The nonconvergence of factals: A nonmetric common factor analysis

FACTALS is a nonmetric common factor analysis model for multivariate data whose variables may be nominal, ordinal or interval. In FACTALS an Alternating Least Squares algorithm is utilized which is claimed to be monotonically convergent.In this paper it is shown that this algorithm is based upon an erroneous assumption, namely that the least squares loss function (which is in this case a nonscale free loss function) can be transformed into a scalefree loss function. A consequence of this is that monotonical convergence of the algorithm can not be guaranteed.     

Measures of response bias at minimum-detectable luminance levels in the pigeon

Using an operant analogue of the yes-no detection task, six pigeons were trained to detect luminance changes under two different reinforcement-scheduling procedures. In the first, an uncontrolled reinforcement-ratio procedure, the relative frequency of food reinforcers obtained for correct detections was free to vary with the birds' behavior as luminance levels were changed. In the second, a controlled reinforcement-ratio procedure, changes in preference could not alter the relative distribution of food reinforcers between the two response alternatives. Extreme response biases developed as luminance was decreased to threshold in the uncontrolled procedure. No progressive changes in response bias as a function of decreasing luminance were seen in the controlled procedure. Absolute thresholds for light intensity were lower in the controlled than in the uncontrolled procedure.     

项目难度与被试能力分布最优匹配的模拟研究

该文运用蒙特卡罗方法对被测试能力分布与测验项目难度分布的匹配问题进行模拟分析,分析表明当能力分布为正态分布正偏态分布和负偏态分布时分别与测验项目难度分布与为正态分布,正偏态分布和负偏态分布匹配,比别的匹配有更高测验期望信息值,测验最大信息测验 系数,并且测验信息曲线最大值的能力点与能力分布的众数愈相一致,测验项目参数估计值性真实值的相关也更高。     

Feedback functions for variable-interval reinforcement

On a given variable-interval schedule, the average obtained rate of reinforcement depends on the average rate of responding. An expression for this feedback effect is derived from the assumptions that free-operant responding occurs in bursts with a constant tempo, alternating with periods of engagement in other activities; that the durations of bursts and other activities are exponentially distributed; and that the rates of initiating and terminating bursts are inversely related. The expression provides a satisfactory account of the data of three experiments.     

QEEG markers of superior shooting performance in skilled marksmen: An investigation of cortical activity on psychomotor efficiency hypothesis

For elite performers, psychomotor behavior's success or failure can be traced to differences in brain dynamics. The psychomotor efficiency hypothesis suggests refined cortical activity through 1) selective activation of task-relevant processes and 2) inhibition of non-essential processes. The use of electroencephalography (EEG) has been applied to investigate psychomotor performance's neural processes. The EEG markers that reflect an elevation of psychomotor efficiency include left temporal alpha (T3 alpha), frontal midline theta (Fm theta), sensorimotor rhythm (SMR), and the coherence between frontal and left temporal regions. However, the relationship between elite performers' task-relevant and non-essential neural processes is still not well understood. Therefore, this study aimed to explore how each task-relevant and inhibition of non-essential processes contribute to superior psychomotor behavior. Thirty-five highly skilled marksmen were recruited to perform 30 shots in the shooting task while the EEG was recorded. The marksmen were divided into two groups (superior & inferior) based on a median split of shooting performance. The superior group exhibited higher accuracy and precision, with a reduction in movement jerk. EEG measures revealed that the superior group exhibited higher SMR before the trigger pull than the inferior group. In addition, the superior group demonstrated reduced Fz-T3 coherence in their bull's eye shots than the missed shots. These results suggest that the superior group exhibited less effortful engagement of task-relevant processes and lower interference from non-essential cortical regions than the inferior group. The study's overall findings support the psychomotor efficiency hypothesis. When comparing highly skilled performers, the slight differences in brain dynamics ultimately contribute to the success or failure of psychomotor performance.     

