Local dynamic stability of the spine and its coordinated lower joints during repetitive Lifting: Effects of fatigue and chronic low back pain

The nonlinear Lyapunov exponent (LyE) has been proven effective for evaluating the local stability of human movement and exploring the effects of load, speed and direction of individuals with and without nonspecific chronic low back pain (CLBP). The purpose of this study was to examine spinal and lower joint stability and response to fatigue of individuals with and without CLBP while performing lifting-lowering movements. Fourteen healthy individuals and 14 patients with nonspecific CLBP were recruited to perform lifting movement repeatedly while holding two equally-sized dumbbells in their hands. The participants continued lifting until they reported their highest level of fatigue. Kinematic data for the spine and its coordinated lower joints were recorded during the task (more than 40 lifting cycles on average). The first and last 20 cycles of each cyclic time series were defined as early- and late-fatigue conditions, respectively. The maximum LyE was estimated to quantify the local dynamic stability of the angular displacement time series of the spine, hip, knee and ankle on different anatomical planes in both the early- and late-fatigue conditions. The results revealed that local stability of the spine and hip was affected by fatigue. Spinal stability decreased as fatigue increased on the sagittal plane (p < 0.05). The hip exhibited a similar affectation (destabilization under fatigue) on all anatomical planes. Patients with CLBP showed more stable hip movement on the frontal and transverse planes (p < 0.05). These results suggested that lifting/progressive fatigue could increase the risk of injury to the spine and hip. These findings indicate that patients with CLBP applied different control strategies for the hip; thus, spinal control stability should be evaluated together with the stability of the lower joints.     

Association between fine motor skills and binocular visual function in children with reading difficulties

Performance of fine motor skills (FMS) assessed by a clinical test battery has been associated with reading achievement in school-age children. However, the nature of this association remains to be established. The aim of this study was to assess FMS in children with reading difficulties using two experimental tasks, and to determine if performance is associated with reduced binocular function. We hypothesized that in comparison to an age- and sex-matched control group, children identified with reading difficulties will perform worse only on a motor task that has been shown to rely on binocular input. To test this hypothesis, motor performance was assessed using two tasks: bead-threading and peg-board in 19 children who were reading below expected grade and age-level. Binocular vision assessment included tests for stereoacuity, fusional vergence, amplitude of accommodation, and accommodative facility. In comparison to the control group, children with reading difficulties performed significantly worse on the bead-threading task. In contrast, performance on the peg-board task was similar in both groups. Accommodative facility was the only measure of binocular function significantly associated with motor performance. Findings from our exploratory study suggest that normal binocular vision may provide an important sensory input for the optimal development of FMS and reading. Given the small sample size tested in the current study, further investigation to assess the contribution of binocular vision to the development and performance of FMS and reading is warranted.     

Representational momentum in children born preterm and at term

The term representational momentum (RM) refers to the idea that our memory representations for moving objects incorporate information about movement – a fact that can lead us to make errors when judging an object’s location (the RM effect). In this study, we explored the RM effect in a sample of children born very prematurely and a sample born at term. Because preterm children are known to be at risk for problems with motion perception, we anticipated that they would show a weaker or absent RM effect. This prediction was confirmed. In addition, we found that, in both samples of children, 5–6 year olds showed a reduced RM effect compared to 7–9 year olds. These results demonstrate that the ability to represent motion information in memory shows continued development over this age range, and may help to elucidate factors contributing to problems with fine and gross motor planning and execution that have been observed in the preterm population. We propose that problems affecting the formation, maintenance, or use of predictive models, or motion extrapolation skills, may have cascading effects on the development of other abilities.     

MARTIN LUTHER'S EXPERIENTIAL THEOLOGY AS A MODEL FOR FAITH-SCIENCE RELATIONSHIPS

The approach of experiential realism could indicate where science and faith deal with the same reality, where science questions faith assumptions, and where faith goes beyond the mandate and method of science. Although prescientific, Martin Luther's theology is the classical prototype of an experiential theology. We experience God's creative power in all of reality. We discern its regularities through observation and reason. So faith opens up all the space needed by science. However, experienced reality is highly ambiguous. It obscures God's intentions. God's intentions are revealed in the proclamation of the gospel: God is unconditionally for us and with us and not against us. This proclamation is a promise, appropriated in faith, and geared to a vision of what ought to become. It is based on the interpretation of a catastrophe—the cross of Christ—as God's pivotal redemptive act in human history. It goes beyond the mandate and method of science, yet it is capable of giving the latter a sense of purpose, criteria of acceptability, and authority to act in the interests of humanity and the earth. Theology challenges science to acknowledge the necessity of a transcendent frame of reference and moral accountability. Scientific insight challenges theology to reconceptualize its assumptions on God, creation, and eschatology to integrate best science.     

