Peer Problems and Hyperactivity–Impulsivity Among Norwegian and American Children: The Role of 5‐HTTLPR

Peer problems are linked to attention deficit hyperactivity disorder (ADHD) symptoms and the serotonin system is thought to be involved in ADHD‐related behavior. Hence, from a Gene × Environment perspective, the serotonin transporter 5‐HTTLPR may play a moderating role. In two large community samples, the moderating role of 5‐HTTLPR was examined related to more hyperactivity–impulsivity symptoms (HI symptoms) predicted by more peer problems. In Study 1, involving 642 Norwegian children, results indicated that for s‐allele carriers only, caregiver‐reported peer problems at age 4 predicted more parent‐reported HI symptoms at age 6. In Study 2, similar results emerged involving 482 American children. Discussion focuses on differential sensitivity to the adverse effects of poor peer relations.     

War,Philanthropy, and the National Institute of Hygiene in France

The Rockefeller Foundation helpedestablish two health research institutes inFrance during the German occupation and Vichyrule. These institutes were the precursors ofthe Institut National de Santé et de laRecherche Médicale (INSERM), the Frenchequivalent of the National Institutes of Healthin the United States. This essay rescues theseinstitutes from oblivion, and examines theirorigins and their significance.     

Static and animated presentations in learning dynamic mechanical systems

In two experiments, we investigated how learners comprehend the functioning of a three-pulley system from a presentation on a computer screen. In the first experiment (N = 62) we tested the effect of static vs. animated presentations on comprehension. In the second experiment (N = 45), we tested the effect of user-control of an animated presentation on comprehension. In both experiments the participants were university students. Comprehension was measured with a test including three comprehension indicators. The first experiment indicated that an animation as well as integrated sequential static frames enhanced comprehension. The second experiment showed that a controllable animation did not have a powerful effect on comprehension, except for learners with low spatial and mechanical reasoning abilities.     

Teachers and differentiated instruction: exploring differentiation practices to address student diversity

Given the increasing diversity of the student body, teachers are called to appropriately address students’ various learning needs by means of differentiated instruction (DI). However, empirical research has yielded mixed evidence on teachers’ reported use of DI. Using nationally representative data from the National Educational Panel Study in Germany, this article aimed to explore German (as native language) and Mathematics teachers’ use of DI practices. In addition, this study took into consideration contextual factors, such as school track, and investigated the impact of teachers’ constructivist beliefs on their DI implementation. Results from a mixed analysis of covariance indicated that teachers occasionally implement DI practices. Furthermore, between‐subject effects reported differences across school tracks. It appears that advanced secondary school teachers implement less often DI practices. The covariate of teachers’ constructivist beliefs was also positively linked to overall teachers’ implementation of DI. Implications of the results, as well as further lines of research are discussed.     

Chronotype, cognitive abilities, and academic achievement: A meta-analytic investigation

Four meta-analyses examined relationships between morningness and cognitive ability (total N = 2177), eveningness and cognitive ability (total N = 1519), morningness and academic achievement (total N = 3220), and eveningness and academic achievement (total N = 700). The analyses focused on the population effect size (to reveal the effect across studies) and the homogeneity (to determine if the results of the several experiments are sufficiently similar to warrant their combination into an overall result). In all four cases, the aggregated correlations between chronotype and cognitive ability, as well as chronotype and academic achievement were found to be significant. Eveningness was found to be positively related to individuals' cognitive ability (r = .08), yet negatively related to indicators of academic achievement (r = −.14). Conversely, morningness had a negative relationship with cognitive ability (r = −.04) and a positive correlation with academic indicators (r = .16). Practical implications, including those pertaining to educational policy, are discussed.     

