Why walkers slip: shine is not a reliable cue for slippery ground

In a series of four studies, we investigated the visual cues that walkers use to predict slippery ground surfaces and tested whether visual information is reliable for specifying low-friction conditions. In Study 1, 91% of participants surveyed responded that they would use shine to identify upcoming slippery ground. Studies 2-4 confirmed participants' reliance on shine to predict slip. Participants viewed ground surfaces varying in gloss, paint color, and viewing distance under indoor and outdoor lighting conditions. Shine and slip ratings and functional walking judgments were related to surface gloss level and to surface coefficient of friction (COF). However, judgments were strongly affected by surface color, viewing distance, and lighting conditions--extraneous factors that do not change the surface COF. Results suggest that, although walkers rely on shine to predict slippery ground, shine is not a reliable visual cue for friction. Poor visual information for friction may underlie the high prevalence of friction-related slips and falls.     

Perceiving External Things and the Time‐Lag Argument

Abstract: We seem to directly perceive external things. But can we? According to the time‐lag argument, we cannot. What we directly perceive happens now. There is a time‐lag between our perceptions and the external things we seem to directly perceive; these external things happen in the past; thus, what we directly perceive must be something else, for example, sense‐data, and we can only at best indirectly perceive other things. This paper examines the time‐lag argument given contemporary metaphysics. I argue that this argument is not as compelling as it may initially seem. First, it denies that what we directly perceive can ever be what it seems to be; second, it conflicts with the current physical conception of time, relativity theory. This latter point leads to a more general one: the argument's force depends on a particular metaphysical conception on time, presentism, which is controversial in contemporary metaphysics of time. Given the alternative conception, eternalism, the argument is much less compelling. The overall argument of this paper, then, is that, if one wishes to hold that we directly perceive external things, we should subscribe to the latter view of time, i.e., eternalism.     

Prevalence of Anxiety and Depression in Australian Adolescents: Comparisons with Worldwide Data

Data from two Australian studies were combined so that the prevalence of anxiety and depression in a large, normative sample of Australian adolescents could be investigated. The combined sample comprised 1,299 adolescents randomly selected from metropolitan and country schools in Melbourne, a large Australian city. The data were examined in order to ascertain the percentages of adolescents who scored above the clinical cut-off on two self-report instruments-the Revised Children's Manifest Anxiety Scale (C. R. Reynolds & B. 0. Richmond, 1985) and the Reynolds Adolescent Depression Scale (W. M. Reynolds, 1986). The results of these analyses were then compared with previously reported prevalence rates from studies worldwide. This comparison revealed striking differences in the prevalence of anxiety and depression across different countries and cultures. Limitations attributable to different self-report measures and imposed-etic approaches are discussed. Issues pertaining to social and political climate are also raised.     

Well-Being, Quality of Life, and the Naïve Pursuit of Happiness

The pursuit of happiness is a long-enshrined tradition that has recently become the cornerstone of the American Positive Psychology movement. However, “happiness” is an over-worked and ambiguous word, which, it is argued, should be restricted and only used as the label for a brief emotional state that typically lasts a few seconds or minutes. The corollary proposal for positive psychology is that optimism is a preferable stance over pessimism or realism. Examples are presented both from psychology and economics that illustrate the dangers of optimism, and in which better outcomes can occur with a pessimistic stance. A more sophisticated approach is then presented in which, in relation to well-being and quality of life, neither optimism nor pessimism is seen as inherently better than the other, but, rather, in which psychological flexibility may contribute optimally to health and well-being.     

Fairness lies in the heart of the beholder: How the social emotions of third parties influence reactions to injustice

The present research explores third parties’ (e.g., jurors, ombudsmen, auditors, and employees observing others’ encounters) ability to objectively judge fairness. More specifically, the current research suggests that third parties’ justice judgments and reactions are biased by their attitudes toward the decision recipient and, in particular, the affective aspect of those attitudes as characterized by their felt social emotions. We explore how the congruence of a social emotion (i.e., the extent to which the emotion reflects feeling a subjective sense of alignment with the target of the emotion) can influence their evaluations of recipients’ decision outcomes. The five studies presented show that congruence can lead third parties to react positively to objectively unfair decision outcomes and, importantly, that the influence of social emotions on subjective justice judgments drive third party reactions to decisions, decision makers, and even national policies.     

Ecosystemic Structural Family Therapy: Theoretical and Clinical Foundations

Ecosystemic structural family therapy (ESFT) is a systemic, strength-based, and trauma-informed family therapy model that has evolved from structural family therapy (SFT; Minuchin in Families and family therapy, Harvard University Press, Cambridge, 1974). ESFT is an evidenced-based family therapy approach designed to intervene with families of children who are experiencing behavioral health problems and are at the risk of out-of-home placement. In this article we review the theoretical, applied, and empirical evolution of ESFT relative to extant SFT models. ESFT is based on the fundamental assumption that child, parental, and marital functioning are inextricably linked to their relational environment. Five interrelated constructs guide ESFT therapists in their understanding of clinical problems: family structure; family and individual emotional regulation; individual differences (e.g., historical, biological, cultural, developmental); affective proximity; and family development (Gehart 2010). ESFT has an extensive evaluation history dating back to the 1980s involving over 4,000 families in 39 different sites. While ESFT is considered evidence-based, it might be more consistent with “Practice-Based Evidence” given its long, extensive, and successful, history in the child mental health system in Pennsylvania.     

Models of data and theoretical hypotheses: a case-study in classical genetics

Linkage (or genetic) maps are graphs, which are intended to represent the linear ordering of genes on the chromosomes. They are constructed on the basis of statistical data concerning the transmission of genes. The invention of this technique in 1913 was driven by Morgan’s group’s adoption of a set of hypotheses concerning the physical mechanism of heredity. These hypotheses were themselves grounded in Morgan’s defense of the chromosome theory of heredity, according to which chromosomes are the physical basis of genes. In this paper, I analyze the 1919 debate between William Castle and Morgan’s group, about the construction of genetic maps. The official issue of the debate concerns the arrangement of genes on chromosomes. However, the disputants tend to carry out the discussions about how one should model the data in order to draw predictions concerning the transmission of genes; the debate does not bear on the data themselves, nor does it focus on the hypotheses explaining these data. The main criteria that are appealed to by the protagonists are simplicity and predictive efficacy. However, I show that both parties’ assessments of the simplicity and predictive efficacy of different ways of modeling the data themselves depend on background theoretical positions. I aim at clarifying how preference for a given model and theoretical commitments articulate.