Towards a broader scope of biomechanics in developmental studies: a commentary on Jensen (2005)

In this article, we discuss where biomechanical analysis can contribute to our understanding of motor development, and more particularly in what ways biomechanics can contribute to (1) explaining the universal sequence in motor milestones; (2) explaining variations in developmental sequence between individuals; (3) understanding the impact of context on the actions of an individual; and (4) understanding, preventing, and managing chronic disabilities. In our view, biomechanics is concerned with the dynamics of the musculo‐skeletal system (MSS) and thus provides insights in the way motion is affected by the activation of muscles and the mechanical interaction between the MSS and the environment. Biomechanical analysis is important in understanding the development of actions that depend on the perceptual‐motor loop although it cannot provide a full account of the changes in the behaviour. The contributions and limitations of specific biomechanical analyses such as the inverse and forward dynamical models are discussed in the light of the article of Jensen (2005). Copyright © 2005 John Wiley & Sons, Ltd.     

Restricting ankle dorsiflexion does not mitigate the benefits of external focus of attention on landing biomechanics in healthy females

PurposeRestricted ankle dorsiflexion can promote aberrant biomechanics associated with risk for knee injury during dynamic activities. Attentionally focused instructions have been used to improve high-risk knee biomechanics during landing tasks. Yet, it is unknown whether attentionally focused instruction can effectively improve landing patterns in the presence of a mechanical restriction on the ankle. Therefore, our purpose was to determine whether restricting ankle dorsiflexion by use of bracing mitigated the effects of attentional foci on landing biomechanics in healthy females.MethodsWe used a crossover design to investigate lower extremity biomechanics in 19 healthy females between the ages of 18–35 during a series of jump-landing tasks. Participants completed 6 blocks of 3 jump-landings on separate force platforms in a randomized order based on brace condition (brace, no brace) and mode of attentional foci (neutral, internal focus [IF], external focus [EF]). Attentionally focused instructions were provided immediately prior to 3 practice jump-landings, followed by 5 test jump-landings with self-controlled feedback only.ResultsAnkle bracing decreased peak dorsiflexion and sagittal range of motion (ROM) (mean difference: 5.7–5.8°), and peak inversion and frontal ROM (mean difference: 2.4–3.0°). However, hip flexion ROM (mean difference: 1.8°) increased compared to the no brace condition. Regardless of ankle bracing, EF instruction increased peak hip flexion (mean difference: 4.9°) and hip flexion range of motion (mean difference: 3.8–4.6°), while decreasing peak knee valgus (mean difference: 0.8–1.0°) and knee valgus moment (mean difference: 0.04 Nm/kg). Additionally, EF instruction increased peak hip abduction to a similar degree when braced (mean difference: 3.6–4.0°) and not braced (mean difference: 2.1–2.5°). Lastly, EF instruction increased hip abduction ROM only when braced (mean difference: 2.3–2.4°), but decreased peak knee valgus power only when not braced (mean difference: 0.18 W/kg).ConclusionsOur findings indicate that mechanically restricting ankle dorsiflexion does not mitigate the ability of EF instruction to enhance jump-landing performance by means of improving hip and knee biomechanics in healthy females. However, our findings suggest an improved ability to control the rate of knee valgus loading when not braced. Therefore, we conclude that EF instruction remains a viable clinical strategy to improve landing patterns in the presence of restricted ankle dorsiflexion, yet this approach may be ineffective to reduce the rate of knee joint loading.     

Journal received

David Lewis [1988; 1996] canvases an anti-Humean thesis about mental states: that the rational agent desires something to the extent that he or she believes it to be good. Lewis offers and refutes a decision-theoretic formulation of it, the 'Desire-as-Belief Thesis'. Other authors have since added further negative results in the spirit of Lewis's. We explore ways of being anti-Humean that evade all these negative results. We begin by providing background on evidential decision theory and on Lewis's negative results. We then introduce what we call the indexicality loophole: if the goodness of a proposition is indexical, partly a function of an agent's mental state, then the negative results have no purchase. Thus we propose a variant of Desire-as-Belief that exploits this loophole. We argue that a number of meta-ethical positions are committed to just such indexicality. Indeed, we show that with one central sort of evaluative belief--the belief that an option is right--the indexicality loophole can be exploited in various interesting ways. Moreover, on some accounts, 'good' is indexical in the same way. Thus, it seems that the anti-Humean can dodge the negative results.     