La révision du texte : une activité de contrôle et de réflexion

Recent proposals in the field of text revision reveal significant changes in perspective concerning cognitive processes involved in writing. Whereas revision has been considered for a long time as being aimed at enhancing writing, this activity is now seen as a control of the different writing processes. Thus, planning is now added to this control process. Our review shows how results of novel studies strengthen this conception and in which way further researches should be pursued. In particular, we focus on three issues: training of control performed by expert writers, the cognitive cost of the required cognitive treatments and the conditions which permit to increase this control among writers during learning.     

Early development of visual attention in infants in rural Malawi

Eye tracking research has shown that infants develop a repertoire of attentional capacities during the first year. The majority of studies examining the early development of attention comes from Western, high‐resource countries. We examined visual attention in a heterogeneous sample of infants in rural Malawi (N = 312–376, depending on analysis). Infants were assessed with eye‐tracking‐based tests that targeted visual orienting, anticipatory looking, and attention to faces at 7 and 9 months. Consistent with prior research, infants exhibited active visual search for salient visual targets, anticipatory saccades to predictable events, and a robust attentional bias for happy and fearful faces. Individual variations in these processes had low to moderate odd‐even split‐half and test‐retest reliability. There were no consistent associations between attention measures and gestational age, nutritional status, or characteristics of the rearing environment (i.e., maternal cognition, psychosocial well‐being, socioeconomic status, and care practices). The results replicate infants’ early attentional biases in a large, unique sample, and suggest that some of these biases (e.g., bias for faces) are pronounced in low‐resource settings. The results provided no evidence that the initial manifestation of infants’ attentional capacities is associated with risk factors that are common in low‐resource environments.     

Risk or resource: Does school climate moderate the influence of community violence on children’s social‐emotional development in the Democratic Republic of Congo?

Exposure to community violence is thought to create risk for the social and emotional development of children, including those children living in low‐income, conflict‐affected countries. In the absence of other types of community resources, schools may be one of the few community resources that can help buffer children from the negative effects of community violence exposure. We sampled 8,300 students ranging in age from 6–18 years in 123 schools from the eastern Democratic Republic of Congo to examine whether and how two distinct dimensions of positive school climate can protect two key features of children's social‐emotional development in the presence of community violence. Multi‐level models tested the hypothesis that students’ perceptions of a positive school climate moderated the relation between community violence and self‐reported mental health problems and peer victimization. Findings support the hypothesis. Specifically, a positive school climate protected against mental health problems and peer victimization in the presence of high community violence. Students who experienced high community violence and a negative school climate generally demonstrated the worst development. We find complex interactions between the dimensions of school climate and exposure to violence on student social‐emotional development that highlight the salience of children's contexts for developmental studies in low‐income countries. We use dynamic developmental systems theory and differential impact to discuss the dual potential of schools as a buffer against the effects of violence or as a source of compounded risk.     

Two types of serial dependence in visual working memory

Stimulus representations in working memory depend on memory traces of past stimuli both from previous trials and from the current trial. However, it is unclear whether the same or different mechanisms underlie this serial dependence across and within trials. We directly contrasted estimates of bias for pairs of immediately successive stimuli across and within trials. In each trial, participants memorized two consecutive motion direction stimuli (S1 and S2) and after a short delay were cued to report one of them. We found serial dependence across trials: The current S1 was attracted towards the preceding S2 when the latter had been cued for report. In contrast, within the same trial S2 was repulsed from S1. In addition, repulsion within a trial occurred for a broader range of motion direction differences between stimuli than attraction across trials. A second experiment in which 25% of trials did not require a response demonstrated that across‐trial attraction did not depend on whether the previous S2 actually had to be reported. Our findings provide evidence for two types of serial dependence operating across and within trials. They support the notion of different mechanisms integrating or segregating current from similar past memory contents depending on their task relevance.     

Increasing access to low‐intensity interventions for childhood anxiety: A pilot study of a guided self‐help program for Scandinavian parents

Cognitive Behavior Therapy (CBT) is an effective treatment for child anxiety. However, access to treatment is limited. It has been suggested that low‐intensity formats of parent‐delivered CBT may improve access to treatment. Our aim was to develop and pilot‐test the acceptability and effect of a low‐intensity therapist‐guided parent‐delivered group program for anxious children (age 7–12 years) adjusted to the Scandinavian culture. The program required 1.5 hours of therapist‐time per family. Mothers, fathers and children reported on revised child anxiety and depression scale (RCADS) at referral, pre‐ and post‐treatment. Mothers and fathers also gave a qualitative account of their experiences. Thirty‐one families were enrolled and only one family dropped out. Mean age of the children was 9 years. Intent‐to‐treat analyses revealed significant reductions in anxiety and depressive symptoms from pre‐ to post‐treatment for all informants. Large effect sizes were found for child anxiety symptoms as reported by mothers and fathers, and for child depressive symptoms as reported by mothers. Medium to large effect sizes was found for the self‐reported anxiety symptoms by the children, and for depressive symptoms reported by both children and fathers. More than 93% of the parents would recommend the program. Results suggest that our program may provide a new approach to improve access to treatment for anxious children in Scandinavia; however, further research must be conducted before firm conclusions can be drawn.