Marriage and personality: a genetic analysis

There is substantial evidence that married people fare better than their unmarried peers on many life outcome variables. The authors asked whether self-selection might partially explain these benefits through genetic influences on personality contributing to propensity to marry. Using a population-based sample of 4,225 women and 2,869 men that included 2,527 complete twin pairs, the authors investigated the phenotypic associations between personality and propensity to marry, the heritability of propensity to marry, and the extent of genetic influence on the link between personality and propensity to marry. The results suggest that propensity to marry is heritable and that the phenotypic link between personality and propensity to marry is genetically influenced.     

Dorsal hippocampus function in learning and expressing a spatial discrimination

Learning to discriminate between spatial locations defined by two adjacent arms of a radial maze in the conditioned cue preference paradigm requires two kinds of information: latent spatial learning when the rats explore the maze with no food available, and learning about food availability in two spatial locations when the rats are then confined in one arm with food and the other with no food. Previous research showed that a functional dorsal hippocampus is not required for latent learning. The present experiments show that it is required for learning about food availability, and during retrieval of both types of information.     

Latent memory for sensitization in Aplysia

In the analysis of memory it is commonly observed that, even after a memory is apparently forgotten, its latent presence can still be revealed in a subsequent learning task. Although well established on a behavioral level, the mechanisms underlying latent memory are not well understood. To begin to explore these mechanisms, we have used Aplysia, a model system that permits the simultaneous study of memory at the behavioral, cellular, and molecular levels. We first demonstrate that robust latent memory is induced by long-term sensitization training of the tail-elicited siphon withdrawal reflex. It is revealed by its ability to facilitate the subsequent induction of three mechanistically distinct temporal domains of sensitization memory: short-term, intermediate-term, and long-term memory. Under our training conditions, the latent memory persists for at least 2 d following the decay of original memory expression but appears to be gone by 4 d. Interestingly, we also find that latent memory is induced even in the absence of overt memory for the original training. These findings now permit the analysis of the cellular and molecular architecture of a common feature of learning and memory.     

Responsibility and perfectionism in OCD: an experimental study

Cognitive models of obsessive-compulsive disorder (OCD) suggest a number of different variables that may play a role in the development and maintenance of obsessive compulsive symptoms [Freeston, M. H., Rhéaume, J., & Ladouceur, R. (1996) Correcting faulty appraisals of obsessional thoughts. Behaviour Research and Therapy, 34, 433-446]. This study's aim was to verify the effect of perfectionism and excessive responsibility on checking behaviors and related variables. Twenty-four moderately perfectionistic subjects (MP) and 27 highly perfectionistic subjects (HP) were submitted to a manipulation of responsibility (low and high). After each manipulation, they had to perform a classification task during which checking behaviors were observed. Results indicate that more checking behaviors (hesitations, checking) occurred in the high responsibility condition than in the low responsibility condition for subjects of both groups. After executing the task in the high responsibility condition, HP subjects reported more influence over and responsibility for negative consequences than MP subjects. These results suggest that high perfectionistic tendencies could predispose individuals to overestimate their perceived responsibility for negative events. Furthermore, perfectionism could be conceived as playing a catalytic role in the perception of responsibility. Results are discussed according to cognitive models of OCD.     

SITUATIONS SOCIALES À POTENTIEL CONFLICTUEL ET CARACTÉRISTIQUES SOCIO-COGNITIVES D'ENFANTS AGRESSIFS ET REJETÉS*

Twenty aggressive and rejected children (boys and girls), twenty socially competent and popular children, and twenty children having average social skills - all of which were first and second graders attending regular school - participated in this study. All were presented on videotape with nine typical peer-conflict situations. Each child was asked about the way that he/she felt, and the way that he/she would resolve each problem situation. In addition, each child had to specify what he/she thought to be the offender's intentions in each problem situation. Several points differentiated first grade from second grade subjects. However, aggressive, socially skilled and average subjects distinguished themselves on only a few items. Differences relating to subject's sex were also scarce. Data support the view that aggressive children know as well as other children how to appropriately resolve interpersonal conflict situations. However, they do not use this knowledge because of impulsivity control problems, an inability to correctly identify others' intentions or a lack of motivation.     

Genetic and Rearing Environmental Influences on Adult Personality: An Analysis of Adopted Twins Reared Apart

ABSTRACT We report a genetic and environmental analysis of California Psychological Inventory (CPI) scale scores gathered on a sample of 45 sets of monozygotic twins reared apart (MZA) and 26 sets of dizygotic twins reared apart (DZA) Analysis of twin intraclass correlations and the results of models fit to the twin data demonstrate that the heritability of most scales and five factors of the CPI is about 50 When compared to results from studies of adult MZ and DZ twins reared together few of the scales demonstrate any common family environmental influence Placement coefficients on the Family Environment Scale (FES) can explain only a minor portion of the correlations for twins reared apart The influence of specific rearing environmental factors on adult personality was evaluated by analyzing the relationship between the FES and the CPI in this adoptee sample One FES factor (Cohesion vs Conflict) does correlate substantially with the CPI factor of Consensuality and may account for up to 24% of the variance in that factor, but the retrospectively gathered     

Workplace Integrity: Differences in Perceptions of Behaviors and Situational Factors

Pre-employment integrity tests assume differences between honest and dishonest individuals in their perceptions of the degree of dishonesty of given behaviors. This exploratory study investigated whether individuals classified as dishonest by an overt integrity test had different perceptions of the honesty of behaviors than those classified as honest. Differences in perceptions of situational factors promoting or deterring honesty were also examined. Dishonest individuals had different perceptions of behaviors and situations than honest individuals, suggesting that the relative influence of situational interventions may vary with the general integrity of a workforce.     

Modulation of Amygdala Response by Cognitive Conflict in Adolescents with Conduct Problems and Varying Levels of CU Traits

Research on Child and Adolescent Psychopathology - Adolescents with conduct problems and low callous-unemotional traits are characterised by high levels of reactive aggression. Prior studies...