Biomechanics Concept Inventory

A third version of a biomechanics concept inventory was developed and administered to 41 kinesiology majors before and after an introductory biomechanics class to build a larger pool of questions for course evaluation. The test measured understanding of four prerequisite and eight competencies based on national standards. Mean and standard deviation normalized gain was 29% (21) of maximum possible improvement and was similar to previous versions of the test given to students at the same university. Biomechanics instructors can use questions from all versions of the Biomechanics Concept Inventory to customize tests for evaluating instructional techniques in biomechanics.     

Ambiguity and rationality

Recently, several theories of decision making and probability judgment have been proposed that take into account ambiguity (Einhorn and Hogarth, 1985; Gardenfors and Sahlin, 1982). However, none of these theories explains exactly what the psychological causes of ambiguity are or addresses the issue of whether ambiguity effects are rational. In this paper, we define ambiguity as the subjective experience of missing information relevant to a prediction. We show how this definition can explain why ambiguity affects decisions in the ways it does. We argue that there are a variety of rational reasons ambiguity affects probability judgments and choices in the ways it does. However, we argue that the ambiguity effect does not cast doubt on the claim that utility theory is a standard of rational choice. Rather, we suggest that the effect of ambiguity on decisions highlights the fact that utility theory, like any normative model of decision making only prescribes the optimal decision, given what one knows.     

Conditional Probability in the Light of Qualitative Belief Change

We explore ways in which purely qualitative belief change in the AGM tradition throws light on options in the treatment of conditional probability. First, by helping see why it can be useful to go beyond the ratio rule defining conditional from one-place probability. Second, by clarifying what is at stake in different ways of doing that. Third, by suggesting novel forms of conditional probability corresponding to familiar variants of qualitative belief change, and conversely. Likewise, we explain how recent work on the qualitative part of probabilistic inference leads to a very broad class of ‘proto-probability’ functions.     

Patterns: Basic Units of Emotional Memory

In psychoanalysis, we attempt to engage with one another in ways that enhance understanding. We tend to valorize the verbal domains, yet much of the information we seek may be relatively inaccessible to conscious awareness, obscured by trauma or by the early age at which the information was encoded. These types of information are stored within the body as sensory memories, in which it is through the patterns of the communications that meanings are derived. Affect, most particularly, is known through its patterns of prosody and intensity. Greater appreciation of the patterned forms that underlie emotional memory can help us to better locate ourselves within this infinitely complex and fertile realm of nonverbal understandings, and to learn to communicate these understandings in constructive ways.     

Erratic Appliances and Energy Awareness

We are exploring how to increase energy awareness through critical interaction design, creating objects that expose issues related to energy consumption in various ways. To draw attention to energy beyond ordinary conceptions as a technical solution in everyday life, we inquire into other ways of relating to energy in design and to uncover the properties of energy as a design material. To learn more about how energy can be made more present in product design, we have been redesigning a series of everyday objects around the theme of ‘erratic appliances’. As household energy consumption increases, these appliances start to behave strangely. The aim was to use designerly and experience-based means to make people aware of their energy consumption instead of measuring energy consumption solely with meters and numeric displays.     

Behavioral ethics for Homo economicus,Homo heuristicus,and Homo duplex

In this article we explore how assumptions about human nature may influence the ways one might try to promote ethical behavior in organizations. We summarize two common views of human nature in organizational research—Homo economicus and Homo heuristicus. We then extend these views by putting forward a third view of human nature initially proposed by Emile Durkheim—Homo duplex—which describes human beings as moving back and forth between a lower (individual) and higher (collective) level. We suggest that the Homo duplex view is uniquely equipped to account for variables of interest to organizational scholars because of its attention to a fundamental tension: People in organizations can be both selfish and groupish, and the balance between those tendencies influences the ethical profile of the organization in complex ways. We end with a discussion of the theoretical implications of the Homo duplex view for behavioral ethics researchers.     

