Body configuration as a predictor of centre of mass displacement in a forward reactive step

In balance perturbations that elicit backwards reactive steps, body configuration at stepping contact is related to likelihood of balance recovery. However, less is known about the relationship between body configuration (at stepping contact) and underlying centre of mass (COM) dynamics during dynamic perturbations requiring a forward reactive step. Accordingly, the primary objective of this study was to characterize the potential relationships between body configuration and COM displacement during simulated trips. Towards determining the robustness of these relationships, trips were simulated in both baseline and increased passive joint stiffness conditions. Sixteen healthy adults participated in this study. Trips were simulated using a tether release paradigm where participants were suddenly released, necessitating a forward step (onto a force plate) to recover their balance. Trials were performed in a baseline unconstrained condition, and in a ‘corset’ condition to increase passive stiffness of the trunk and hips. In all trials, whole body kinematics and kinetics were collected. Multiple linear regression models were run to assess the relationship of body angles to COM displacement in both the anteroposterior (AP) and mediolateral (ML) planes. Regression models showed a significant association of sagittal plane body configuration to both COM displacement at stepping contact and maximum COM displacement in the AP plane. Across models, the strongest predictor was the trail leg angle. Associations were stronger in the increased passive stiffness condition (average R² = 0.366) compared to the baseline condition (average R² = 0.266). Poor association of body configuration to COM displacement was found in the ML plane. The significant associations observed between body configuration and COM dynamics in simulated trips supports the potential downstream application of these models in identifying individuals with impaired balance control and increased fall risk.     

Fear and its vicissitudes

Abstract

The USA has been a changed society since 9/11: the Zeitgeist either has a background of low-level angst, or when an attack occurs or a threat is sounded, the fear peaks and comes to the foreground for a time. Perhaps nothing demonstrates the degree to which fear permeates contemporary culture more than the continual presence of the measures the USA takes to be safe: airport security, the Patriot Act, the mining of formerly private information by the government, to name but a few. Can we account for the pervasive nature of fear solely by the devastating and deadly attacks 15 years ago, unspeakably horrifying though they were? This paper will explore this omnipresent fear in contemporary American culture from a psychoanalytic perspective, and in so doing hopes to shed light on the nature of that fear, why it is so persistent despite 15 years without any sequels, and what the consequences of that fear are for the American way of life. The discussion will be rounded out by linking this pervasive fear to the violence that is endemic to our age.     

Preventive Wars, Just War Principles, and the United Nations

This paper explores the question of whether the United Nations should engage in preventive military actions. Correlatively, it asks whether UN preventive military actions could satisfy just war principles. Rather than from the standpoint of the individual nation state, the ethics of preventive war is discussed from the standpoint of the UN. For the sake of brevity, only the legitimate authority, just cause, last resort, and proportionality principles are considered. Since there has been disagreement about the specific content of these principles, a third question also is explored: How should they be formulated? Moreover, these questions are addressed in the context of a particular issue: the goals of the non-proliferation and the abolition of weapons of mass destruction.     

The analyst: His professional novel1

The psychoanalyst needs to be in touch with a community of colleagues; he needs to feel part of a group with which he can share cognitive tension and therapeutic knowledge. Yet group ties are an aspect we analysts seldom discuss. The author defi nes the analyst's ‘professional novel’ as the emotional vicissitudes with the group that have marked the professional itinerary of every analyst; his relationship with institutions and with theories, and the emotional nuance of these relationships. The analyst's professional novel is the narrative elaboration of his professional autobiography. It is capable of transforming the individual's need to belong and the paths of identifi cation and deidentifi cation. Experience of the oedipal confi guration allows the analyst to begin psychic work aimed at gaining spaces of separateness in his relationship with the group. This passage is marked by the work on mourning that separation involves, but also of mourning implicit in the awareness of the representative limits of our theories. Right from the start of analysis, the patient observes the emotional nuance of the analyst's connection to his group and theories; the patient notices how much this connection is governed by rigid needs to belong, and how much freedom of thought and exploration it allows the analyst. The author uses clinical examples to illustrate these hypotheses.     

