Simulations of dolphin kick swimming using smoothed particle hydrodynamics

In competitive human swimming the submerged dolphin kick stroke (underwater undulatory swimming) is utilized after dives and turns. The optimal dolphin kick has a balance between minimizing drag and maximizing thrust while also minimizing the physical exertion required of the swimmer. In this study laser scans of athletes are used to provide realistic swimmer geometries in a single anatomical pose. These are rigged and animated to closely match side-on video footage. Smoothed Particle Hydrodynamics (SPH) fluid simulations are performed to evaluate variants of this swimming stroke technique. This computational approach provides full temporal and spatial information about the flow moving around the deforming swimmer model. The effects of changes in ankle flexibility and stroke frequency are investigated through a parametric study. The results suggest that the net streamwise force on the swimmer is relatively insensitive to ankle flexibility but is strongly dependent on kick frequency.     

Legal briefing: The unbefriended: making healthcare decisions for patients without surrogates (Part 2)

This issue's "Legal Briefing" column continues coverage of recent legal developments involving medical decision making for unbefriended patients. These patients have neither decision-making capacity nor a reasonably available surrogate to make healthcare decisions on their behalf. This topic has been the subject of recent articles in JCE. It has been the subject of major policy reports. Indeed, caring for the unbefriended has even been described as the "single greatest category of problems" encountered in bioethics consultation. Moreover, the scope of the problem continues to expand, especially with rapid growth in the elderly population and with an increased prevalence of dementia. Unfortunately, most U.S.jurisdictions have failed to adopt effective healthcare decision-making systems or procedures for the unbefriended. "Existing mechanisms to address the issue of decision making for the unbefriended are scant and not uniform." Most providers are "muddling through on an ad hoc basis." Still, over the past several months, a number of state legislatures have finally addressed the issue. These developments and a survey of the current landscape are grouped into the following 14 categories. The first two categories define the problem of medical decision making for the unbefriended.The remaining 12 describe different solutions to the problem. The first six categories were covered in Part 1 of this article; the last eight categories are covered in this issue (Part 2). 1. Who are the unbefriended? 2. Risks and problems of the unbefriended. 3. Prevention: advance care planning, diligent searching, and careful capacity assessment. 4. Decision-making mechanisms and standards. 5. Emergency exception to informed consent. 6. Expanded default surrogate lists: close friends. 7. Private guardians. 8. Volunteer guardians. 9. Public guardians. 10. Temporary and emergency guardians. 11. Attending physicians. 12. Other clinicians, individuals, and entities. 13. Institutional committees. 14. External committees.     

How daydreaming relates to life satisfaction, loneliness, and social support: the importance of gender and daydream content

Daydreaming appears to have a complex relationship with life satisfaction and happiness. Here we demonstrate that the facets of daydreaming that predict life satisfaction differ between men and women (Study 1; N=421), that the content of daydreams tends to be social others (Study 2; N=17,556), and that who we daydream about influences the relation between daydreaming and happiness variables like life satisfaction, loneliness, and perceived social support (Study 3; N=361). Specifically, daydreaming about people not close to us predicts more loneliness and less perceived social support, whereas daydreaming about close others predicts greater life satisfaction. Importantly, these patterns hold even when actual social network depth and breadth are statistically controlled, although these associations tend to be small in magnitude. Individual differences and the content of daydreams are thus important to consider when examining how happiness relates to spontaneous thoughts.     

Family Intervention to Prevent Depression and Substance Use Among Adolescents of Depressed Parents

Parental depression places offspring at elevated risk for multiple, co-occurring problems. The purpose of this study was to develop and preliminarily evaluate Project Hope, a family intervention for the prevention of both depression and substance use among adolescent-aged children (M?=?13.9?years) of depressed parents. The program was created by blending two empirically supported interventions: one for depression and another for substance use. Thirty families were randomly assigned to either Project Hope (n?=?16) or a wait-list control condition (n?=?14). Pretests, posttests (n?=?29), and 5-month follow-ups (n?=?28) were conducted separately with parents and youth via phone interviews. Questions asked about the family depression experience, family interactions, family management, coping, adolescent substance use beliefs and refusal skills, adolescent depression, and adolescent substance use. Project Hope was fully developed, manualized, and implemented with a small sample of targeted families. Engagement in the program was relatively high. Preliminary outcome analyses were conducted using 2 (Group) ×3 (Time) analyses of covariance. Results provided some evidence for significant improvements among intervention compared to control participants in indicators of the family depression experience, family management, and coping, and a statistically significant decrease from pretest to posttest in alcohol quantity for intervention compared to control youth. Next steps for this program of research are discussed.     