Group Therapy for Loss: Attachment,Intersubjectivity, and Healing

Loss is a fundamental human experience that can impact a person’s mental health in diverse ways. While this experience is potentially formative, harmful manifestations can fracture one’s sense of self and undermine relational health. In this article, we present a rationale for process-oriented group therapy focused on healing relational injuries associated with loss. We draw on attachment, self-psychology, intersubjectivity, and Yalom & Leszcz’s (2005) model of group psychotherapy to explore how group processes allow clients to work through losses and relational frustrations in the here-and-now. A case vignette and discussion offer practical insight on the ways in which loss manifests in the room and demonstrate the uniqueness of the group setting for reparative processing.     

Representational momentum for the human body: Awkwardness matters,experience does not

Perception of the human body appears to involve predictive simulations that project forward to track unfolding body-motion events. Here we use representational momentum (RM) to investigate whether implicit knowledge of a learned arbitrary system of body movement such as sign language influences this prediction process, and how this compares to implicit knowledge of biomechanics. Experiment 1 showed greater RM for sign language stimuli in the correct direction of the sign than in the reverse direction, but unexpectedly this held true for non-signers as well as signers. Experiment 2 supported two biomechanical explanations for this result (an effect of downward movement, and an effect of the direction that the movement had actually been performed by the model), and Experiments 3 and 4 found no residual enhancement of RM in signers when these factors were controlled. In fact, surprisingly, the opposite was found: signers showed reduced RM for signs. Experiment 5 verified the effect of biomechanical knowledge by testing arm movements that are easy to perform in one direction but awkward in the reverse direction, and found greater RM for the easy direction. We conclude that while perceptual prediction is shaped by implicit knowledge of biomechanics (the awkwardness effect), it is surprisingly insensitive to expectations derived from learned movement patterns. Results are discussed in terms of recent findings on the mirror system.     

EMOTION AND COGNITION IN STUDENTS WHO STRUGGLE TO READ: NEW INSIGHTS AND IDEAS

As educators, we need to change the way we think about cognition and emotion, especially for children who struggle to read. Emotion and cognition work in parallel in subtle and powerful ways. In this article, we explore the relationship between emotion and cognition in a group of children with reading disabilities in grades five through nine. We investigate their emotional reactions to reading and the influence of emotions on their cognition, mood, and self-schemas.

We present our results in themes that arose from our conversations with the students and their teachers. From our themes, we designed a Checklist of Emotional Distress Related to Reading that teachers and parents can use to determine the impact of emotions on the children in their lives. We present suggestions at the end that teachers and others can use to better understand and assist children identified by the checklist.     

A critique of humanitarian reason: agency,power, and privilege

This paper offers a critical analysis of the work of western humanitarian NGOs operating in the African continent. We argue that in most cases, NGOs and their supporters are deaf to the actual wants, needs, and desires – or, in other words, the agency – of those they are trying to aid. We do this by first offering a series of ways of understanding the ideological commitments that inform the work of many humanitarian NGOs and those who donate to them. In this, we expose the reasons leading to the failure of such individuals and organizations to recognize and take account of the agency of those they seek to help. Second, we offer evidence of the problematic outcome of this failure when coupled with a lack of recognition of the wider context of many of the conflicts that lead to the suffering of those that such NGOs intend to aid. In doing this, we expose the ways in which an NGO's own position can reinforce and contribute to the continuance of this suffering. This, we argue results from the simplified, inaccurate, and de-politicized ways in which NGOs tend to portray the problem of suffering both to those they solicit for donations and in their own conception of the problems and the ‘moral’ role that the organization itself plays in its work.     

