Optimal spatial filtering for brain oscillatory activity using the Relevance Vector Machine

Over the past decade, various techniques have been proposed for localization of cerebral sources of oscillatory activity on the basis of magnetoencephalography (MEG) or electroencephalography recordings. Beamformers in the frequency domain, in particular, have proved useful in this endeavor. However, the localization accuracy and efficacy of such spatial filters can be markedly limited by bias from correlation between cerebral sources and short duration of source activity, both essential issues in the localization of brain data. Here, we evaluate a method for frequency-domain localization of oscillatory neural activity based on the relevance vector machine (RVM). RVM is a Bayesian algorithm for learning sparse models from possibly overcomplete data sets. The performance of our frequency-domain RVM method (fdRVM) was compared with that of dynamic imaging of coherent sources (DICS), a frequency-domain spatial filter that employs a minimum variance adaptive beamformer (MVAB) approach. The methods were tested both on simulated and real data. Two types of simulated MEG data sets were generated, one with continuous source activity and the other with transiently active sources. The real data sets were from slow finger movements and resting state. Results from simulations show comparable performance for DICS and fdRVM at high signal-to-noise ratios and low correlation. At low SNR or in conditions of high correlation between sources, fdRVM performs markedly better. fdRVM was successful on real data as well, indicating salient focal activations in the sensorimotor area. The resulting high spatial resolution of fdRVM and its sensitivity to low-SNR transient signals could be particularly beneficial when mapping event-related changes of oscillatory activity.     

Reciprocal models of child behavior and depressive symptoms in mothers and fathers in a sample of children at risk for early conduct problems

Although much has been written about transactional models in the study of parenting practices, relatively few researchers have used this approach to examine how child behavior might be related to parental well-being. This study used latent growth curve modeling to test transactional models of age 2 child noncompliance, parental depressive symptoms, and age 4 internalizing and externalizing behaviors using a subsample of families in the Early Steps Multisite Study. In unconditional models, maternal depressive symptoms showed a linear decrease from child ages 2 to 4, whereas paternal depression did not show significant change. Observed child noncompliance at age 2 showed significant associations with concurrent reports of maternal depressive symptoms and trend-level associations with paternal depressive symptoms. For both parents, higher levels of initial depressive symptoms were related to increased age 4 child internalizing behaviors. The findings provide support for reciprocal process models of parental depression and child behavior, and this study is one of the first to present empirical evidence that fathers' depressive symptoms have bidirectional associations with their children's behavior in early childhood.     

Why treat the wounded? Warrior care, military salvage, and national health

Because the goal of military medicine is salvaging the wounded who can return to duty, military medical ethics cannot easily defend devoting scarce resources to those so badly injured that they cannot return to duty. Instead, arguments turn to morale and political obligation to justify care for the seriously wounded. Neither argument is satisfactory. Care for the wounded is not necessary to maintain an army's morale. Nor is there any moral or logical connection between the right to health care (a universal human right) and the duty to defend one's nation (a local political duty). Once badly wounded, soldiers enjoy the same right to medical care as any similarly ill or injured individual. National health care systems grasp this point and offer few additional health care benefits to veterans. In the United States, however, lack of universal health coverage skews the debate to focus on special entitlements for veterans without considering the health care rights that other citizens enjoy.     

‘It all boils down to respect doesn't it?’: Enacting a sense of community in a deprived inner‐city area

Audio recordings of meetings of two community groups in a deprived inner‐city area were analysed, using discursive psychological and conversation analytic techniques to explore situated enactments of ‘community’. Participants situated themselves as members of a geographical community, of an ‘imagined’ community and of other constitutive communities. A sense of community was enacted through five interactional strategies: Affirming moral codes, ‘defending’ other members, distinguishing insiders from outsiders, enacting empowerment and challenging institutions. Participants regularly employed emotional displays and affirmed moral positions, both to constitute ‘community’ and to take action in it. In so doing they worked up social capital and positioned community concerns in ways more reflective of their own situated values than of criminal law or government policy. Copyright © 2011 John Wiley & Sons, Ltd.     

The moral emotions: a social-functionalist account of anger, disgust, and contempt

Recent research has highlighted the important role of emotion in moral judgment and decision making (Greene, Sommerville, Nystrom, Darley, & Cohen, 2001; Haidt, 2001). What is less clear is whether distinctions should be drawn among specific moral emotions. Although some have argued for differences among anger, disgust, and contempt (Rozin, Lowery, Imada, & Haidt, 1999), others have suggested that these terms may describe a single undifferentiated emotional response to morally offensive behavior (Nabi, 2002). In this article, we take a social-functionalist perspective, which makes the prediction that these emotions should be differentiable both in antecedent appraisals and in consequent actions and judgments. Studies 1-3 tested and found support for our predictions concerning distinctions among antecedent appraisals, including (a) a more general role for disgust than has been previously been described, (b) an effect of self-relevance on anger but not other emotions, and (c) a role for contempt in judging incompetent actions. Studies 4 and 5 tested and found support for our specific predictions concerning functional outcomes, providing evidence that these emotions are associated with different consequences. Taken together, these studies support a social-functionalist account of anger, disgust, and contempt and lay the foundation for future research on the negative interpersonal emotions.     

Partage des tâches parentales au sein des couples de mères lesbiennes françaises ayant eu recours à une insémination artificielle avec donneur anonyme

This study, based on a questionnaire survey, examines the division of labor within 52 lesbian couples in France raising at least one child between 6 months and 5 years of age, conceived by anonymous donor insemination. Biological mothers showed slightly more involvement in childcare than non-biological mothers who spent more time in paid employment. The couples’ satisfaction with this asymmetry could be explained by their oscillation between biocentered and/or gendered representations of family and an egalitarian ideal. The link between social support and recognition on one hand, and on the other hand, the modalities of division of labor and related satisfaction seems to show, in a context of legal, judicial and symbolic precariousness, that these couples need parental and familial legitimization.     

Modeling change in memory performance and memory perceptions: findings from the ACTIVE study

Within the context of the ACTIVE study, the current investigation explored the relationships between objective memory and two components of subjective memory (frequency of forgetting and use of external aids) over a five-year period. Relationships were assessed using parallel process latent growth curve models. Results indicated that changes in objective memory were associated with changes in perceived frequency of forgetting, but not with use of external aids (calendars, reminder notes) over time. Findings suggest that memory complaints may accurately reflect decline in objective memory performance, but that these memory changes are not necessarily related to compensatory behaviors.