Concurrent and Subsequent Associations Between Daily Digital Technology Use and High‐Risk Adolescents’ Mental Health Symptoms

Adolescents are spending an unprecedented amount of time using digital technologies (especially mobile technologies), and there are concerns that adolescents’ constant connectivity is associated with poor mental health, particularly among at‐risk adolescents. Participants included 151 adolescents at risk for mental health problems (M_age = 13.1) who completed a baseline assessment, 30‐day ecological momentary assessment, and 18 month follow‐up assessment. Results from multilevel regression models showed that daily reports of both time spent using digital technologies and the number of text messages sent were associated with increased same‐day attention deficit hyperactivity disorder (ADHD) and conduct disorder (CD) symptoms. Adolescents’ reported digital technology usage and text messaging across the ecological momentary assessment (EMA) period was also associated with poorer self‐regulation and increases in conduct problem symptoms between the baseline and follow‐up assessments.     

Effects of family violence on psychopathology symptoms in children previously exposed to maltreatment

Although many studies suggest that family violence is associated with child psychopathology, multiple features of the home environment might account for this association, such as poverty and caregiver psychopathology. Studies are needed examining how change in psychopathology symptoms is affected by home violence, controlling for children's own developmental symptom histories and other predictors of psychopathology. This study used latent difference score structural equation modeling to test if witnessing home violence and/or experiencing harsh physical discipline predicted changes in psychopathology symptoms among 2,925 youth aged 5-16 years previously exposed to violence. Results demonstrated that harsh physical discipline predicted child-specific changes in externalizing symptoms, whereas witnessing violence predicted child-specific changes in internalizing symptoms across time. Implications for research and policy are discussed.     

Assessment of Science Teaching Efficacy of Preservice Teachers in an Australian University

Research investigating science teaching efficacy was conducted in 1 Australian university. A sample of 314 elementary preservice teachers responded to the Science Teaching Efficacy Belief Instrument (STEBI; L. G. Enochs & I. M. Riggs, 1990), which assesses 2 teaching efficacy dimensions: Personal Science Teaching Efficacy Beliefs (PSTEB) and Science Teaching Outcome Expectancy (STOE). Confirmatory factor analysis substantiated this 2-factor structure. The use of this instrument revealed that the completion of 2 science teaching subjects within the preservice program had a significant effect on the PSTEB, but not the STOE. Similarly, the number of high school science subjects studied by these elementary preservice teachers had a significant effect on PSTEB, but not STOE. However, neither gender nor the particular high school science subjects studied by these elementary preservice teachers had a significant effect on either the PSTEB or the STOE.     

Differentiating the curriculum through the use of problem solving

This is a report of the approaches of two classroom science teachers, supported by a research group, to understanding the consequences of a classroom change implemented in response to a perceived problem. The deficiencies of the normal curriculum in providing for the needs of all students became the focus for the teachers of curriculum development in Year 7. This resulted in the design of activities that required students to consolidate and apply their knowledge to the changes in state of water. The challenge was to create accessible yet demanding problem-solving tasks for all students. In this article, the focus is on the consequences of using these tasks. Student interviews were conducted through the period of using the tasks, students made written comments at the end of the sequence, and records were kept of relevant classroom observations. Our concern that students would recognise that the tasks were graded in difficulty, and hence their own ability as science students determined, proved groundless. There were some interesting yet unexpected outcomes, particularly for student learning about aspects of the ways science proceeds. Anne Symons deceased in 1998.     

Persistence and Fadeout in the Impacts of Child and Adolescent Interventions

Many interventions targeting cognitive skills or socioemotional skills and behaviors demonstrate initially promising but then quickly disappearing impacts. Our article seeks to identify the key features of interventions, as well as the characteristics and environments of the children and adolescents who participate in them, that can be expected to sustain persistently beneficial program impacts. We describe three such processes: skill-building, foot-in-the-door and sustaining environments. We argue that skill-building interventions should target “trifecta” skills—ones that are malleable, fundamental, and would not have developed eventually in the absence of the intervention. Successful foot-in-the-door interventions equip a child with the right skills or capacities at the right time to avoid imminent risks (e.g., grade failure or teen drinking) or seize emerging opportunities (e.g., entry into honors classes). The sustaining environments perspective views high quality of environments subsequent to the completion of the intervention as crucial for sustaining earlier skill gains. These three perspectives generate both complementary and competing hypotheses regarding the nature, timing, and targeting of interventions that generate enduring impacts.     

Effective force and economy of triathletes and cyclists

The effective force applied on the crank, the index of pedalling effectiveness, and the economy of movement at 60, 75, 90, and 105 rev/min cadences were examined in nine cyclists and eight triathletes. Tests were performed on two days. Maximal oxygen uptake was measured and the second ventilatory threshold was estimated on day 1 using a stationary bicycle. On day 2, the four different cadences were tested at about 5% below the second ventilatory threshold. A strain gauge instrumented clip-less pedal mounted on the bicycle enabled us to measure the normal and tangential forces exerted on the pedal, while the pedal and crank angles were monitored with the aid of a video system. Based on this information, the effective force and the index of pedalling effectiveness were calculated. Cyclists produced significantly more effective force and a higher index of pedalling effectiveness at 60 and 75 rev/min and were significantly more economic at all cadences than triathletes. The significant and positive correlation between effective force and economy at all cadences suggests that improvement of the effective force would reflect on economy.