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51.
Vanda Correia Duarte Araújo Keith Davids Orlando Fernandes Sofia Fonseca 《Psychology of sport and exercise》2011,12(6):662-669
Background and objective
Field invasion games, such as rugby union, can be conceptualised as dynamic social systems in which the agents continuously interact to contest ball possession and territorial gain. Accordingly, this study aimed to identify the collective system dynamics of rugby union phases-of-play near the try line by investigating whether ball displacement trajectory on the playing field provides insights on successful team performance.Methods
Five rugby union matches were videotaped involving teams at a national league performance level. From these matches, 22 second phases-of-play were selected and digitized for analysis. The variable “distance gained” was investigated as a potential coordination variable describing functional coordination between players and teams. This variable concerned the distance between ball initial position and ball current position over time and was used to define the degree of territory gained by an attacking team.Results
Analysis of distance gained dynamics in attacking sub-phases demonstrated the intermittent character of rugby union performers displacement trajectories on the playing field. Amplitude of ball movements was revealed as a distinguishing feature related to attacking effectiveness. Successful attacking phases displayed lower distances of positional retreat, with the maximum retreat distance achieved sooner in successful compared to unsuccessful phases-of-play. Autocorrelation and ApEn analyses suggested low system variability within time series data concerning both performance outcomes. However, evidence of less regularity and more complexity was found in unsuccessful phases-of-play.Conclusion
Results suggested that distance gained dynamics manifests a characteristic collective behaviour pattern that captures the macroscopic functional order of multi-player attack–defence systems in team sports like rugby union. 相似文献52.
本研究以600名农民工为被试,采用自编的农民工感知社会支持情景问卷以及修订的自尊量表、农民工主观幸福感问卷,以探讨农民工感知社会支持、自尊与主观幸福感的关系,并考查农民工自尊在其感知社会支持与主观幸福感之间的中介作用。结果表明:(1)高自尊水平农民工的主观幸福感及其各维度、感知社会支持都极其显著地高于低自尊农民工;(2)自尊水平与主观幸福感及各维度、感知社会支持水平之间存在极其显著的正相关关系;(3)感知社会支持、自尊与主观幸福感显著两两正相关;(4)自尊在感知社会支持基础上对主观幸福感及两个维度回归效应显著,为二者之间重要的中介变量。 相似文献
53.
基于等级反应模型的规则空间方法 总被引:1,自引:0,他引:1
本研究基于Tatsuoka的规则空间方法, 对理想反应模式与异常反应指标进行了扩展, 推导了多级评分项目下规则空间方法的算法公式。在4种属性层级结构(发散型、收敛型、线型与无结构型)×4种“失误”作答概率(2%、5%、10%与15%)测验情境下, 以属性模式判准率、被试属性判准率、敏感性与特异性为指标, 检验了多级评分项目下规则空间方法的分类准确性。结果表明:(1) 基于多级评分项目构建的异常反应指标, 能有效地对被试进行分类与解释, 且0-1评分项目下异常反应指标及其性质都是多级评分下的特例; (2) 随着“失误”作答概率的增加, 4种属性层级结构的分类准确性都会降低; (3) 线型和收敛型的分类准确性明显好于发散型与无结构型; (4) 纯规则点的分布对规则空间方法的分类准确性有显著影响。 相似文献
54.
55.
In three experiments, a rat's lever presses could postpone timeouts from food pellets delivered on response-independent schedules. In Experiment 1, the pellets were delivered at variable-time (VT) rates ranging from VT 0.5 to VT 8 min. Experiment 2 replicated the VT 1 min and VT 8 min conditions of Experiment 1 with new subjects. Finally, subjects in Experiment 3 could postpone timeouts from delivery of pellets that differed in quality rather than quantity (unsweetened versus sweetened pellets). In general, response rates and success in avoiding increased as a function of the rate and quality of the pellets. Also, performance efficiency increased as the experiments progressed, that is, the avoidance response occurred later and later in the response-timeout interval. The results support the conclusion that timeout from reinforcement has functional properties similar to those of more commonly studied aversive stimuli (e.g., shock). 相似文献
56.
