be interpreted as a measure of the extent to which said trait is genetically determined in an individual. [10] [11]
A heritability of 1 indicates that variation correlates fully with genetic variation and a heritability of 0 indicates that there is no correlation between the trait and genes at all. In psychological testing, heritability tends to be understood as the degree of correlation between the results of a test taker and those of their biological parents.
These studies attempt to determine to what degree genes have a role in medical and psychological outcomes, such as personality or heritability of IQ. [2] One of Bouchard's case studies was Jim Springer and Jim Lewis (so-called Jim twins), twins who had been separated from birth and were reunited at age 39. [2]
Hereditary Genius: An Inquiry Into Its Laws and Consequences is a book by Francis Galton about the genetic inheritance of intelligence.It was first published in 1869 by Macmillan Publishers. [1]