Children of divorce in a Scandinavian welfare state: Are they less affected than US children?

A fairly common view holds that children's risks of negative outcomes associated with family dissolution are generally small or even nonexistent in Scandinavia, and clearly smaller than what is usually found in the United States. This view was empirically examined in a recent large-scale study of 4,127 12–15-year-old children in Norway, of whom 623 had experienced parental divorce and lived in a single-mother family. The somewhat paradoxical pattern of findings was as follows: (a) The negative associations between parental divorce and various outcomes were found to be generally very similar in Norway and the United States in spite of the great differences in family policy and welfare benefits for single mothers (at the macro level); and (b) Mediational effects of family economic resources were in both countries most marked for the academic achievement area, and the predictive power of such variables was quite similar, again in spite of the great differences in absolute level of the economic resources available to single-mother families in the two countries. The results cast some doubt on the value of the absolute economic deprivation perspective in explaining the results, and the many Norwegian welfare benefits do not seem to mitigate the association between divorce and negative outcomes for the children involved. Also policy implications derived from the economic deprivation perspective are questioned. Alternative interpretations of the findings involving relative deprivation and economic resources as a partial proxy for other non-economic factors are briefly discussed.     

Interplay of Biomechanical Constraints and Kinematic Strategies in Selecting Arm Postures

In this study, the authors examined the interplay between biomechanics and control strategies in the resolution of excess degrees of freedom at the joint level. Seven participants made aimed arm movements from 30 starting points and several starting postures to targets. Final arm postures for movements to a target exhibited substantial joint angle variation. Through regression modeling and by comparing observed final arm postures with biomechanically plausible postures, the authors identified 3 kinematic strategies: (a) Maintain deviations from the average angle at the starting point to the joint's final posture; (b) make torso rotations that are a fixed proportion of shoulder rotations; and (c) adopt a characteristic combination of 4 wrist-positioning approaches. The results demonstrated that kinematic strategies can account for substantial variance in final arm postures, if one takes into account 2 types of individual differences—those that arise inevitably from biomechanical constraints and those that reflect choices in movement strategy.     

Shoulder Joint Position Sense Improves With External Load

Joint position sense (JPS) is important in the maintenance of optimal movement coordination of limb segments in functional activities. Researchers have shown that the sensitivity of musculotendinous mechanoreceptors increases as muscle activation levels increase. In the present study, when 25 participants tried to replicate the same presented position, both vector and elevation angle repositioning errors decreased linearly as the external load increased up to 40% above unloaded shoulder torque. However, external load had no effect on plane repositioning error. The results indicated that JPS increased under conditions of increasing external load but only in the direction of the applied load. That finding indicates that JPS acuity improves as muscle activation levels increase.     

Dynamic Visual Acuity

Forty subjects took part in a one-handed catching task in which the period for which the mechanically projected tennis ball was illuminated in flight was varied systematically. Additionally, they were tested for (a) static visual acuity and (b) dynamic visual acuity, in which angular velocity was varied. As expected, both viewing period in the catching task and angular velocity in the acuity task were significant variables in performance. Correlation and principal-components analyses confirmed the findings of a previous experiment in that the correlated static visual acuity tasks were unrelated to both dynamic visual acuity (even when angular velocity was only 75°/sec) and catching performance. Further, dynamic acuity and catching were related under the majority of the combinations, and most frequently at the highest angular velocity, a fact which suggested that the dynamic element in both tasks is the common factor.     

Father Involvement in Parent Training for Oppositional Child Behavior

Outcome literature (1981 to 1988) on behavioral parent training interventions for nonhandicapped children with oppositional behavior is reviewed to assess the extent and effects of father involvement in parent training. Thirteen studies were found that included some father involvement. Weaknesses of these studies include a failure to observe and measure changed in father-child interactions, a lack of emphasis on the impact of the marital relationship, a lack of attention to similarities in parental child management strategies, and a lack of assessment of paternal characteristics. Further research to assess the effects of including fathers on parent training outcomes can improve the efficiency and effectiveness of these interventions.     

