-
Article
Eye tracking in normal twins
The influence of genetic factors on smooth-pursuit and saccadic eye tracking was determined using 34 pairs of monozygotic and 24 pairs of dizygotic twins. Subjects engaged in smooth-pursuit tracking of differe...
-
Article
The effects of instructions and an engaging visual task on habituation to loud tones: An evaluation of an alternative to the traditional habituation paradigm
The effects of ambiguous instructions and instructions to specifically ignore or attend to stimuli on electrodermal habituation were examined in 88 volunteers who were evenly divided among four groups. The sub...
-
Article
Guilty knowledge
-
Chapter
Ventricular and Sulcal Size at the Onset of Psychosis
To determine whether abnormalities in brain morphology are present at the onset of illness, patients with schizophrenia (n=31), schizophreniform (n=20) and bipolar disorders (n=18), and major depression (n=16)...
-
Chapter
Electrodermal Nonresponding in First-Episode Psychosis as a Function of Stimulus Significance
Although electrodermal activity has been studied in psychiatric patients since the turn of the century, it has only been during the last two decades that specific electrodermal deviations associated with funct...
-
Chapter
Selected Psychophysiological Measures in Depression: The Significance of Electrodermal Activity, Electroencephalographic Asymmetries, and Contingent Negative Variation to Behavioral and Neurobiological Aspects of Depression
Although the phenomenon of depression has been described in one form or another since the time of Hippocrates, major advances in understanding the etiology, course, and treatment of depression have come only r...
-
Article
Unequal rate of monozygotic and like-sex dizygotic twin birth: Evidence from the Minnesota twin family study
It is generally believed that in Caucasian populations the rate of monozygotic (MZ) twinning is approximately equal to the rate of like-sex dizygotic (DZ) twinning so that representative samples of like-sex tw...
-
Article
Life events and personality in late adolescence: Genetic and environmental relations
The relationship between life events and personality was investigated in the Minnesota Twin/Family Study, using 216 monozygotic and 114 dizygotic 17-year-old male twin pairs. Participants completed a life even...
-
Article
Searching for Interactive Effects in the Etiology of Early-Onset Substance Use
This study sought to expand the modest literature investigating gene × environment interactions in the prediction of substance use. Our sample consisted of 591 male twins from the Minnesota Twin Family Study. ...
-
Article
Physical Similarity and Twin Resemblance for Eating Attitudes and Behaviors: A Test of the Equal Environments Assumption
The Equal Environments Assumption (EEA) in twin studies of eating pathology was investigated by examining the hypothesis that twin resemblance for eating attitudes and behaviors is affected by their degree of ...
-
Article
Saccadic disinhibition in schizophrenia patients and their first-degree biological relatives
Several studies have reported that patients with schizophrenia and their relatives perform poorly on antisaccade tasks and have suggested that this deficit represents saccadic disinhibition. If this propositi...
-
Article
Genetic and Environmental Influences on Psychopathy Trait Dimensions in a Community Sample of Male Twins
Psychopathy appears to be comprised of two broad dimensions: impulsivity/antisocial behavior and interpersonal detachment/callousness. This study examined the extent to which variance in these 2 psychopathy tr...
-
Article
Genetic and Environmental Influences on Adolescents’ Perceptions of Current Family Environment
Previous studies of the genetic and environmental components of the Family Environment Scale (FES) have typically reported that scales relating to familial acceptance are moderately to strongly genetically inf...
-
Article
The Association of Early Adolescent Problem Behavior and Adult Psychopathology: A Multivariate Behavioral Genetic Perspective
Research has documented a strong association between early adolescent problem behavior and adult disinhibitory psychopathology, leading some to suggest that the latter can be reduced by preventing or delaying ...
-
Article
The Environments of Adopted and Non-adopted Youth: Evidence on Range Restriction From the Sibling Interaction and Behavior Study (SIBS)
Previous reviews of the literature have suggested that shared environmental effects may be underestimated in adoption studies because adopted individuals are exposed to a restricted range of family environment...
-
Article
Environmental Contributions to Adolescent Delinquency: A Fresh Look at the Shared Environment
Few genetically-informative studies have attempted to explicitly identify the shared environmental (i.e., those environmental influences that contribute to sibling similarity) factors now known to contribute to a...
-
Article
Construct Validity of Adolescent Antisocial Personality Disorder
This study examined the construct validity of antisocial personality disorder (ASPD) diagnosed in adolescence. Boys and girls were grouped by history of DSM-III-R conduct disorder (CD) and ASPD: Controls (n=340) ...
-
Article
A Twin Study of the Genetics of High Cognitive Ability Selected from 11,000 Twin Pairs in Six Studies from Four Countries
Although much genetic research has addressed normal variation in intelligence, little is known about the etiology of high cognitive abilities. Using data from 11,000 twin pairs (age range = 6–71 years) from th...
-
Article
Shared-Environmental Contributions to High Cognitive Ability
Using a combined sample of adolescent twins, biological siblings, and adoptive siblings, we estimated and compared the differential shared-environmentality for high cognitive ability and the shared-environment...
-
Article
Are there Shared Environmental Influences on Adolescent behavior? Evidence from a Study of Adoptive Siblings
The failure to identify specific non-shared environmental influences on behavior coupled with the belief that shared environmental factors contribute minimally to individual differences in behavior has led to ...