The effects of body mass index and waist-to-hip ratio on ratings of female attractiveness, fecundity, and health

This paper examines the effects of body mass index (BMI) and waist-to-hip ratio (WHR) on people’s perceptions of female attractiveness and fecundity. One hundred and two participants (51 females) were asked to rate 18 line drawings, varying across three BMI and six WHR levels, on seven different attributes (‘healthy’, ‘fertile’, ‘youthful’, ‘intelligent’, ‘nurturing’, ‘flirty’, and ‘attractive’). Line drawings manipulated arm and leg thickness while keeping torso WHR consistent, thus unconfounding previously confounded variables. The data were analysed through a doubly multivariate analysis of variance. Effect sizes were larger for BMI than for WHR. Figures of average weight and a WHR of 0.7 were rated as most attractive and healthy. Overall, the results demonstrate that the effects of BMI and WHR on perceptions of attractiveness and fecundity are interdependent and should be studied concurrently rather than in isolation.     

社会心理学角度分析群体性事件综述

群体性事件作为我国社会转型时期的一个突出问题,近年来受到广泛关注。本文对近十年来从社会心理学角度研究群体性事件的相关文献进行梳理整合,总结归纳出三个重要方面,并对相关研究的不足之处提出了疑问和建议,以期对当前类似事件的应对有所借鉴及对后继研究有所启示。     

神经肌肉下意识前馈与反馈控制的知觉线索效应

为研究视觉和时间知觉线索对突发外部姿势干扰下中枢神经系统对动作肌肉和姿势肌肉预期姿势调节(APAs)和补偿姿势调节(CPAs)的影响, 本研究被试分别在视觉和时间线索引导下完成经典落球试验, 同步采集右侧动作肌肉肱二头肌和姿势肌肉腰部竖脊肌和腰部多裂肌的sEMG信号, 计算被检肌肉APAs发生率、预激活时间和CPAs反应强度。结果发现, 视觉线索可以引发动作肌肉和姿势肌肉APAs发生率明显增加, 预激活时间明显提前, 以及动作肌肉CPAs反应强度明显减小; 而时间线索主要引发动作肌肉预激活提前, 对姿势肌肉APAs和CPAs无明显影响。该结果表明, 视觉和时间引导线索对突发外部姿势干扰条件下人体姿势肌肉和动作肌肉的中枢运动控制具有不同的作用。视觉引导线索能够明显增加姿势肌肉和动作肌肉预激活发生率和提早预激活时间, 表现出明显的“视觉线索预激活优势现象”; 而时间引导线索主要引发动作肌肉预激活提前, 对姿势肌肉APAs和CPAs无明显影响。     

Numeral Classifiers and the White Horse Paradox

This paper presents an interpretation of Gongsun Long＇s white horse paradox. The Chinese sentence he uses to state his main thesis （Bai ma fei ma） has two potential readings： （a） The white horses are not horses. （b） The white horses are not the horses Although （a） gives the usual and correct reading of the sentence, according to the interpretation, Gongsun Long takes it to state （b）. He gives good arguments for （b） while taking them to establish （a） as well, for he fails to distinguish between the two different theses. In presenting this interpretation, the paper gives an account of the function of numeral classifiers and discusses the semantics of count nouns in languages with no grammatical number system, including classical Chinese and classifier languages （e.g., contemporary Chinese）.     

‘Minimal Religion’ and Mikhail Epstein’s Interpretation of Religion in Late-Soviet and Post-Soviet Russia

This is an examination of two essays on minimal religion by Mikhail Epstein (1982 and 1999), assessing the usefulness of the term ‘minimal religion’ for the analysis of religion in contemporary Russia. An adapted version of a paper delivered at the School of Slavonic and East European Studies (SSEES), University of London, on 8 December, 2003. Note regarding Mikhail Epstein’s use of the words ‘religion’, ‘religiosity’ and ‘spirituality’: Epstein uses the word ‘religion’ to signify ‘mainstream’, church-based manifestations of religion and also the institutional, hierarchical structures related to those. Although in English usage the word ‘religiosity’ has negative connotations – signifying either a superficially felt religious sentiment or a somehow false and insincere expression of religious feeling, intended for outward show – Epstein appears to use the term entirely neutrally. For him it simply serves as a synonym for the word ‘spirituality’. In the two essays examined in the present article the word ‘spirituality’ signifies the whole inner spiritual life and aspirations of the individual and her/his reflection on an ethical way of living, whether the person concerned is a committed, church-going believer, or someone engaged in a personal spiritual or philosophical quest for meaning, or else someone who has experienced what Epstein refers to as ‘the wilderness’ of the Soviet years and has learnt of a spiritual dimension to life through that formative experience.