Phaseguide-assisted blood separation microfluidic device for point-of-care applications

We propose a blood separation microfluidic device suitable for point-of-care (POC) applications. By utilizing the high gas permeability of polydimethylsiloxane (PDMS) and phaseguide structures, a simple blood separation device is presented. The device consists of two main parts. A separation chamber with the phaseguide structures, where a sample inlet, a tape-sealed outlet, and a dead-end ring channel are connected, and pneumatic chambers, in which manually operating syringes are plugged. The separation chamber and pneumatic chambers are isolated by a thin PDMS wall. By manually pulling out the plunger of the syringe, a negative pressure is instantaneously generated inside the pneumatic chamber. Due to the gas diffusion from the separation chamber to the neighboring pneumatic chamber through the thin permeable PDMS wall, low pressure can be generated, and then the whole blood at the sample inlets starts to be drawn into the separation chamber and separated through the phaseguide structures. Reversely, after removing the tape at the outlet and manually pushing in the plunger of the syringe, a positive pressure will be created which will cause the air to diffuse back into the ring channel, and therefore allow the separated plasma to be recovered at the outlet on demand. In this paper, we focused on the study of the plasma separation and associated design parameters, such as the PDMS wall thickness, the air permeable overlap area between the separation and pneumatic chambers, and the geometry of the phaseguides. The device required only 2 μl of whole blood but yielding approximately 0.38 μl of separated plasma within 12 min. Without any of the requirements of sophisticated equipment or dilution techniques, we can not only separate the plasma from the whole blood for on-chip analysis but also can push out only the separated plasma to the outlet for off-chip analysis.     

Pathsways to school achievement in very preterm and full term children

Individual differences in academic success were investigated in a geographically defined whole-population sample of very preterm children with a gestational age of less than 32 weeks or a birth weight of less than 1500 gm. The sample consisted of 264 very preterm children (75.6% of German-speaking survivors) and 264 controls matched for gender, socioeconomic status, marital status and age of mother, who were studied from birth. The present analyses focused on the impact of cognitive skills assessed at ages 6 and 8 on academic success at the age 13. IQ scores, prereading skills, reading, spelling, and math performance assessed during the last kindergarten year and again at the end of Grade 2 were used as predictors of academic success in early adolescence. Differences between very pretern children and controls in cognitive abilities already observed in earlier assessments remained stable over time, with controls on average performing more than half a standard deviation above the level of preterm children. Preterm children also performed poorer on the literacy measures and indicators of math performance. Multivariate and causal modeling revealed different prediction patterns for the two groups. Whereas IQ was particularly important for the prediction of academic success in the pre-term sample, general IQ was less relevant for the prediction of academic success in the control group. When subgroups of at-risk children were formed according to birth weight categories, we found that school problems were most pronounced for children with extremely low birth weight (1000 gm and less).     

Investigating Teachers’ Skills in Interpreting Evidence of Student Learning

This study measured and explored the relationships among elementary mathematics teachers’ skill in (a) determining what an item measures, (b) analyzing student work, (c) providing targeted feedback, and (d) determining next instructional steps. Twenty-three elementary mathematics teachers were randomly assigned to one of three conditions: analyzing items and student responses without rubrics, analyzing items and student responses with rubrics, or analyzing items and student responses with rubrics after watching a professional development program on providing feedback to students. Findings show there is a moderate to strong relationship between teachers’ abilities to analyze student responses to infer what a student knows and can do and their abilities to take action based on that information through either providing the student feedback or making appropriate instructional adaptations. Findings show it was relatively more difficult for teachers to provide feedback that was likely to move students forward in their learning than it was for them to analyze a student's response or to determine next instructional steps. No teacher skill differences associated with the different treatment conditions were found.     

Academia as a Profession and the Hierarchy of the Sexes: Paths out of Research in German Universities

The careers of women in German higher education are really careers which lead out of academe: women disappear on the route to the top. In order to track processes and structures which lead to this 'academic mortality of females', this article views higher education as a social field with its own dynamic of development, differentiated according to subject cultures. At the centre of the exploration lie organisational structures, hierarchies, time allocation, customs, traditions, everyday practices and interaction in the scientific community. In order to gain insight into these, detailed interviews were carried out with aspiring academics, institute directors and professors, both at universities and at research institutes outside the orbit of universities; the use of time was studied, and ethnographic material was assembled, together with statistical data. This contribution focuses on the structural conditions of the academic career, on symbolic violence in direct interaction, on patterns of competitive behaviour in the scientific community and on the role of mentors.