On Association Coefficients for 2×2 Tables and Properties That Do Not Depend on the Marginal Distributions

We discuss properties that association coefficients may have in general, e.g., zero value under statistical independence, and we examine coefficients for 2×2 tables with respect to these properties. Furthermore, we study a family of coefficients that are linear transformations of the observed proportion of agreement given the marginal probabilities. This family includes the phi coefficient and Cohen’s kappa. The main result is that the linear transformations that set the value under independence at zero and the maximum value at unity, transform all coefficients in this family into the same underlying coefficient. This coefficient happens to be Loevinger’s H.     

When,why, and how do People Deviate from Physical Distancing Measures During the COVID-19 Pandemic: A Mixed-Methods Study

Introduction:To limit the spread of COVID-19, many countries, including Belgium, have installed physical distancing measures. Yet, adherence to these newly installed behavioral measures has been described as challenging and effortful. Based on the Health Action Process Approach (HAPA) model, this study performed an in-depth evaluation of when, why, and how people deviated from the physical distancing measures.Methods:An online mixed-method study was conducted among Belgian adults (N = 2055) in the beginning of May 2020. Participants were recruited via an open call through email and social media platforms, using snowball sampling. Conditions wherein people deviated from the physical distancing measures were assessed by means of an open-ended question. HAPA determinants were assessed in a quantitative way.Results:Half of the sample reported to deviate from the measures. Further, deviation from the measures was associated with each determinant outlined by the HAPA. Findings highlight that many people deviated from the measures because of their need for social contact. The majority of the people who deviated from the measures stated that they carefully weighed the risks of their behavior.Conclusions:Need for social contact pushed people to deviate from physical distancing measures in a deliberate manner. Potential areas for future interventions aimed at promoting adherence to physical distancing measures and enhancing psychosocial well-being are discussed.     

The influence of facial attractiveness on imitation

People judge, evaluate, and treat attractive people better than moderately attractive or unattractive people [Langlois, J. H., Kalakanis, L., Rubenstein, A. J., Larson, A., Hallam, M., & Smoot, M. (2000). Maxims or myths of beauty? A meta-analytic and theoretical review. Psychological Bulletin, 126, 390–423]. The fact that individuals like attractive people combined with the finding that individuals imitate the ones they like, suggests that they may be more prone to imitate attractive people. The present research extends previous work on attractiveness and imitation by examining this hypothesis. Using a novel coloring procedure, we show that attractive females are imitated more than unattractive females (Experiment 1) and that attractive males are imitated more than unattractive males (Experiment 2). Importantly, this imitation occurs without any direct or anticipated contact with the target individual and without awareness of the influence of attractiveness on imitation behavior.     

Effects of social value orientation on expecting and learning others' orientations

The influence of an individual's own social value orientation on the orientation expected from others and on the learning of others' social orientations was examined. The subjects (N = 148) were classified according to theirown social value orientation. The orientations they generally expected from others were assessed as well. Each subject learned the choices of five other persons, representing the orientations altruism, cooperation, equality, individualism, and competition. With respect to subjects' expectations of others' orientations the triangle hypothesis was not fully supported: only individualists expected their orientation in high frequencies. The false consensus hypothesis received more support. Generally an orientation was expected more frequently by subjects who themselves had that particular orientation than by subjects with other orientations. With regard to the learning of others' orientations support was found for the predictions derived from the triangle and the false consensus hypothesis. Cooperators and individualists were the best overall learners, followed by egalitarian and maximum subjects, and at the lowest level competitors. In addition, nearly every orientation was learned better by subjects who had that orientation than by subjects with a different orientation.     

Causal attribution and self-justification as explanations for the consensus expectation of one's social value orientation

This study focuses on explanations for the perceived consensus of one's own social value orientation. The prediction of the triangle hypothesis that the consensus expectation of individualistic and competitive people is higher than that of cooperative people was partially supported. Only individualists expected their own orientation more frequently of other people. According to a causal attribution explanation, it was expected that subjects' causal attributions for their own orientation to internal and external causes influenced their consensus expectations. Only attributions to internal causes differed significantly between subjects with different orientations and corresponded with their consensus estimates. Individualism was attributed least internally, cooperation most internally, and competition in between. Additionally, direct support for the effect of internal attributions on consensus expectations was found. Compared with subjects who attributed their own orientation more internally, subjects who attributed it less internally were more likely to expect their own orientation among other people. According to a self-justification explanation, it was hypothesized that the consensus expectations of individualists and competitors would be higher when first their own social orientation was assessed and then the orientation they expected to predominate among others than in the reversed order. This hypothesis was not supported.     

