Sex comparisons of the bilateral deficit in proximal and distal upper body limb muscles

Bilateral deficit (BLD) describes a phenomenon that the force produced during maximal simultaneous bilateral contraction is lower than the sum of those produced unilaterally. The aim of this study was to examine the potential sex-related differences in BLD in upper body proximal and distal limb muscles. Ten men and eight women performed single-joint maximal contractions with their elbow flexors and index finger abductors at separate laboratory visits, during which the maximal isometric voluntary contractions (MVICs) were performed unilaterally and bilaterally with a randomized order in the designated muscle group. Surface electromyographic (EMG) signals were recorded from the prime movers of the designated muscle groups (biceps brachii and first dorsal interosseous) during the maximal contractions. Both men and women demonstrated BLD in their elbow flexors (deficit: men = −11.0 ± 6.3%; women = −10.2 ± 5.0%). Accompanied by this force deficit was the reduced EMG amplitude from the dominant biceps brachii (collapsed across sex: p = 0.045). For the index finger abductors, only men (deficit = −13.7 ± 6.1%), but not women showed BLD. Our results suggested that the BLD in the proximal muscle group is likely induced by the decreased maximal muscle activity from the dominant prime mover. The absence of BLD in women’s index finger muscle is largely due to the inter-subject variability possibly related to the sex hormone flux and unique levels of interhemispheric inhibition.     

合作与竞争人格倾向测量

该研究从人格的角度,采取定性与定量两种分析手段,对合作与竞争人格倾向进行了深入探讨,并编制了测量个体合作与竞争人格倾向的量表。研究者首先在深度访谈的基础上,编制合作与竞争人格倾向测量量表并进行指标验证。探索性因素分析发现,合作与竞争倾向是两个独立的维度,并分别包含三个子因子,构成合作与竞争倾向的二维度三因子模型。研究者随后对模型的验证性分析以及多重效度检验,结果显示量表的信效度与结构模型的拟合指标均达到可接受的标准     

综合性大医院与社区卫生服务中心合作切入点的分析

通过时沈阳市沈河区9个社区卫生服务中心进行调查和相关资料分析,探讨大型综合性院与社区卫生服务中心合作的可行性,如人员培训和技术支持,临床检查结果互认,实行“双向转诊”等,为建立新型城市医疗卫生服务体系参考依据。     

公共物品困境中的突显身份效应及合作动机对合作行为影响

从合作动机的激发与破坏的角度探讨公共物品困境中突显身份对合作行为的影响,同时考察社会价值取向与突显身份之间的关系。结果表明：突显合作者与突显不合作者两种方式都会提高被试的合作水平;两种突显方式的作用机制不同。突显合作者条件下,被试的合作行为受内在动机和外在动机的共同影响。而突显不合作者则会破坏被试合作的内在动机,外在动机对提高合作行为起主要作用;突显合作者条件下,合作取向的被试更多受内在动机的影响,而非合作取向的被试则更多受外在动机的影响。在突显不合作者的条件下,合作取向和非合作取向被试的合作行为都受外在动机的影响较大。     

Cooperative group learning in a team game: role of verbal exchanges among peers

Few studies concern cooperative learning in Physical Education (PE). The purpose of this experimental design was to analyze the role of verbal exchanges (discussions about the game) among peers within teams in a cooperative perspective. The participants were 17 boys and 13 girls from a French primary school (average age: 9.4 years). They were randomly assigned to two control and experimental groups. The study examined the effect of verbal exchanges on inter-personal relationships and on shooting and skill level in a team game of basketball (with adapted rules). Participants were videotaped during the games in the two groups and during discussions in the case of the experimental group. The experimental design took place during 10 physical education lessons. The results showed positive effects of discussions within each team on the skill level in the game at the deferred post-test. On the other hand, no effect was found on inter-personal relationships. These data strengthen previous findings in the theoretical cooperation framework and in the team sports domain.     

实验社会心理学中的社会困境

社会困境是指个体理性会导致集体非理性这样的情境。大量实证研究考察社会困境中合作行为的机制,然而缺乏系统的理论框架。实验室研究中所用的社会困境可以从4个方面来分类：“给-游戏”与“拿-游戏”、两人困境与多人困境、对称与非对称困境以及重复与非重复困境。综合而言,以往实验研究主要从个体差异、任务结构以及知觉与策略等3个方面考察影响社会困境的因素,这些影响因素可以整合在一个概念框架中。未来的研究尚需要联合多个学科,澄清研究变量之间的关系,并继续丰富相关概念和理论     

ON SURVIVAL OF THE FITTEST AND OTHER CORPORATE MYTHS

Although the doctrine of “survival of the fittest” is central to the Modern paradigm, it is not, as most Modernists would claim, the unvarnished truth. Indeed if we begin to think of the marketplace as a model of dynamic complexity then the logic of cooperation is inescapable. The point is that if business leaders refuse to accept that cooperation is a defining principle, not merely an abstract altruistic ideal but an essential strategy for the sustainable, long-term success of the businesses they are building, then they will continue to undermine their own best interests in the name of competitive dominance.     

Hemispheric interaction,task complexity,and emotional valence: Evidence from naturalistic images

Two experiments extend the ecological validity of tests of hemispheric interaction in three novel ways. First, we present a broad class of naturalistic stimuli that have not yet been used in tests of hemispheric interaction. Second, we test whether probable differences in complexity within the class of stimuli are supported by outcomes from measures of hemispheric interaction. Third, we use a procedure that presents target stimuli at fixation rather than at a lateralized location in order to more closely approximate normal viewing behavior.     

风险社会中公众政治信任的形成机制及影响

风险社会中如何提升公众的政治信任成为焦点。以政治信任形成的终生学习理论为基础,将理性选择理论和社会文化理论相整合,探讨影响政治信任形成的因素,以及政治信任对政治合作的影响。对291名被试进行问卷调查,层次回归结果发现：政治信任在政治透明度感知、宽容度感知和政治合作之间发挥正向中介作用;在负面认知固化程度和政治合作之间发挥负向中介作用;政治氛围感知在政治信任和政治合作行为之间起调节作用。最后,对该结果形成的原因与在现实生活中的应用进行讨论,并对未来研究的发展方向进行展望。