Psychological researchers typically distinguish five major domains of individual differences
in human behavior: cognitive abilities, personality, social attitudes, psychological interests, …

Research on substance use disorders is often compartmentalized, focused on understanding
addiction to one substance or substance class at a time. Although this approach has …

This reprinted article originally appeared in Journal of Abnormal Psychology, 2002, Vol 111
(3), 411-424.(The following abstract of the original article appeared in record 2002-17277-…

A genome-wide association study (GWAS) of educational attainment was conducted in a
discovery sample of 101,069 individuals and a replication sample of 25,490. Three …

Valid causal inference is central to progress in theoretical and applied psychology. Although
the randomized experiment is widely considered the gold standard for determining whether …

The Minnesota Twin Family Study is a longitudinal study of 11-year-old and 17-year-old twins
and their parents designed to examine factors related to the etiology of substance abuse …

Genotype imputation is a key component of genetic association studies, where it increases
power, facilitates meta-analysis, and aids interpretation of signals. Genotype imputation is …

Tobacco and alcohol use are leading causes of mortality that influence risk for many complex
diseases and disorders 1 . They are heritable 2 , 3 and etiologically related 4 , 5 behaviors …

Very few genetic variants have been associated with depression and neuroticism, likely
because of limitations on sample size in previous studies. Subjective well-being, a phenotype …

For most psychological, physiological, and medical variables there are substantial age and
sex effects. In assessing twin similarity for these variables, one can either fail to adjust for the …