I review representative biometric studies of adult twins and adoptees that have been used to generate estimates of genetic and environmental influence on intelligence (IQ) and special mental abilities. The various studies converge on a heritability estimate between 0.60 and 0.80 for IQ. Estimates of common environmental influence from the same studies are near zero. Studies of twins reared together and studies of unrelated individuals reared together yield sizable estimates of common family environmental influence in childhood but also demonstrate that this influence dissipates with age and approaches zero in adulthood. Twin studies of the major special mental abilities (verbal, spatial, perceptual speed and accuracy, memory) yield heritabi...
Abstract Although much genetic research has addressed normal variation in intelligence, little is kn...
ABSTRACT—Research on twins and unrelated persons liv-ing together indicates that, although differenc...
Differences in heritability and shared environmentality across levels of cognitive ability were asse...
I review representative biometric studies of adult twins and adoptees that have been used to generat...
Measures of intelligence were collected in 209 twin pairs at 5, 7, 10, and 12 years of age, as part ...
Self-perceived abilities (SPA), which play an important role in academic achievement, have been rece...
Self-perceived abilities (SPA), which play an important role in academic achievement, have been rece...
Biometrical analyses have concluded that high IQ, at least given a relatively unrestrictive definiti...
Heritability estimates of general intelligence in adulthood generally range from 75 to 85%, with all...
In this paper we assess the presence of assortative mating, gene-environment interaction and the her...
In this paper we assess the presence of assortative mating, gene¿environment interaction and the her...
Heritability estimates of general intelligence in adulthood generally range from 75 to 85%, with all...
Although much genetic research has addressed normal variation in intelligence, little is known about...
The genetic and environmental trends in IQ development were assessed in 483 same-sex twin pairs in t...
Heritability estimates of general intelligence inadulthood generally range from 75 to 85%, with all ...
Abstract Although much genetic research has addressed normal variation in intelligence, little is kn...
ABSTRACT—Research on twins and unrelated persons liv-ing together indicates that, although differenc...
Differences in heritability and shared environmentality across levels of cognitive ability were asse...
I review representative biometric studies of adult twins and adoptees that have been used to generat...
Measures of intelligence were collected in 209 twin pairs at 5, 7, 10, and 12 years of age, as part ...
Self-perceived abilities (SPA), which play an important role in academic achievement, have been rece...
Self-perceived abilities (SPA), which play an important role in academic achievement, have been rece...
Biometrical analyses have concluded that high IQ, at least given a relatively unrestrictive definiti...
Heritability estimates of general intelligence in adulthood generally range from 75 to 85%, with all...
In this paper we assess the presence of assortative mating, gene-environment interaction and the her...
In this paper we assess the presence of assortative mating, gene¿environment interaction and the her...
Heritability estimates of general intelligence in adulthood generally range from 75 to 85%, with all...
Although much genetic research has addressed normal variation in intelligence, little is known about...
The genetic and environmental trends in IQ development were assessed in 483 same-sex twin pairs in t...
Heritability estimates of general intelligence inadulthood generally range from 75 to 85%, with all ...
Abstract Although much genetic research has addressed normal variation in intelligence, little is kn...
ABSTRACT—Research on twins and unrelated persons liv-ing together indicates that, although differenc...
Differences in heritability and shared environmentality across levels of cognitive ability were asse...
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