Effect of parent responsiveness on young athletes’ self-perceptions and thriving: An exploratory study in a Belgian French-Community

ObjectiveThe purpose of this study was to examine the influence of parental responsive support (observed) and perceived parental responsive support on athletes’ self-perceptions and thriving.MethodsForty-one French-speaking Belgian individual sport athletes aged 12–15 years (M = 13.13, SD = 0.90) and one of their parent’s spent 10 min discussing three important athletes’ sport-related goals for the next season. The discussion was video-taped and coded to identify parents’ responsive support behaviors. After the discussion, athletes responded to a series of questionnaires measuring perceived parental responsiveness, self-efficacy, self-esteem, and thriving indicators (i.e., positive affect, vitality, life satisfaction, and health quality).ResultsThe results show that observed and perceived parental responsive support contributed to athletes’ proximal perceptions of self-efficacy. Both parental observed responsive support and athletes’ perceived parental responsiveness, mediated by athletes’ self-efficacy, were positively related to athlete’s self-esteem. Further, athletes’ perceived parental responsiveness was positively related with thriving while mediated in series by self-efficacy and self-esteem.ConclusionOverall, it appears that parents’ responsive support (observed) and athletes’ perception of responsive support are associated with positive self-perceptions and optimal wellbeing in young athletes. This study demonstrates that parents can provide responsive support to their children in the sport context. These results add further weight to suggestions that sport organizations should actively include, rather than exclude, parents in their processes.     

Weight on the bar vs. weight on the scale: A qualitative exploration of disordered eating in competitive female powerlifters

Disordered eating enquiry in sport psychology has arisen due to the need to investigate sub-clinical populations. Weight-class athletes have been found to be ‘at-risk’ of disordered eating. Therefore, interpretations of experiences can shed light on female weight-class athletes disordered eating accounts. In line with previous interpretive studies, athlete accounts can highlight unique social and cultural insights regarding disordered eating. The aim of the study was to explore disordered eating experiences of female powerlifters. One semi-structured interview was conducted with 17 participants. A thematic analysis resulted in four themes: fear of disclosing weight-cutting concerns; eating like a powerlifter; culture of regulation; and the female body vs. the powerlifter body. Findings highlighted a complex interaction between weight-cutting, the construction of disordered eating, and a female-athlete paradox within powerlifting. We anticipate findings will extend to other weight-class sports, and discuss applied implications for powerlifters' mental health and recommendations for future research.     

Defining and characterizing organizational resilience in elite sport

ObjectivesOrganizational resilience has been investigated in numerous performance contexts outside of sport, with substantial conceptual and operational variance. Given the growing interest in organizational environments in sport, the purpose of the study was to construct a definition of organizational resilience and identify resilient characteristics of elite sport organizations.DesignUsing the Delphi method, 62 expert panelists working in or with elite sport organizations (n = 45) or having academic experience of resilience in various contexts (n = 17), responded to four online iterative surveys over seven months, yielding both quantitative and qualitative data through item responses and accompanying comments. A reflexive thematic analysis of the integrated data was conducted from a critical realist standpoint.ResultsOrganizational resilience was defined as “the dynamic capability of an organization to successfully deal with significant change. It emerges from multi-level (employee, team, and organizational) interacting characteristics and processes which enable an organization to prepare for, adapt to, and learn from significant change”. The five resilient characteristics identified from the analysis were structural clarity, flexible improvement, shared understanding, reciprocal commitment, and operational awareness.ConclusionsBy proposing a definition of organizational resilience which is appropriate to and endorsed by those in elite sport organizations, and identifying resilient characteristics of elite sport organizations, this study provides an important foundation for future research and practice endeavors in this area.     

To Flourish or Languish,that is the question: Exploring the mental health profiles of Danish elite athletes

ObjectivesThe purpose of this study was (a) to investigate mental well-being and the prevalence of anxiety and depressive symptoms in Danish male and female elite athletes, (b) to identify latent profiles in athletes based on their mental health and ill health, and (c) to examine whether the different profiles vary in selected protective and risk factors concerning mental health.MethodsA total of 612 Danish athletes (M = 18.99, SD = 4.29) from 18 different sports completed an online version of the Holistic Athlete Mental Health Survey that assessed well-being, depression, and anxiety together with potential risk and protective factors (e.g., injuries, stress, sleep, social support, sport environment).ResultsOverall, 13.9% of athletes reported moderate or severe anxiety symptoms while 21.1% reported moderate or severe depressive symptoms. Female athletes had a significantly higher prevalence of anxiety and depressive symptoms and lower mental well-being scores than male athletes. Through a latent profile analysis, three distinctive mental health profiles (flourishing, moderate mental health, languishing) were discovered. MANOVA following Kruskal-Wallis tests revealed substantial differences between these profiles regarding their perception of social support, sport environment, and stressors from different life domains.Conclusions: Danish elite athletes display similar levels of anxiety and depressive symptoms as the Danish general population. Flourishing athletes report lower stress levels, receive higher support from the private and sport domain, and perceive their sport environment as more supportive than athletes who are languishing. A tailored approach is proposed to support athletes' mental health.