Prospective dynamic balance control during the swing phase of walking: Stability boundaries and time-to-contact analysis

This study examined the prospective control of the swing phase in young healthy adults while walking at preferred speed over unobstructed ground and during obstacle clearance. Three aspects of swing were examined: (1) the relation of the body Center of Mass (CoM) to the stability boundaries at the base of support; (2) a dynamic time-to-contact analysis of the CoM and swing foot to these boundaries; and (3) the role of head movements in the prospective control of gait and field of view assessment. The time-to-contact analysis of CoM and swing foot showed less stable swing dynamics in the trail foot compared to the lead foot in the approach to the unstable equilibrium, with the CoM leading the swing foot and crossing the anterior stability boundary before the swing foot. Compensations in temporal coupling occurred in the trail limb during the late swing phase. Time-to-contact analysis of head movement showed stronger prospective control of the lead foot, while fixation of the field of view occurred earlier in swing and was closer to the body in the obstacle condition compared to unobstructed walking. The dynamic time-to-contact analysis offers a new approach to assessing the unstable swing phase of walking in different populations.     

Therapists’ experiences with internal representations of clients

Fourteen therapists were interviewed via telephone regarding their experience of “carrying around” their clients with them between sessions (i.e. internal representations, or IRs, of clients), a phenomenon about which little empirically based knowledge exists. Data were analyzed using consensual qualitative research. Findings indicated that overall, therapists have IRs infrequently, most often have IRs of clients struggling with severe or challenging presenting problems, and do receive some training about IRs. When describing a specific IR experience, therapists typically noted a strong therapy relationship, and stated that the IRs typically had specific triggers. The IRs generally consisted of feelings about the client, and typically consisted of thoughts about the client or the felt presence of the client. The IRs generally yielded positive effects, typically both personally and professionally, and were typically discussed with supervisors/consultants. Implications for research, training, and practice are presented.     

Evaluating the Character of People Who Insult the Nation: Implications for Immigrant Integration

We examine immigrant integration by analyzing how natives evaluate immigrants' character. Most literature examines how natives distinguish between immigrants with different levels of assimilation, which is best suited to identifying integration boundaries between different types of immigrants. We shift the analysis and examine the boundary between immigrants and natives, which measures integration by the extent to which immigrant status is relevant for character evaluations. We compare how natives respond to national insults that come from immigrants as opposed to natives. We focus on insulting the nation because it highlights the salience of national identity and clarifies the importance of group boundaries. We measure responses to national insults with vignette experiments from three original surveys in the United States. Our results are consistent with situationist theories of interpersonal interactions because they suggest that character evaluations are more dependent on the situational distinction between people who do and do not insult the nation than the demographic distinction between whether the insult comes from a native or immigrant. These findings have multiple implications for our understanding of national identity, immigrant integration, and immigrant‐native boundaries.     

Micro-mechanical measurements of fracture toughness of bismuth embrittled copper grain boundaries

Measuring the fracture properties of single grain boundaries has until now required macroscopic bi-crystals which are expensive and not always available. We describe a method for fracture testing using micro-cantilevers, manufactured using focussed ion beam machining and tested using a nanoindenter. We have used the method to measure the fracture toughness of selected grain boundaries in bismuth-embrittled copper. This technique is applicable to grain boundaries in other brittle polycrystalline samples for which large bi-crystals cannot be produced for conventional testing.     

On the model for crack roughness statistics

It is pointed out that the distribution introduced by Balankin and Susarrey [A.S. Balankin and O. Susarrey, Phil. Mag. Lett. 79 629 (1999).] (for modelling crack-length and crack-width data) is contained by at least two known families of distributions. Some elementary statistical properties of these families are discussed.     

Grain boundary networks in high-performance,heteroepitaxial, YBCO films on polycrystalline,cube-textured metals

Grain boundaries (GBs) in high-temperature superconductors suppress the critical current density (J _c) dramatically, with the J _c decreasing exponentially with GB angle, especially when GB misorientation exceeds 4°. To reduce the number of high-angle GBs, fabrication of biaxially textured, superconducting wires via heteroepitaxial growth on cube-textured metals has been widely investigated worldwide. Such wires exhibit very high J _c in applied magnetic fields despite having a majority of GBs with total misorientations in the range 4–8°. Here, we show that GB networks in these wires have numerous GBs with out-of-plane misorientations greater than 4° but few boundaries having in-plane misorientations greater than 4°. Transport measurements on bicrystal GBs show that GBs with out-of-plane tilts between 4° and 8° are well linked. Together, these results explain the high performance of superconducting films on cube-textured metals.     

Misorientation characteristics of penetrating morphologies at the growth front of abnormally growing grains in aluminum alloy

The initial stage of abnormal grain growth of the aluminum alloy 5052 has been investigated using electron back-scattered diffraction to analyze the characteristic of misorientations of the penetrating morphology at the growth front. Among the 84 penetrating morphologies examined, none of the penetrated grain boundaries has low angles or coincidence site lattice (CSL) relations, whereas 66 penetrating grain boundaries have low angles or CSL relations. These results strongly suggest that the penetrating morphologies should result from triple-junction wetting.     

FROM EMBODIED TO EXTENDED COGNITION

Embodied cognitive science holds that cognitive processes are deeply and inescapably rooted in our bodily interactions with the world. Our finite, contingent, and mortal embodiment may be not only supportive, but in some cases even constitutive of emotions, thoughts, and experiences. My discussion here will work outward from the neuroanatomy and neurophysiology of the brain to a nervous system which extends to the boundaries of the body. It will extend to nonneural aspects of embodiment and even beyond the boundaries of the body to prosthetics of various kinds, including symbioses with a broad array of cultural artifacts, our symbolic niche, and our relationships with other embodied human beings. While cognition may not always be situated, its origins are embedded in temporally and spatially limited activities. Cognitive work also can be off‐loaded to the body and to the environment in service of action, tool use, group cognition, and social coordination. This can blur the boundaries between brain areas, brain and body, and body and environment, transforming our understanding of mind and personhood to provide a different grounding for faith traditions in general, and of the historically dualist Christian tradition in particular.     

A fugue in four voices: sounding themes and variations on the reflecting team

In this account of an on-going reflecting team, a group of 4 therapists describe how they preserve multiple perspectives, yet join their voices to create coherent, meaningful reflections. This reflecting approach emphasizes developing a theme and creating variations on this theme, in a manner resembling a musical fugue. In addition, the practicalities of creating and sustaining a reflecting team in a private practice context are described.     

Looking into the One‐way Mirror: A Pilot Study on the Impact of Reflecting Teams on Family Members

Reflecting Teams (RTs) are an internationally recognized clinical consultation methodology, first developed by Tom Andersen in 1985. Over the last three decades, family therapists around the world have used RTs to enhance treatment. However, this innovation to family therapy practice is not well‐standardized nor evaluated. The pilot study described in this article is an attempt to expand on the previous studies on RTs, and quantitatively examines RTs conducted with family therapy participants at a university medical center psychiatric institute. Preliminary analyses indicate that after participating in a single RT, family members may feel more hopeful, believe they can better support each other in times of stress, have more confidence in working together, and resolve conflicts. Additionally, the analyses suggest that family members may feel better understood and have more ideas about how to have a conversation with their family members, even though, after the RT, they may not view their family differently. These preliminary results suggest that further studies should explore the influence of RTs on family functioning.