This twin study uses structural equation modeling to examine whether white matter integrity is associated with the genetic liability for developing schizophrenia.
This cross-sectional study using a sample of twins/siblings reports that differences in amygdala volume in cannabis users are attributable to common predispositional factors, genetic or environmental in origin, with little support for causal influences of cannabis use.
Zavos et al investigate the degree of genetic and environmental influences, as well as the degree of overlap of etiological influences, on specific psychotic experiences in adolescents and in individuals with many, frequent experiences. See also the editorial by van Os.
Maciejewski et al determine the relative importance of genetic and environmental influences on the variation in nonsuicidal self-injury and suicidal ideation and their covariation.
Monzani et al estimate the degree to which genetic and environmental risk factors are shared and/or unique to dimensionally scored obsessive compulsive disorder, body dysmorphic disorder, hoarding disorder, trichotillomania (hair-pulling disorder), and excoriation (skin-picking) disorder.
Reichborn-Kjennerud et al determine the structure of genetic and environmental risk factors for the symptoms of borderline personality disorder.
Hicks et al examine the familial transmission of externalizing disorders among both adoptive (genetically unrelated) and biological relatives to better distinguish genetic and environmental mechanisms of transmission.
To provide estimates of familial risk for and heritability of obsessive-compulsive disorder
(OCD), Mataix-Cols et al performed population-based, multigenerational, case-control family and twin
studies using Swedish registries. Included were all individuals diagnosed as having OCD between 1969
and 2009 and their available relatives.