COMT gene polymorphisms,cognitive performance,and physical fitness in older adults

ObjectiveIt is well known that genetic predispositions might influence cognitive performance, particularly in older adults. One gene related to executive functioning is the COMT gene with met/met carriers outperforming val/val carriers in cognitive tasks. Further, it has been shown that fitness is positively related to cognitive functioning in older adults. As both, the COMT genotype and physical exercise have been shown to influence dopamine availability and as changes in dopamine metabolism seem to play a key role in cognitive aging, the aim of this study was to analyze the association of the COMT gene polymorphisms with the relationship between fitness and cognition.DesignWe used a cross-sectional design.MethodSixty-eight healthy older adults between 62 and 79 years of age were analyzed in this study. DNA was extracted from capillary blood samples. Participants performed a modified version of the Flanker Task as an indicator of executive control and a battery of motor and physical tests as indicators of fitness.ResultsHierarchical regression analyses revealed a positive influence of overall fitness and an interactive effect of fitness and COMT polymorphisms on Flanker accuracy performance. Val/val carriers revealed the highest positive correlation between fitness and cognition.ConclusionsOur data suggest that particularly val/val allele carriers benefit from exercise by improved cognitive functioning whereas met/met carriers already perform closer at their optimum level.     

Cognitive Flexibility and Pro‐environmental Behaviour: A Multimethod Approach

While cognitive flexibility has been hypothesized to relate to adaptive, long‐term‐oriented behaviour, empirical support for such a relationship is scarce. In the present article, we examine the role of cognitive flexibility as a correlate of long‐term‐oriented behaviour in the domain of environmental conservation. In a first study (N = 143), we explored potential associations between multiple self‐report scales and performance‐based measures of cognitive flexibility and pro‐environmental behaviour. Based on its results, we conducted a pre‐registered confirmatory study (N = 264) focusing on the most promising correlations found in our exploratory study. This study generated conclusive support for a positive medium‐sized correlation between cognitive flexibility and pro‐environmental behaviour. Exploratory hierarchical regression analyses further revealed that cognitive flexibility accounted for a small portion of variance in pro‐environmental behaviour above and beyond the Big Five. While appearing robust on the level of self‐reports, the relationship between cognitive flexibility and pro‐environmental behaviour did not reliably extend to the level of performance tasks, possibly because of their relatively specific scope. These results illustrate the contribution of cognitive flexibility to understanding individual differences in long‐term‐oriented, pro‐environmental behaviour. © 2019 European Association of Personality Psychology     

Relationship between Family Functioning and Possible Selves in Adolescents from Argentina

Abstract

The goal of this study was to analyze the relationship between different family functioning types and the content, valence, and structure of adolescents’ possible selves (PSs). Participants were adolescents (n?=?392) of both genders (female = 54.9%) from private and catholic high schools in the city of Buenos Aires, Argentina (age, M?=?14.92, SD?=?1.52). We performed a cluster analysis to explore family functioning profiles in terms of communication with parents, promotion of challenges, family cohesion, and flexibility. In order to study family functioning type and PSs content association, we performed a chi-squared test. To study family functioning type differences in PSs valence and structure we conducted a one-way MANOVA. The chi-squared test indicated that there was no significant association between family functioning type and adolescents’ PSs spontaneous content. On the other hand, the MANOVA revealed the existence of significant differences in PSs valence between each type of family functioning group. In regard to the structure of PSs, there were no significant differences between family functioning types. In conclusion, adolescents who perceived positive family functioning have more positive PSs. Family functioning type was not related to PSs content and structure.     