Individual differences in dopamine efflux in nucleus accumbens shell and core during instrumental learning

Combined activation of dopamine D1- and NMDA-glutamate receptors in the nucleus accumbens has been strongly implicated in instrumental learning, the process in which an individual learns that a specific action has a wanted outcome. To assess dopaminergic activity, we presented rats with two sessions (30 trials each) of a one-lever appetitive instrumental task and simultaneously measured dopamine efflux in the shell and core accumbens subareas using in vivo microdialysis. Dopamine efflux was increased during each session in all areas. The behavioral performance of the rats in the second session led us to divide them into a learning group (>90% correct trials) and a non-learning group. In the first session, the rats of the learning group showed significantly higher increases. The difference was most pronounced in the shell. In the second session, the dopamine increase was similar in both groups, although the learning groups now pressed the lever about three times more often and consequently obtained more rewards. We conclude that task-related activation of dopamine efflux is different between learning and non-learning rats only during the learning phase. These results support the pharmacological evidence that dopamine is of particular importance during the instrumental learning process.     

Perceived consensus of one's social value orientation in different populations in public and private circumstances

The present research examined the influence of subjects' own social value orientation, private or public circumstances, and whether the target population was specific or general on the frequency that subjects expected their own orientation among other people. In this way, the generality of the triangle hypothesis was evaluated by varying subjects‘ identifiability and the target populations’ specificity. In accordance with the triangle hypothesis, pro-self people expected their orientation more frequently than pro-social people. As predicted by the three-tiered theory of opinion formation, subjects expected their orientation more often in public than in private circumstances. Furthermore, the triangle hypothesis was supported for the general population, but not for the specific population. In addition, support was found for the false consensus hypothesis, as subjects of each social orientation expected the occurrence of their orientation more frequently than others did. The results make new interpretations possible of previous research into the triangle hypothesis.     

A Predictive Approach to Nonparametric Inference for Adaptive Sequential Sampling of Psychophysical Experiments

We present a predictive account on adaptive sequential sampling of stimulus-response relations in psychophysical experiments. Our discussion applies to experimental situations with ordinal stimuli when there is only weak structural knowledge available such that parametric modeling is no option. By introducing a certain form of partial exchangeability, we successively develop a hierarchical Bayesian model based on a mixture of Pólya urn processes. Suitable utility measures permit us to optimize the overall experimental sampling process. We provide several measures that are either based on simple count statistics or more elaborate information theoretic quantities. The actual computation of information theoretic utilities often turns out to be infeasible. This is not the case with our sampling method, which relies on an efficient algorithm to compute exact solutions of our posterior predictions and utility measures. Finally, we demonstrate the advantages of our framework on a hypothetical sampling problem.     

Working memory benefits creative insight, musical improvisation, and original ideation through maintained task-focused attention

Anecdotes from creative eminences suggest that executive control plays an important role in creativity, but scientific evidence is sparse. Invoking the Dual Pathway to Creativity Model, the authors hypothesize that working memory capacity (WMC) relates to creative performance because it enables persistent, focused, and systematic combining of elements and possibilities (persistence). Study 1 indeed showed that under cognitive load, participants performed worse on a creative insight task. Study 2 revealed positive associations between time-on-task and creativity among individuals high but not low in WMC, even after controlling for general intelligence. Study 3 revealed that across trials, semiprofessional cellists performed increasingly more creative improvisations when they had high rather than low WMC. Study 4 showed that WMC predicts original ideation because it allows persistent (rather than flexible) processing. The authors conclude that WMC benefits creativity because it enables the individual to maintain attention focused on the task and prevents undesirable mind wandering.