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Direct linkSaunders, Gretchen R. B.; Liu, Mengzhen; Vrieze, Scott; McGue, Matt; Iacono, William G. – Developmental Psychology, 2021
Parent-child similarity is a function of genetic and environmental transmission. In addition, genetic effects not transmitted to offspring may drive parental behavior, thereby affecting the rearing environment of the child. Measuring genetic proclivity directly, through polygenic risk scores (PRSs), provides a way to test for the effect of…
Descriptors: Smoking, Drinking, Parent Influence, Genetics
Johnson, Wendy; Deary, Ian J.; Bouchard, Thomas J., Jr. – Educational and Psychological Measurement, 2018
Most study samples show less variability in key variables than do their source populations due most often to indirect selection into study participation associated with a wide range of personal and circumstantial characteristics. Formulas exist to correct the distortions of population-level correlations created. Formula accuracy has been tested…
Descriptors: Correlation, Sampling, Statistical Distributions, Accuracy
Samek, Diana R.; Goodman, Rebecca J.; Erath, Stephen A.; McGue, Matt; Iacono, William G. – Developmental Psychology, 2016
Prior research has demonstrated both socialization and selection effects for the relationship between antisocial peer affiliation and externalizing problems in adolescence. Less research has evaluated such effects postadolescence. In this study, a cross-lagged panel analysis was used to evaluate the extent of "socialization" (i.e., the…
Descriptors: Adolescents, Young Adults, Peer Relationship, Behavior Disorders
Tarantino, Nicholas; Tully, Erin C.; Garcia, Sarah E.; South, Susan; Iacono, William G.; McGue, Matt – Developmental Psychology, 2014
Adolescence and early adulthood is a time when peer groups become increasingly influential in the lives of young people. Youths exposed to deviant peers risk susceptibility to externalizing behaviors and related psychopathology. In addition to environmental correlates of deviant peer affiliation, a growing body of evidence has suggested that…
Descriptors: Genetics, Peer Groups, Longitudinal Studies, Twins
Johnson, Wendy; Bouchard, Thomas J., Jr. – Intelligence, 2011
The Minnesota Study of Twins Reared Apart (MISTRA) was initiated in 1979 and continued until 2000. It consisted of 139 pairs of twins who had been separated in early childhood and not re-united until adulthood, and members of their families. As part of a broader assessment, these participants completed 42 mental ability tests from three well-known…
Descriptors: Twins, Correlation, Cognitive Ability, Evaluation
Johnson, Wendy; McGue, Matt; Iacono, William G. – Developmental Psychology, 2006
Most studies have considered the effects of particular characteristics on academic achievement individually, which means that little is known about how they function together. Using the population-based Minnesota Twin Family Study, the authors investigated the effects of child academic engagement (interest, involvement, effort), IQ, depression,…
Descriptors: Academic Achievement, Adolescents, Environmental Influences, Genetics
Peer reviewedMarmorstein, Naomi R.; Iacono, William G. – Journal of the American Academy of Child and Adolescent Psychiatry, 2005
Objective: Antisocial behavior that begins in mid- to late adolescence does not fit into commonly accepted taxonomies of antisocial behavior, yet it clearly exists. This study examined how this course of antisocial behavior compares with persisting (beginning by early adolescence and continuing through late adolescence) and desisting (stopping by…
Descriptors: Antisocial Behavior, Adolescents, Psychiatry, Psychological Patterns
