On the Physical Origins of Inverted Optic Images

In the behavioral sciences, discussions of vision often carry an implicit assumption that the formation of inverted optic images is a result of human technology (i.e., cameras) or biological mechanisms (i.e., the chambered eye). If this assumption were true, then inverted images would be—in effect—an invention of living things, which, in turn, would have important consequences for our understanding of the evolution and psychology of vision. In this article, I briefly review the history of ideas relating vision and optics to the formation of inverted optic images. I then evaluate the necessary and sufficient conditions for the formation of inverted images. I demonstrate that inverted optic images (including inverted optic flow) can and do form in the absence of any biology and that sufficient conditions for inverted image formation predate the origins of life. Inverted images are not an invention of biological systems; rather, biological systems and human technologies exploit preexisting facts of physical optics. This conclusion is consistent with the ecological premise that life is coherent with physical law.     

Routine Integration Strategies and their Effects on Volleyball Serve Performance and Players’ Movement Mental Representation

The aim of the study was to investigate the influence of two different routine integration strategies on volleyball float-serve performance, and on the structure of players’ mental representations. Thirty female players participated in our study. One group trained routines using imagery, another group trained using the method of routines introduction, and the third group acted as control group. Players’ imagery ability, hand and ball velocity, serve accuracy, and players’ movement mental representation were assessed. The imagery group served significantly more accurate with significantly increased ball velocity, and players’ movement mental representation covered more clearly these of the experts.     

Defining and Contextualizing Robust Sport-Confidence

This study provided a systematic qualitative examination of robust sport-confidence. A focus group (2 male and 2 female participants), and follow-up interviews, with 16 (8 male and 8 female participants) elite individual sport performers, were conducted to define and contextualize the characteristics of robust sport-confidence. Data analysis procedures resulted in a definition of robust sport-confidence and the identification of 6 characteristics of robust sport-confidence. The characteristics abstracted were: multidimensional, malleable, durable, strength of belief, developed, and protective. Overall, robust sport-confidence was conceptualized as a multidimensional set of enduring positive beliefs. Future research and practical implications are discussed.     

Stance Width Influences Postural Stability and Motion Sickness

We examined the influence of stance width (the distance between the feet) on postural sway and visually induced motion sickness. Stance width influences the magnitude of body sway, and changes in sway precede the subjective symptoms of motion sickness. Thus, manipulation of stance width may influence motion sickness incidence. Participants (healthy young adults) were exposed to complex, low-frequency oscillation of a moving room. Participants stood with their feet 5 cm, 17 cm, or 30 cm apart. During exposure to visual motion, the widest stance (30 cm) was associated with reduced incidence of motion sickness. For all stance widths, motion sickness was preceded by significant changes in motion of the head and torso. The results support the postural instability theory of motion sickness and suggest practical implications for the prevention of motion sickness. Adoption of wider stance may decrease the risk of motion sickness in operational situations.     

The Relationships of Perceived Motivational Climate to Cohesion and Collective Efficacy in Elite Female Teams

The purpose of this study was to examine the relationships of perceived motivational climate to cohesion and collective efficacy in elite female teams. A total of 124 basketball and handball athletes completed two season measures (T1, T2). Relationships were examined at an individual level both statically and across time. Canonical correlations revealed that a combination of high perceptions of an ego-involving but low perceptions of a task-involving climate were associated with low perceptions of task cohesion at Time 1. High perceptions of a task-involving but low perceptions of an ego-involving climate were associated with higher perceptions of task cohesion and collective efficacy at Time 2. Moreover, low perceptions of an ego-involving and moderately low perceptions of a task-involving climate were associated with high perceptions of social cohesion at Time 2. Regression analyses including autoregressive influence indicated that a task-involving climate positively predicted variance in T2 group integration-task and collective efficacy after controlling for T1 scores. In contrast, an ego-involving climate negatively predicted changes in T2 athletes’ perceptions of social cohesion (individual attractions to the group-social [ATG-S], group integration-social [GI-S]) and group integration-task [GI-T] after controlling for T1 scores. Theoretical and practical implications are discussed.     

Sources and Types of Confidence Identified by World Class Sport Performers

This study identified the sources and types of confidence salient to 14 (7 male, 7 female) successful World Class athletes. Nine sources of confidence were identified: Preparation, performance accomplishments, coaching, innate factors, social support, experience, competitive advantage, self-awareness, and trust. A testament to the multi-dimensional nature of sport confidence, six types of sport confidence were also identified: skill execution, achievement, physical factors, psychological factors, superiority to opposition, and tactical awareness. Gender was related to both the sources of confidence and the subsequent types of confidence experienced by the athletes. For example, females placed more importance on good personal performances than males who derived confidence from winning. Results were discussed in the context of previous sport confidence literature and implications for sport psychology and coaching practices were drawn.     

Anxiety Responses and Psychological Skill Use During the Time Leading up to Competition: Theory to Practice I

This study investigated temporal responses associated with competitive anxiety in athletes with facilitative and debilitative interpretations of their anxiety symptoms. Qualitative interviews assessed the intensity, frequency, and direction of cognitive and somatic symptoms experienced during a 7-day competitive cycle and the psychological strategies used to attain/maintain a positive psychological state. Analysis indicated three distinct temporal phases within the competitive cycle during which the intensity and frequency of cognitive and somatic symptoms increased. The facilitators utilized a refined repertoire of psychological skills to internally control and re-interpret the cognitive and somatic symptoms experienced. The debilitators did not possess this refined repertoire of psychological skills and relied on external strategies to stabilize the negative symptoms experienced. The findings emphasize the dynamic properties of the stress response and provide a framework for the structure, timing, and content of psychological skills interventions for use with performers who interpret anxiety symptoms as debilitative.     

Tales of Plagues and Carnivals: Samuel R. Delany, AIDS, and the Grammar of Dissent

While even today lesbian, gay, bisexual and transgender people might have cause to distrust the healthcare establishment, how much more fragile was the relationship between sexual minorities and health professionals in the first decade of the AIDS epidemic. Dissent from consensus healthcare and health research then was a question of survival in the face of political and medical intransigence. This article focuses on one version of AIDS dissent: The narrative representations of AIDS in fiction by the gay African-American fantasy writer Samuel R. Delany, which rejected the rigid binarism of “safe” and “unsafe” sex practices, Delany’s evidence-based dissent. He also engaged in a related form of cultural dissent: speaking the unspeakably obscene, at a time when Silence?=?Death. Delany called into question both the inferential leaps based on limited epidemiological research that were represented in safer sex guidelines and the widespread public reticence about sexual behavior.