A taxometric analysis of actual Internet sports gambling behavior

This article presents findings from the first taxometric study of actual gambling behavior to determine whether we can represent the characteristics of extreme gambling as qualitatively distinct (i.e., taxonic) or as a point along a dimension. We analyzed the bets made during a 24-month study period by the 4,595 most involved gamblers among a cohort of 48,114 people using an Internet service to gamble on sporting events. We applied two taxometric procedures (i.e., MAMBAC and MAXCOV) to three indicators of betting behavior: total money lost, total number of bets, and total money wagered. The results fail to provide support for the view that the most involved Internet sports gamblers include a distinct category of gamblers. More research is necessary to clarify the similar features of recreational and extreme gamblers and the dimensions that scientists can use to measure these behaviors. Finally, we discuss the implications of these findings for clinical, research, and public policy activities.     

Emotion Socialization in the Context of Family Risks: Links to Child Emotion Regulation

The current study expands upon the extant literature by examining the influence of contextual risk factors (e.g., parental psychological distress, household income, educational attainment) on parental responses to children’s emotional experiences. Participants included 97 ethnically and demographically diverse mother–child dyads with children ranging in age from 7 to 12. Mothers reported indicators of supportive and unsupportive emotion socialization practices, and measures of child emotion regulation and emotion dysregulation. Higher scores on the familial risk index were positively related to increased emotion dysregulation and negatively related to decreased emotion regulation through mediated effects of mothers’ unsupportive reactions to children’s negative emotional expressions. These findings suggest the importance of considering contextual influences on the emotion socialization process and offer potential avenues to foster adaptive emotional development in the context of high risk.     

Phosphodiesterase type 5 (PDE5) inhibition improves object recognition memory: indications for central and peripheral mechanisms

A promising target for memory improvement is phosphodiesterase type 5 (PDE5), which selectively hydrolyzes cyclic guanosine monophosphate (cGMP). In rodents, PDE5 inhibitors (PDE5-Is) have been shown to improve memory performance in many behavioral paradigms. However, it is questioned whether the positive effects in animal studies result from PDE5 inhibition in the central nervous system or the periphery. Therefore, we studied the effects of PDE5 inhibition on memory and determined whether compound penetration of the blood-brain barrier (BBB) is required for this activity. Two selective PDE5-Is, vardenafil and UK-343,664, were tested in the object recognition task (ORT) in both a MK-801- and scopolamine-induced memory deficit model, and a time-delay model without pharmacological intervention. Compounds were dosed 30 min before the learning trial of the task. To determine if the PDE5-Is crossed the BBB, their concentrations were determined in plasma and brain tissue collected 30 min after oral administration. Vardenafil improved object recognition memory in all three variants of the ORT. UK-343,664 was ineffective at either preventing MK-801-induced memory disruption or time-dependent memory decay. However, UK-343,664 attenuated the memory impairment of scopolamine. Vardenafil crossed the BBB whereas UK-343,664 did not. Further, co-administration of UK-343,664 and scopolamine did not alter the brain partitioning of either molecule. This suggests that the positive effect of UK-343,664 on scopolamine-induced memory decay might arise from peripheral PDE5 inhibition. The results herein suggest that there may be multiple mechanisms that mediate the efficacy of PDE5 inhibition to improve memory performance in tasks such as the ORT and that these involve PDE5 located both within and outside of the brain. To further elucidate the underlying mechanisms, the cellular and subcellular localization of PDE5 needs to be determined.     

Slope estimation and viewing distance of the observer

The overestimation of geographical slant is one of the most sizable visual illusions. However, in some cases estimates of close-by slopes within the range of the observer’s personal space have been found to be rather accurate. We propose that the seemingly diverse findings can be reconciled when taking the viewing distance of the observer into account. The latter involves the distance of the observer from the slope (personal space, action space, and vista space) and also the eye-point relative to the slope. We separated these factors and compared outdoor judgments to those collected with a three-dimensional (3D) model of natural terrain, which was within arm’s reach of the observer. Slope was overestimated in the outdoors at viewing distances between 2 m and 138 m. The 3D model reproduced the errors in monocular viewing; however, performance was accurate with stereoscopic viewing. We conclude that accurate slant perception breaks down as soon as the situation exits personal space, be it physically or be it by closing one eye.     

Mind the Gap: Framing of Women’s Success and Representation in STEM Affects Women’s Math Performance under Threat

Interventions designed to combat the negative effects of stereotype threat have primarily taken an individual-based approach. The current study sought to expand upon these strategies by taking a group-based approach to reduce stereotype threat effects. Specifically, we investigated whether the success and numerical representation of women in STEM positively impacts women’s math performance and affective reactions. We hypothesized that 1) women under threat (control) would perform worse than men; 2) there would be a larger performance difference for women than men when exposed to the success and balanced representation of women in STEM compared to the control condition; 3) there would be a larger performance difference for women than men between the balanced condition and the unbalanced condition where women are portrayed as successful, but not equally represented in STEM. For this study, male (n?=?56) and female (n?=?66) U.S. undergraduates from a large southern California state university read information about women’s success and representation in STEM (or no information), completed a math exam under stereotype threat conditions, and then expressed their threat-based concerns. Results revealed that women performed worse than men in the control condition. Women in the balanced condition performed better than women in the control and unbalanced conditions. Men’s performance was unaffected by the balance or imbalance of women in STEM. Women’s affective reactions largely mirrored the performance results. This study provides compelling evidence for using a group-based approach highlighting women’s advances in STEM to alleviate stereotype threat.     

Multiplicity,directional (type III) errors,and the null hypothesis

L. V. Jones and J. W. Tukey (2000) pointed out that the usual 2-sided, equal-tails null hypothesis test at level alpha can be reinterpreted as simultaneous tests of 2 directional inequality hypotheses, each at level alpha/2, and that the maximum probability of a Type I error is alpha/2 if the truth of the null hypothesis is considered impossible. This article points out that in multiple testing with familywise error rate controlled at alpha, the directional error rate (assuming all null hypotheses are false) is greater than alpha/2 and can be arbitrarily close to alpha. Single-step, step-down, and step-up procedures are analyzed, and other error rates, including the false discovery rate, are discussed. Implications for confidence interval estimation and hypothesis testing practices are considered.     

Gender-Role Congruence and Self-Referencing as Determinants of Advertising Effectiveness

In an initial experiment, men and women with varied gender-role orientations evaluated gender-stereotyped and nonstereotyped advertisements for gendered products that are actually used by both sexes. Consistent with a gender-role congruence model of advertising effectiveness, traditional participants (masculine men; feminine women) responded more favorably to traditional (i.e., gender-stereotyped) than to nontraditional advertisements, whereas nontraditional participants (androgynous individuals; feminine men; masculine women) reacted somewhat more favorably to the nontraditional advertisements. Experiment 2 revealed that when encouraged to self reference, traditional participants became much more responsive to nontraditional advertisements, even more so than were the nontraditional participants. Practical implications of these results are discussed.