Stability and change in temperament during adolescence

This study assessed genetic and environmental contributions to temperament during adolescence within the Nonshared Environment and Adolescent Development project (NEAD; D. Reiss, J. M. Neiderhiser, E. M. Hetherington, & R. Plomin, 2000). NEAD is a national study that includes twins and other sibling types who vary in regard to genetic relatedness. Seven hundred twenty sibling pairs (aged 12.1-13.5 years) participated at Time 1, and 395 sibling pairs (aged 14.7-16.2 years) participated again at Time 2. At both Times, mothers and fathers rated their children's temperament (emotionality, activity, sociability, and shyness). At Times 1 and 2, genetic and nonshared environmental factors accounted for variance in temperament, whereas shared environmental contributions were negligible. However, at Time 1, genetic contributions were inflated, and shared environmental contributions were masked if sibling contrast effects were not taken into account. At Time 2, sibling interaction effects had little impact on estimates of genetic and environmental contributions to temperament. Last, temperament stability was primarily explained by genetic factors, whereas both genetic and nonshared environmental factors accounted for change.     

Balance Theory Revisited: Relationship Issue Relevance Affects Imbalance-Induced Tension in Workplace Relationships

The present work applies and extends balance theory by examining the role of relevance of issue to the relationship in balance theory processes within the context of workplace relationships. In Experiment 1, a sample of working adults (N = 81) reported greater job tension when self-supervisor dissimilarity involved a relationship-relevant (vs. non-relationship) ethical dilemma. In Experiment 2, a sample of working students (N = 185) who perceived greater self-supervisor dissimilarity about workplace (vs. family) ethics reported greater job tension, and in turn, less job satisfaction and organizational commitment. Perceiving dissimilarity with a work supervisor in attitudes about relationship-relevant issues may negatively affect outcomes at work. Importantly, these experiments demonstrated that not all dissimilarity is likely to yield negative outcomes; only relationship-relevant (vs. non-relevant) dissimilarity was a catalyst for imbalance-induced tension.     

Assessing the Psychological Type Profile of Canadian Baptist Youth: A Study Employing the Francis Psychological Type Scales for Adolescents (FPTSA)

A growing body of international research employing psychological type theory within the context of congregation studies has drawn attention to the way in which churches draw larger numbers of feeling types than thinking types (among both men and women). These studies have focused on adult churchgoers. The present study extends this field of research among 1630 Canadian Baptist youth attending church-based summer youth programmes (aged 12 to 19 years) who completed the Francis Psychological Type Scales for Adolescents. In this new study, 87 % of male youth and 93 % of female youth preferred feeling. The implications of these findings are assessed for the ministry of the Church among thinking types.     

Heightened ruminative disposition is associated with impaired attentional disengagement from negative relative to positive information: support for the “impaired disengagement” hypothesis

Information processing accounts of rumination propose that impaired attentional disengagement from negative information may underpin heightened disposition to experience ruminative brooding in response to negative mood. The present study examined the relationship between individual differences in ruminative disposition and selective attention, using a paradigm capable of distinguishing between biases in the engagement and disengagement of attention. Results showed that higher dispositional ruminative brooding, as measured by both the brooding subscale of the RRS and an in-vivo assessment of ruminative disposition, was associated with greater relative impairment disengaging attention from negative compared to positive stimuli. These findings thus provide support for the “impaired disengagement” account of ruminative brooding.     

Math Talk and Student Strategy Trajectories: The Case of Two First Grade Classrooms

This study investigated different math-talk facilitations, and conceptualized the teachers' talk moves for productive student mathematics discussions. Our findings suggest that students' strategy development is supported by talk moves coordinating a wide range of student strategies, representations and discussions that are at a process-level and maintain student ownership of ideas, and transitional strategies that connect students' beginning ideas with target strategies.     

Behavioral measures of saccade latency and inhibition in manifest and premanifest Huntington's disease

Initiation and inhibition of saccadic eye movements has been shown to be impaired in patients with Huntington's disease (HD) and premanifest gene carriers (PMGC), and may provide biomarkers useful in tracking phenotypic change. Computerized behavioral tests of prosaccade latency and disinhibition presented to 31 non-gene carriers (NGC), 25 PMGC, and 12 HD patients. These tests provided quantitative performance measures without use of eye-tracking equipment. Significant differences on saccade tests were found, with PMGC intermediate between NGC and HD patients. Saccade latency discriminated PMGC from NGC, whereas saccade disinhibition discriminated PMGC from HD patients. Results suggest utility of behavioral saccade measures as premanifest indicators of phenoconversion in HD.