Taxonomising the senses

I argue that we should reject the sparse view that there are or could be only a small number of rather distinct senses. When one appreciates this then one can see that there is no need to choose between the standard criteria that have been proposed as ways of individuating the senses—representation, phenomenal character, proximal stimulus and sense organ—or any other criteria that one may deem important. Rather, one can use these criteria in conjunction to form a fine-grained taxonomy of the senses. We can think of these criteria as defining a multidimensional space within which we can locate each of the senses that we are familiar with and which also defines the space of possible senses there could be.     

Emotions Know Best: The Advantage of Emotional versus Cognitive Responses to Failure

Making mistakes or failing at tasks is a common occurrence in human life. People can respond to and cope with failure in many ways. In this research, we examine potential advantages of relatively emotional (versus cognitive) responses to failure. In particular, we study how effort and time spent in subsequent tasks depend on whether people predominantly focus on their emotions or their cognitions as they respond to a failure. We demonstrate that, left to their own means, people's cognitions upon a failure are mainly justificatory in nature and thus do not automatically have the commonly believed reflective, self‐improving qualities. We further argue and demonstrate that a relative focus on cognitions following a failure can prevent improvement in subsequent episodes, but a focus on emotions can allow for learning and, therefore, increased effort. Copyright © 2017 John Wiley & Sons, Ltd.     

Consuming the authentic Gettysburg: How a tourist landscape becomes an authentic experience

• While authenticity pervades everyday consumption in museums, restaurants, theme parks, gift shops, and heritage attractions, among other commercial milieus, academic work on the concept of authenticity remains vague both in terms of its definition and its marketing relevance. In this study, we unpack the concept of authenticity in a Civil War battlefield and we provide insight as to its theoretical relevance for consumption. Our findings elucidate the distinction between authenticity as a product feature and authenticity as an experience. We show that consumer perceptions of a site's authenticity are articulated in five distinct ways: object related, factual, locational, personage, and contextual. We also point out the contribution of each notion of perceived authenticity in sparking consumer imagination and connecting them with the Civil War narrative. We suggest avenues that marketing managers can use to stage authenticity in a commercial environments at both substantive communicative levels. Our study reveals consumers as active agents who participate in the marketplace construction of authenticity in multiple ways. It is also shown that authenticity partakes in the construction of a national imaginary as a negotiated, collective act. We also provide insight as to the distinction between “authentic” and “inauthentic” commercial sites and the way in which even fictitious sites can be perceived as authentic.

Copyright © 2008 John Wiley & Sons, Ltd.     

Talking about ‘Fairness’ in Football and Politics: The Case of Navad

ABSTRACT

We argue that sport in general, and association football in particular, are activities that invite spectators and players alike to talk about them. Using a Wittgensteinian approach, we argued more precisely that football, like any sport, may be understood as a form of life, and as such that it enables speakers to talk about it in quite specific ways, not least in the manner in which normative terms, such as fairness and bias, are used. Football thereby creates a metaphorical space, we suggest, in which there is a freedom to explore and play with language, and in particular normative language, even if that language-use is repressed in the wider political society. Using the example of the Iranian television programme Navad as a case study, we explore the ways in which talk about fairness in the context of football can develop and sustain a competence in the use of political and moral language-use even when that competence is under-threat elsewhere.     

How simulations fail

‘The problem with simulations is that they are doomed to succeed.’ So runs a common criticism of simulations—that they can be used to ‘prove’ anything and are thus of little or no scientific value. While this particular objection represents a minority view, especially among those who work with simulations in a scientific context, it raises a difficult question: what standards should we use to differentiate a simulation that fails from one that succeeds? In this paper we build on a structural analysis of simulation developed in previous work to provide an evaluative account of the variety of ways in which simulations do fail. We expand the structural analysis in terms of the relationship between a simulation and its real-world target emphasizing the important role of aspects intended to correspond and also those specifically intended not to correspond to reality. The result is an outline both of the ways in which simulations can fail and the scientific importance of those various forms of failure.