School-based service utilization among urban children with early onset educational and mental health problems: The squeaky wheel phenomenon.

Although elementary schools provide an opportunity for early identification and treatment of academic and psychological problems, relatively little is known about the types of symptoms being addressed in schools. Latent profile analysis on data from 678 urban first graders yielded 3 classes of children: nonsymptomatic (NS), internalizers and average performers (IAP), and externalizers and low performers (ELP), with different combinations of symptoms. Survival analyses conducted on the children's use of services (in Grades 1-9) indicated that students in the ELP class received mental health and special education services faster than those in the NS class, whereas IAP children were no more likely than NS children to receive services. Findings suggest that staff may be more sensitive to early educational and externalizing problems. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of GABA and anxiety in the reconsolidation of conditioned fear.

The current study examined the effects of systemic administration of a GABA agonist [midazolam (MDZ)] and a GABA antagonist (bicuculline) on fear responding after brief CS exposure, a procedure thought to involve memory reconsolidation. Using a contextual fear-conditioning paradigm, rats were initially given two context-shock training trials, followed 24 hrs later by a 90-s context exposure (reactivation), and 24 hrs later by a 3-min context test. In Experiment 1, MDZ (2 mg/kg, i.p.), whereas in Experiment 2, bicuculline (1 mg/kg, i.p.), was administered immediately after reactivation. MDZ reduced conditioned freezing, whereas bicuculline only marginally potentiated conditioned freezing. The MDZ fear disruption effect did not occur in the absence of reactivation, and was evident 10 days after the initial test. Experiment 3 induced high levels of baseline anxiety using the single prolonged stress paradigm, and replicated the essential procedure of Experiment 1. Results indicated that MDZ fear disruption did not differ between high and low anxiety rats. The data suggest the involvement of GABA receptors in reconsolidation processes, and the possible clinical use of MDZ in fear reduction with brief reexposure. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

First Experiments Aiming for Precise Lamb Shift Measurements on Hydrogen-Like Heavy Ions with Low Temperature Calorimeters

The precise determination of the Lamb shift in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields, not accessible otherwise. To increase the accuracy of the Lamb shift measurement on stored heavy ions at the ESR storage ring at GSI, a calorimetric low temperature detector for hard X-rays was developed. A prototype array consisting of 8 pixels with silicon thermistors and Sn or Pb absorbers was applied in first experiments with stored ²³⁸U⁹¹⁺ and ²⁰⁷Pb⁸¹⁺ ions interacting with an internal gas-jet target. In both experiments the Lyman-α lines were, for the first time by using calorimetric low temperature detectors, clearly identified in clean, almost background-free spectra. A total detection efficiency of 1×10⁻⁷ for the Lyman-α lines was reached and an energy resolution of 115 eV was obtained under the present experimental conditions, which corresponds to a considerable improvement of about half an order of magnitude if compared to conventional Ge semiconductor detectors. Finally preliminary results of the data analysis and future perspectives are discussed.      

Ion-Implanted Silicon X-Ray Calorimeters: Present and Future

We now have about 25 years of experience with X-ray calorimeters based on doped semiconductor thermometers. Ion-implanted Si arrays have been used in astrophysics and laboratory atomic physics. The device properties and characteristics are sufficiently well understood to allow optimized designs for a wide variety of applications over the 0.1–100 keV range. With new absorber materials, approaches for absorber attachment and compact, low thermal conductance JFET arrays, it should be possible to advance this technology from the 36 pixel arrays of today to arrays that are about an order of magnitude larger, and with significantly improved energy resolution. These would enable new capabilities on instruments being considered now for missions that may fly in about five years.     

Large Area Transition Edge Sensor X-ray Microcalorimeters for Diffuse X-ray Background Studies

We are developing transition edge sensor (TES) mirocalorimeters with large area (0.72 mm \(^2\) ) absorbers to study the keV diffuse X-ray background. The goal is to develop a 2 cm \(^2\) array of 256 pixels for a sounding rocket payload. We present a pixel design which includes a Mo/Au bilayer TES coupled to a large (850 x 850 x 0.2 \(\upmu \) m \(^3\) ) gold absorber. Our simulations indicate that such a design can achieve energy resolution as good as 1.6 eV FWHM in our target bandpass of 0.05–1 keV. Additionally, thermal modelling shows that for typical gold layers, the position-dependent variation of the pulse shape over the large area of the absorber is not expected to significantly degrade this energy resolution. An array of devices will be fabricated in late 2013 to test this design.     