Selection of Variables in Cluster Analysis: An Empirical Comparison of Eight Procedures 总被引:1,自引:0,他引:1
Eight different variable selection techniques for model-based and non-model-based clustering are evaluated across a wide range
of cluster structures. It is shown that several methods have difficulties when non-informative variables (i.e., random noise)
are included in the model. Furthermore, the distribution of the random noise greatly impacts the performance of nearly all
of the variable selection procedures. Overall, a variable selection technique based on a variance-to-range weighting procedure
coupled with the largest decreases in within-cluster sums of squares error performed the best. On the other hand, variable
selection methods used in conjunction with finite mixture models performed the worst. 相似文献
57.
本文以中介语的历时变化和共时变化为视角,归纳和分析了中介语多变性的不同语言能力变化论和不同环境语言运用变化论;并从学习者的语言运用环境和交际对象、学习方式和在语言运用中对语言形式的注意程度等方面,对解释中介语多变性的不同观点进行了评介。最后,从联结的角度对中介语本质特性进行了分析。 相似文献
58.
Takayuki Tanno Alan Silberberg Takayuki Sakagami 《Journal of the experimental analysis of behavior》2009,91(2):157-167
Food‐deprived rats in Experiment 1 responded to one of two tandem schedules that were, with equal probability, associated with a sample lever. The tandem schedules' initial links were different random‐interval schedules. Their values were adjusted to approximate equality in time to completing each tandem schedule's response requirements. The tandem schedules differed in their terminal links: One reinforced short interresponse times; the other reinforced long ones. Tandem‐schedule completion presented two comparison levers, one of which was associated with each tandem schedule. Pressing the lever associated with the sample‐lever tandem schedule produced a food pellet. Pressing the other produced a blackout. The difference between terminal‐link reinforced interresponse times varied across 10‐trial blocks within a session. Conditional‐discrimination accuracy increased with the size of the temporal difference between terminal‐link reinforced interresponse times. In Experiment 2, one tandem schedule was replaced by a random ratio, while the comparison schedule was either a tandem schedule that only reinforced long interresponse times or a random‐interval schedule. Again, conditional‐discrimination accuracy increased with the temporal difference between the two schedules' reinforced interresponse times. Most rats mastered the discrimination between random ratio and random interval, showing that the interresponse times reinforced by these schedules can serve to discriminate between these schedules. 相似文献
59.
Mark G. Ehrhart Karen Holcombe Ehrhart Scott C. Roesch Beth G. Chung-Herrera Kristy Nadler Kelsey Bradshaw 《Personality and individual differences》2009,47(8):900-905
Recent efforts have aimed to develop relatively short measures of the Five-Factor Model (FFM) of personality, particularly for when time and/or space is limited. We evaluate the Ten-Item Personality Inventory (TIPI), a non-proprietary FFM measure with two items per dimension. We use a latent variable methodology to examine the TIPI’s factor structure and convergent validity with the 50-item International Personality Item Pool (IPIP) FFM measure. We provide correlations between the scale scores and latent factors, and compare each measure’s pattern of correlations with measures of other individual difference constructs. Results were favorable in terms of the factor structure and convergent validity of the TIPI, particularly regarding the correlations between the respective latent factors of the TIPI and the IPIP–FFM measures. 相似文献
60.
从“情境因素”和“过程因素”两个方面对整合式谈判影响因素的研究动态和研究成果进行了归纳和分析。其中“情境因素”是指在正式谈判一开始时就已经存在的因素,主要包括:(1)谈判者的文化价值观,如个人主义与集体主义、权力距离和沟通的高、低语境;(2)社会动机,研究谈判组的动机构成如何影响谈判过程和结果;(3)情绪因素,研究谈判中的积极情绪、消极情绪各自对达成整合式谈判的影响。对“过程因素”的研究考察了谈判沟通的过程,包括谈判过程中各种策略的使用频次、次序和谈判各个阶段的策略使用情况 相似文献