Journal
BEHAVIOR GENETICS
Volume 40, Issue 4, Pages 438-446Publisher
SPRINGER
DOI: 10.1007/s10519-010-9351-3
Keywords
Cognitive ability; Parental education; Moderator; Young adulthood; Twin study; Heritability
Funding
- United States Department of Veterans Affairs
- NIDA [DA04604]
- NIH/NIA [R01 AG018386, R01 AG018384, R01 AG022381, R01 AG022982]
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Hereditary influences account for a substantial proportion of the variance in many cognitive abilities. However, there is increasing recognition that the relative importance of genetic and environmental influences may vary across different socioeconomic levels. The overall goal of the present study was to examine whether parental education has a moderating effect on genetic and environmental influences of general cognitive ability in early adulthood (age 19.6 +/- A 1.5). Participants were 5,955 male twins from the Vietnam Era Twin (VET) Registry. Significant effects of parental education on mean level of general cognitive ability scores were found, but a model without moderating effects of parental education on genetic or environmental influences on cognitive scores proved to be the best fitting model. Some, but not all, previous studies have found significant moderating effects; however, no consistent pattern emerged that could account for between-study differences regarding moderating effects on genetic and environmental influences.
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