American Psychological Association Commission on Violence and Youth.

Lists the membership of the commission and discusses its objective of analyzing the roles of perpetrators and victims of violence and the psychosocial consequences of witnessing violent acts and living with the constant threat of violence. The commission is using interdisciplinary expertise to examine the developmental and sustaining factors of violence, as well as frequently targeted groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Investing in children: Government and workplace policies for parents.

Changes in the structure and needs of the American family are requiring changes in government and workplace policies. Current policies related to day care, parental leave, work schedules, income support, and child support enforcement are discussed. Consideration is given to psychological research needed to develop effective policies that do not supplant the role of parents, but rather support them and strengthen families. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rates of DSM–IV–TR trauma exposure and posttraumatic stress disorder among newly matriculated college students.

The negotiation of the freedoms and responsibilities introduced as adolescents begin college may be particularly challenging for those with a trauma history and traumatic stress sequelae (posttraumatic stress disorder; PTSD). The present study examined the prevalence of and risk for trauma and PTSD in a large sample of college students. Matriculating students (N = 3,014; 1,763 female, 1,251 male) at two U.S. universities completed online and paper assessments. Sixty-six percent reported exposure to a Criterion A trauma. Nine percent met criteria for PTSD. Female gender was a risk factor for trauma exposure. Gender and socioeconomic status (SES) were associated with trauma severity. Although in bivariate models, gender and SES were associated with PTSD, multivariate analyses suggested this risk was a function of trauma severity. Thus, students enter college with significant trauma histories and PTSD symptoms. Findings highlight the potential for outreach to incoming students with trauma and point to research directions to enhance understanding of the psychological needs of entering college students. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Semi-supervised kernel canonical correlation analysis with application to human fMRI

Kernel canonical correlation analysis (KCCA) is a general technique for subspace learning that incorporates principal components analysis (PCA) and Fisher linear discriminant analysis (LDA) as special cases. By finding directions that maximize correlation, KCCA learns representations that are more closely tied to the underlying process that generates the data and can ignore high-variance noise directions. However, for data where acquisition in one or more modalities is expensive or otherwise limited, KCCA may suffer from small sample effects. We propose to use semi-supervised Laplacian regularization to utilize data that are present in only one modality. This approach is able to find highly correlated directions that also lie along the data manifold, resulting in a more robust estimate of correlated subspaces.Functional magnetic resonance imaging (fMRI) acquired data are naturally amenable to subspace techniques as data are well aligned. fMRI data of the human brain are a particularly interesting candidate. In this study we implemented various supervised and semi-supervised versions of KCCA on human fMRI data, with regression to single and multi-variate labels (corresponding to video content subjects viewed during the image acquisition). In each variate condition, the semi-supervised variants of KCCA performed better than the supervised variants, including a supervised variant with Laplacian regularization. We additionally analyze the weights learned by the regression in order to infer brain regions that are important to different types of visual processing.     

A person-centered, longitudinal approach to sexual victimization.

Objective: Little research has drawn attention to distinct patterns of sexual victimization across time, although previous findings strongly indicate heterogeneity. Using longitudinal data, we tested a series of latent class growth models in an attempt to find meaningful patterns of sexual victimization frequency among female college students. Method: A sample of women (n = 1,580) answered questions at 5 time points concerning their childhood, adolescent, and collegiate sexual experiences. Latent class growth analysis was used with frequencies of sexual victimization at each of the 5 time points as indicators. Results: A 4-class model was selected on the basis of its fit to the data and its interpretability. The 4 classes are interpreted as low/none, moderate-increasing, decreasing, and high-increasing trajectories of sexual victimization. Negative childhood experiences—childhood sexual abuse, witnessing domestic violence, and parental physical punishment—partially explained latent trajectory membership. Conclusion: Possible implications of this research include the development of more specialized primary, secondary, and tertiary sexual assault prevention programs based on the victimization trajectories indicated by these analyses. (PsycINFO Database Record (c) 2010 APA, all rights reserved)