An Approach to Examining the Proximal and Intermediate Outcomes of an Intensive Family Preservation Program

This study examined the effects of the Boys Town In-Home Family Program (BT-IHFP) on parenting skills, family functioning, and child behavior for at-risk families involved with child protective services. The BT-IHFP is designed as a home-based, family-centered alternative to out-of-home placement with the goal of improving family functioning, keeping families together, and preventing further involvement with child protective services. The model uses a hands-on cognitive-behavioral approach, promotes family engagement, provides 24/7 services to families, and links families to community resources. While it is essential to examine ultimate, long-term outcomes such as family preservation, it is also important to investigate the proximal and intermediate outcomes that address the key changes in behavior that support successful long-term outcomes. The goals of this study were to (1) examine the pre-post change of proximal and intermediate outcomes and (2) examine if improvements in parenting skills, parental roles, and parental stress (proximal outcomes) will be related to improvements in child behavior at home, child behavior at school, and family functioning (intermediate outcomes). Inspecting intake and discharge data for 44 families, 94% were intact at discharge and significant pre-post improvements were found in proximal and intermediate outcomes. These findings suggest that this six-week intensive BT-IHFP holds promise for teaching at-risk families skills to promote positive family functioning.     

Student Development and Support using a Logotherapeutic Approach

This study reports on participants' meaning-centred experiences and perspectives after attending a logotherapy-based student development and support programme. Thirteen students who were enrolled in the first year of the academic programme, in health science programme at a South Africa university, were participants. Qualitative inquiry was used for the data collection and analysis. Findings suggest that a meaning-centred approach may prove to be beneficial for first year university students.     

Further Validational Data on “A Simple Course Evaluation Scale”

Two studies test the hypothesis that a child's scores on two factor analytically derived dimensions of social-emotional functioning are directly related to the frequency and type of his peer interactions. In the first study, three measures of observer rated peer interaction correlated negatively and significantly with high scores on the Apathy-Withdrawal dimension.

In the second study, observation-based frequency counts showed a high frequency of solitary behavior for apathetic-withdrawn children, as well as a number of qualitative differences between the groups in kinds of interactive behavior: angry-defiant children tended to be both verbal and negative-hostile, while apathetic-withdrawn children, when they ddid interact, were unable to cope with aggression directed at them by their peers.     

Individual differences in the neural basis of causal inferencing

This study used fMRI to examine individual differences in the neural basis of causal inferencing. Participants with varying language skill levels, as indexed by scores on the vocabulary portion of the Nelson-Denny Reading Test, read four types of two-sentence passages in which causal relatedness (moderate and distant) and presence or absence of explicit clause connectives were orthogonally varied to manipulate coherence and cohesion during inference generation. Skilled readers showed better neural efficiency (less activation) during all context sentences and during all inference conditions. Increased activation in less-skilled readers was most extensively distributed in the right hemisphere (RH) homologues of left hemisphere (LH) language areas, especially in the most difficult passage types. Skilled readers also showed greater sensitivity to coherence (greater activation and synchronization in moderately related than distantly related passages) whereas less-skilled readers showed sensitivity to cohesion (greater activation and synchronization when clause connectives were present than when they were not). These finding support the hypothesis that skilled reading comprehension requires recruitment of the RH on an “as needed” basis. We describe the dynamic spillover hypothesis, a new theoretical framework that outlines the conditions under which RH language contributions are most likely evoked.     

Male susceptibility to attentional capture by power cues

The present investigation explores the possibility that power has increased salience among males but not females. Evidence indicates that stimuli that are self-relevant or related to chronic goals are more likely to capture attention than neutral information. Across three studies we explore the possibility that the premium males place on power influences how they attend to their environment. Consistent with the common belief that power more readily captures their attention, results indicate that males “dwell” longer on power-related cues (Experiment 1) and are more subject to distraction by task-irrelevant power cues (Experiment 2) than are females. Experiment 3 demonstrates that this increased salience has enduring social consequences by increasing the likelihood that males commit power-relevant material to memory.     

Aretaic Appraisal and Practical Reasons

When we criticize someone for being unjust, deceitful, or imprudent—or commend him as just, truthful, or wise—what is the content of our evaluation? On one way of thinking, evaluating agents in terms that employ aretaic concepts evaluates how they regulate their actions (and judgment‐sensitive attitudes) in light of the reasons that bear on them. On this virtue‐centered view of practical reasons appraisal, evaluations of agents in terms of ethical virtues (and vices) are, inter alia, evaluations of them as practical reasoners. Here I consider and respond to an objection that threatens to debunk the virtue‐centered view.