'Nanotwin' networks connecting columnar defects in YBa2Cu3O7-delta and implications for magnetic vortex interactions

A unique structure, a network of nanotwins, is revealed for the first time in high-energy ion-irradiated YBa₂Cu₃O_7-delta. This structure is shown to form only at ion doses of 1011 cm-2 or greater and thus is not revealed in any earlier electron microscopy studies. In this higher-dose regime, the well known columnar defects are connected by the nanotwin structure, thus affecting bulk superconducting properties. Consequences for a number of published interpretations of such measurements related to pinning and dynamics of magnetic vortices are discussed.     

Mindfulness: Theoretical Foundations and Evidence for its Salutary Effects

Interest in mindfulness and its enhancement has burgeoned in recent years. In this article, we discuss in detail the nature of mindfulness and its relation to other, established theories of attention and awareness in day-to-day life. We then examine theory and evidence for the role of mindfulness in curtailing negative functioning and enhancing positive outcomes in several important life domains, including mental health, physical health, behavioral regulation, and interpersonal relationships. The processes through which mindfulness is theorized to have its beneficial effects are then discussed, along with proposed directions for theoretical development and empirical research.     

Test anxiety,self-evaluative worry,and sleep disturbance in college students

Abstract

The present research examined the extent to which sleep disturbance is involved in the experience of test anxiety. In Study 1, a sample of 80 subjects completed a trait measure of test anxiety and completed a sleep inventory with reference to the past 30 days. In Study 2, a sample of 188 subjects provided measures of trait and state test anxiety and completed a sleep inventory for the night preceding an actual test. The results of Study 1 and Study 2 confirmed that test anxiety is associated with self-reported sleep disturbance. In addition, the results of Study 2 showed that sleep disturbance is also associated with increased state test anxiety. Finally, it was found in Study 2 that sleep disturbance was not related to actual test performance. However, poorer test performance was associated with increased state and trait test anxiety. It is concluded that certain characteristics associated with test anxiety are stable and may be detected in evaluative and non-evaluative situations. The results are discussed with particular reference to their implications for the test anxiety construct itself as well as treatment strategies for the test-anxious student.     

A randomised controlled trial of acceptance-based cognitive behavioural therapy for command hallucinations in psychotic disorders

Command hallucinations represent a special problem for the clinical management of psychosis. While compliance with both non-harmful and harmful commands can be problematic, sometimes in the extreme, active efforts to resist commands may also contribute to their malignancy. Previous research suggests Cognitive Behaviour Therapy (CBT) to be a useful treatment for reducing compliance with harmful command hallucinations. The purpose of this trial was to evaluate whether CBT augmented with acceptance-based strategies from Acceptance and Commitment Therapy could more broadly reduce the negative impact of command hallucinations. Forty-three participants with problematic command hallucinations were randomized to receive 15 sessions of the intervention "TORCH" (Treatment of Resistant Command Hallucinations) or the control, Befriending, then followed up for 6 months. A sub-sample of 17 participants was randomized to a waitlist control before being allocated to TORCH or Befriending. Participants engaged equally well with both treatments. Despite TORCH participants subjectively reporting greater improvement in command hallucinations compared to Befriending participants, the study found no significant group differences in primary and secondary outcome measures based on blinded assessment data. Within-group analyses and comparisons between the combined treatments and waitlist suggested, however, that both treatments were beneficial with a differential pattern of outcomes observed across the two conditions.     

Hypothalamic circuit regulating colonic transit following chronic stress in rats

Although acute stress accelerates colonic transit, the effect of chronic stress on colonic transit remains unclear. In this study, rats received repeated restraint stress (chronic homotypic stress) or various types of stress (chronic heterotypic stress) for 5 and 7 days, respectively. Vehicle saline, oxytocin (OXT), OXT receptor antagonist or corticotropin-releasing factor (CRF) receptor antagonists were administered by intracerebroventricular (ICV) injection prior to restraint stress for 90 min. Immediately after the stress exposure, the entire colon was removed and the geometric center (GC) of Na51CrO4 (a nonabsorbable radioactive marker; 0.5 μCi) distribution was calculated to measure the transit. Gene expression of OXT and CRF in the paraventricular nucleus (PVN) was evaluated by in situ hybridization. Accelerated colonic transit with the acute stressor was no longer observed following chronic homotypic stress. This restored colonic transit was reversed by ICV injection of an OXT antagonist. In contrast, chronic heterotypic stress significantly accelerated colonic transit, which was attenuated by ICV injection of OXT and by a CRF receptor 1 antagonist. OXT mRNA expression in the PVN was significantly increased following chronic homotypic stress, but not chronic heterotypic stress. However, CRF mRNA expression in the PVN was significantly increased following acute and chronic heterotypic stress, but not chronic homotypic stress. These results indicate that central OXT and CRF play a pivotal role in mediating the colonic dysmotility following chronic stress in rats.     

Preventing Children��s Aggression in Immigrant Latino Families: A Mixed Methods Evaluation of the Families and Schools Together Program

The effectiveness of the evidence based program, Families and Schools Together (FAST), was examined in two inter-related studies with immigrant Latino (Mexican) families in the U.S. In Study 1, we reported findings from pre-test, 3-month post-test, and 12-month follow-up surveys of parents and children participating in the FAST program. Families were selected from communities that were randomly assigned to either intervention or control groups. A total of 282 parents (263 mothers and 19 fathers) participated in either the intervention (140 parents) or control (142 parents) condition over the course of 3 years. Each of the parents had a participating focal child; thus, 282 children (144 females and 138 males; average age = 9.5 years) participated in the study. A primary focus of the research was to determine whether participation in FAST led to reductions in children's aggression. Using linear growth models, no differences were noted on aggression between intervention and control groups, although intervention children did show significant improvements in social problem-solving skills and perceptions of collective efficacy. In Study 2, we conducted two focus groups with ten FAST participants to explore whether other unmeasured outcomes were noted and to understand better the mechanisms and impact of FAST. All of the parents in the focus groups reported that FAST had helped them better relate to and communicate with their children, and that the greatest effect was on the behavior of their older children. Results are discussed in terms of cultural fit of the FAST program for immigrant Latino families and future directions.     

Treatment of elopement following a latency‐based interview‐informed,synthesized contingency analysis

Using a latency measure during a functional analysis of problem behavior increases the brevity of the assessment period and decreases risks resulting from exposure to contexts intended to evoke problem behavior. In addition, latency‐based functional analyses may be especially suitable for discrete behaviors such as elopement, which require resetting the environment after each instance of the response. We evaluated a comprehensive assessment and treatment package for the elopement of two children diagnosed with autism. We observed short latencies to elopement during the test condition of the analysis and no elopement during the control condition. We then taught the participants multiple forms of functional communication responses of increasing complexity while elopement was blocked. This was followed by the thinning of reinforcement to a terminal goal, creating a treatment package that nearly eliminated elopement and was socially validated by caregivers.