Interactions between interfacial dislocations and γ/γ′ interface during high temperature – low stress creep in nickel-based single crystal superalloy

ABSTRACT

The interaction between interfacial dislocations and γ/γ′ interface is critical to the high temperature creep properties of single crystal superalloys. However, only a few studies have paid attention to the detailed structure such as local interfacial morphologies and the elemental distribution around interfacial dislocations. In this paper, the interfacial protrusions and related dislocations in a single crystal superalloy after creep at high temperature – low stress have been investigated in detail. It is found that the morphology and size of the interfacial protrusions remain almost the same during the early and middle stages of high temperature creep, which indicates a local equilibrium at the interfacial protrusions. Steps at different height are formed at the γ/γ′ interface at the initial stage of high temperature creep since dislocations could move along the γ/γ′ interface, which indicates that dislocation motion at different creep stage may affect the morphology of γ/γ′ interface.     

Single parenting effects: resource access and coping of children in Swaziland

This study investigated single parenting influences on the psychosocial development of children in Swaziland. Participants were a convenience sample of 24 students attending eight urban and rural schools (females?=?54%; males =46%; age range 13–21). Data on experiences of single parenthood and their sense of well-being were collected using focus group interviews. The data were thematically analysed. The findings suggest that children experience physical, material, emotional and social resource depletions. The children reported acceptance, search for meaning and purpose, and hope in the future as positive coping strategies they used to live with resource scarcity. Psychosocial resourcing of children with single parenthood is concomitant with positive self-perception, self-identity and self-esteem.     

Unintentional collective action

In this paper, I examine the manner in which analyses of the action of single agents have been pressed into service for constructing accounts of collective action. Specifically, I argue that the best analogy to collective action is a class of individual action that Carl Ginet has called ‘aggregate action.’ Furthermore, once we use aggregate action as a model of collective action, then we see that existing accounts of collective action have failed to accommodate an important class of (what I shall call) ‘unintentional collective actions.’     

Collective Guilt and Collective Guilt Feelings

Can collectives feel guilt with respect to what they have done? It hasbeen claimed that they cannot. Yet in everyday discourse collectives areoften held to feel guilt, criticized because they do not, and so on.Among other things, this paper considers what such so-called collectiveguilt feelings amount to. If collective guilt feelings are sometimesappropriate, it must be the case that collectives can indeed beguilty. The paper begins with an account of what it is for a collectiveto intend to do something and to act in light of that intention.According to this account, and in senses that are explained, there is acollective that intends to do something if and only if the members of agiven population are jointly committed to intend as a body to do thatthing. A related account of collective belief is also presented. It isthen argued that, depending on the circumstances, a group's action canbe free as opposed to coerced, and that the idea that a collective assuch can be guilty of performing a wrongful act makes sense. The ideathat a group might feel guilt may be rejected because it is assumed thatto feel guilt is to experience a ``pang'' or ``twinge'' of guilt –nothing more and nothing less. Presumably, though, there must becognitions and perhaps behavior involved. In addition, the primacy, eventhe necessity, of ``feeling-sensations'' to feeling guilt in theindividual case has been questioned. Without the presumption that it isalready clear what feeling guilt amounts to, three proposals as to thenature of collective guilt feelings are considered. A ``feeling ofpersonal guilt'' is defined as a feeling of guilt over one's own action.It is argued that it is implausible to construe collective guiltfeelings in terms of members' feelings of personal guilt. ``Membershipguilt feelings'' involve a group member's feeling of guilt over what hisor her group has done. It is argued that such feelings are intelligibleif the member is party to the joint commitment that lies at the base ofthe relevant collective intention and action. However, an account ofcollective guilt in terms of membership guilt feelings is found wanting.Finally, a ``plural subject'' account of collective guilt feelings isarticulated, such that they involve a joint commitment to feel guilt asa body. The parties to a joint commitment of the kind in question may asa result find themselves experiencing ``pangs'' of the kind associatedwith personal and membership guilt feelings. Since these pangs, byhypothesis, arise as a result of the joint commitment to feel guilt as abody, they might be thought of as providing a kind of phenomenology forcollective guilt. Be that as it may, it is argued the plural subjectaccount has much to be said for it.