Testing Differential Item Functioning in Small Samples

Abstract

Differential item functioning (DIF) is a pernicious statistical issue that can mask true group differences on a target latent construct. A considerable amount of research has focused on evaluating methods for testing DIF, such as using likelihood ratio tests in item response theory (IRT). Most of this research has focused on the asymptotic properties of DIF testing, in part because many latent variable methods require large samples to obtain stable parameter estimates. Much less research has evaluated these methods in small sample sizes despite the fact that many social and behavioral scientists frequently encounter small samples in practice. In this article, we examine the extent to which model complexity—the number of model parameters estimated simultaneously—affects the recovery of DIF in small samples. We compare three models that vary in complexity: logistic regression with sum scores, the 1-parameter logistic IRT model, and the 2-parameter logistic IRT model. We expected that logistic regression with sum scores and the 1-parameter logistic IRT model would more accurately estimate DIF because these models yielded more stable estimates despite being misspecified. Indeed, a simulation study and empirical example of adolescent substance use show that, even when data are generated from / assumed to be a 2-parameter logistic IRT, using parsimonious models in small samples leads to more powerful tests of DIF while adequately controlling for Type I error. We also provide evidence for minimum sample sizes needed to detect DIF, and we evaluate whether applying corrections for multiple testing is advisable. Finally, we provide recommendations for applied researchers who conduct DIF analyses in small samples.     

Sad mood,emotion regulation,and response inhibition

ABSTRACT

Affect-as-information models, resource allocation models, and arousal biased competition theory predict different effects of mood on cognition. To test these theories, this study examines the effect of sad mood on response inhibition (RI) and whether emotion dysregulation impacts this potential relationship. Participants were 273 undergraduates who wrote about either a typical day or a sad event from their life. They self-reported mood and emotion regulation difficulties, and RI was a composite score of Colour-Word Stroop, Stop-Signal, and go/no-go computerised tasks. The intensity of self-reported sad mood did not affect RI as predicted, but those who wrote about sad events had worse RI. Worse emotion regulation also predicted worse RI. Cognitive loads, rumination, and mind-wandering are discussed as possible mechanisms. Findings are extended from well-established areas such as working memory to the less-established area of RI.     

Mother-Blaming and Clinical Theory

No abstract available for this article.     

How do included and excluded students with SEBD function socially and academically after 1,5 year of special education services?

ABSTRACT

The present study tested three conflicting hypotheses as to how students with social/emotional/behavioural difficulties (SEBD), who showed similar social-emotional, behavioural and academic functioning prior to placement, function socially and academically after they have received additional support either in inclusive regular education or in exclusive special education. Thirty-six included and 15 excluded students with SEBD participated. We collected data from students and teachers with classroom surveys, individual testing sessions with students with SEBD, and from application files. Using Bayesian statistics, our results suggest that excluded students are better socially embedded in exclusive special education and that they perform better academically than comparable included students with SEBD. Special education services in exclusive settings may thus afford certain benefits to some students with SEBD, not typically found in regular education, which can be considered a first indication that there may be valid counterarguments against the ‘inclusion for all’ perspective on educational needs.     

Illness representations,pain and physical function in patients with rheumatic disorders: between- and within-person associations

Objectives: Rehabilitation for patients with rheumatic diseases improves both illness representations (IR) and clinical outcomes such as pain and physical functioning (PF). However, it is unclear whether IR may affect and, in turn, are affected by pain and PF. In this study, we examined both between-person associations and within-person associations between IR and pain/PF over time on three measurement occasions. Furthermore, cross-lagged relationships were examined.

Design and main outcome measures: This secondary analysis is based on data from N?=?186 patients with rheumatic diseases. Data on pain, PF and IR were assessed using self-report questionnaires at the beginning, the end and three months after a 3-week inpatient rehabilitation.

Methods: To separate between- and within-person level, data were analysed using random-intercept cross-lagged panel models.

Results: On both the between-person level (r?=?|0.21|???|0.44|) and the within-person level (r?=?|0.15|???|0.46|), pain and PF were related to cognitive and emotional IR. In addition, we found within-person bidirectional cross-lagged effects between emotional IR and PF.

Conclusion: IR show complex relationships with pain and PF. Improving PF might improve subsequent illness-related emotional distress and vice versa.