The properties of geophysical fields and their effects on elephants and other animals

Geophysical properties of acoustic, seismic, electric, and magnetic waveforms create opportunities and constraints for animals' communication and sensory monitoring of the environment. The geometric spreading of waves differs; at some frequencies, transmission is most efficient and has minimal noise. The spreading properties of seismic waves favor long-distance propagation for communication and environmental monitoring, and would benefit elephants (Elephas maximus and Loxodonta africana), such as in locating subsurface water. Extending C. E. O'Connell-Rodwell, B. T. Amason, and L. A. Hart (2000), a man jumping at 1.11 km propagated seismic waves at 10-40 Hz. Given the noise of lightning and the Schumann resonances, near field magnetic and electric transmission by animals would be most efficient around 1000 Hz.     

Neurocognitive sequelae of pediatric sickle cell disease: a review of the literature.

This literature review summarizes all studies relating neuropsychological performance to neuroimaging findings in pediatric sickle cell disease (N=28; published 1991-2005). Although inconsistencies exist within and across domains, deficits in intelligence (IQ), attention and executive functions, memory, language, visuomotor abilities, and academic achievement have been identified. Overall neurocognitive compromise was revealed to be related to the level of neurological injury and the location of silent infarct. Attentional and executive dysfunction is prevalent and related to frontal lobe abnormalities.     

The harm-benefit tradeoff in "bad deal" trials

This paper examines the nature of the harm-benefit tradeoff in early clinical research for interventions that involve remote possibility of direct benefit and likelihood of direct harms to research participants with fatal prognoses, by drawing on the example of gene transfer trials for glioblastoma multiforme. We argue that the appeal made by the component approach to clinical equipoise fails to account fully for the nature of the harm-benefit tradeoff-individual harm for social benefit-that would be required to justify such research. An analysis of what we label "collateral affective benefits," such as the experience of hope or exercise of altruism, shows that the existence of these motivations reinforces rather than mitigates the necessity of justification by reference to social benefit. Evaluations of social benefit must be taken seriously in the research ethics review process to avoid the exploitation of research participants' motivations of hope or altruism and to avoid the possibility of inadvertent exploitation of high-risk research participants and the harms that would associate with such exploitation.     

Cognitive control deployment is flexibly modulated by social value in early adolescence

Recent mechanistic models of cognitive control define the normative level of control deployment as a function of the effort cost of exerting control balanced against the reward that can be attained by exerting control. Despite these models explaining empirical findings in adults, prior literature has suggested that adolescents may not adaptively integrate value into estimates of how much cognitive control they should deploy. Moreover, much work in adolescent neurodevelopment casts social valuation processes as competing with, and in many cases overwhelming, cognitive control in adolescence. Here, we test whether social incentives can adaptively increase cognitive control. Adolescents (M_age = 14.64, 44 male, N = 87) completed an incentivized cognitive control task in which they could exert cognitive control to receive rewards on behalf of real peers who were rated by all peers in their school grade as being of either high- or low-status. Using Bayesian modeling, we find robust evidence that adolescents exert more cognitive control for high- relative to low-status peers. Moreover, we demonstrate that social incentives, irrespective of their high- or low-status, boost adolescent cognitive control above baseline control where no incentives are offered. Findings support the hypothesis that the cognitive control system in early adolescence is flexibly modulated by social value.     

Never Let Them See You Sweat: Silencing and Striving to Appear Perfect among U.S. College Women

Drawing on Goffman??s (1959) impression management, the present study examined how silencing the self (Jack & Dill, 1992) related to psychological distress in US college women. A sample of 149 women aged 18 to 25 enrolled at a large southwestern U.S. university completed a series of survey instruments aimed at gaining knowledge of how several potentially pressure-filled domains of women??s college environment (i.e., Body Image, Romance, Peers, Academics) may factor into a relationship between Silencing and Distress. Path analysis revealed that Silencing was directly, positively related to each source of pressure with the exception of Academic Engagement (where a negative relationship existed). Furthermore, Silencing was directly, positively related to Anxiety and Depression. Additionally, internalization of the thin ideal and competitiveness were predictive of distress among women who Present Perfection, or strive to appear perfect to others. Cluster analyses revealed 4 interpretable clusters of factors related to distress: Middle-of-the-Road, Moderately Appearance Focused, Other-Focused, and Reject Appearance Norms. The Other-Focused women showed the highest levels of distress and lowest academic engagement while those who Reject Appearance Norms showed the lowest distress and highest academic engagement. These relationships indicated that higher levels of attempting to appear perfect to others were related to higher levels of distress among US college women in our sample. This study points to a factor ??Presenting Perfection?? that may be instrumental in understanding self-silencing behaviors in college women, as well as further understanding the relation between body image, orientation toward others?? judgments, and distress.     

Intrafamilial physical victimization and externalizing behavior problems: Who remain the ‘forgotten’ children?

Over the past few decades, researchers have documented positive associations between direct child maltreatment and exposure to interpersonal violence (including intimate partner violence, community violence, school violence, and media violence) and children's externalizing behavior problems. However, current family violence literature largely ignores the effects of child abuse on other children in the family. A handful of studies have focused on exposure to child abuse and documented the behavioral effects on siblings, and these studies lend support for broadening scholarship focused on this type of family violence. This article presents empirical research and theories that focus on the relationships between child physical abuse and exposure to intimate partner violence and children's externalizing behavior problems. Using this literature as a foundation, an argument is made for the need to focus on children's exposure to child physical abuse. This article presents information from the few studies that have focused on children who were exposed to the physical abuse of a sibling and offers theoretical frameworks, including social learning theory and psychological proximity, as a foundation for future research. The article concludes with a discussion of services that may be necessary for children who have been exposed to the physical abuse of a sibling, including services focused on safety and mental health.     

Theory of Mind and conduct problems in children: Deficits in reading the “emotions of the eyes”

A significant clinical feature of disorders of antisocial behaviour involves difficulties in social functioning. It has been suggested that deficits in “theory of mind” (ToM) reasoning—the ability to decode others’ emotions and thoughts—may underlie social difficulties in these populations. Success in demonstrating ToM impairment associated with antisocial behaviour and psychopathy in adults and children have been limited. In the current study, parent-reported conduct problems were concurrently measured with performance on an advanced test of ToM developed for children, the Child Eyes Test (Journal of Developmental and Learning Disorders, 5, 47–78). Preadolescent and young adolescent children (n=79) drawn from a community sample were required to identify emotions from photographic stimuli depicting the eye region of the face only. Findings suggested a generalised impairment in ToM in children with conduct problems, as indicated by a significant relationship between poor Eyes Test performance and conduct problems, even when IQ, sex and age were controlled for. The findings are discussed in the context of the amygdala theory of psychopathy, and the neural systems suggested to mediate performance on the Eyes Test.