Crowdsourcing hypothesis tests: Making transparent how design choices shape research results

To what extent are research results influenced by subjective decisions that scientists make as they design studies? Fifteen research teams independently designed studies to answer fiveoriginal research questions related to moral judgments, negotiations, and implicit cognition. Participants from two separate large samples (total N > 15,000) were then randomly assigned to complete one version of each study. Effect sizes varied dramatically across different sets of materials designed to test the same hypothesis: materials from different teams renderedstatistically significant effects in opposite directions for four out of five hypotheses, with the narrowest range in estimates being d = -0.37 to +0.26. Meta-analysis and a Bayesian perspective on the results revealed overall support for two hypotheses, and a lack of support for three hypotheses. Overall, practically none of the variability in effect sizes was attributable to the skill of the research team in designing materials, while considerable variability was attributable to the hypothesis being tested. In a forecasting survey, predictions of other scientists were significantly correlated with study results, both across and within hypotheses. Crowdsourced testing of research hypotheses helps reveal the true consistency of empirical support for a scientific claim.</div

To which world regions does the valence–dominance model of social perception apply?

Over the past 10 years, Oosterhof and Todorov’s valence–dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgements of faces. Because this model has primarily been developed and tested in Western regions, it is unclear whether these findings apply to other regions. We addressed this question by replicating Oosterhof and Todorov’s methodology across 11 world regions, 41 countries and 11,570 participants. When we used Oosterhof and Todorov’s original analysis strategy, the valence–dominance model generalized across regions. When we used an alternative methodology to allow for correlated dimensions, we observed much less generalization. Collectively, these results suggest that, while the valence–dominance model generalizes very well across regions when dimensions are forced to be orthogonal, regional differences are revealed when we use different extraction methods and correlate and rotate the dimension reduction solution

A multi-country test of brief reappraisal interventions on emotions during the COVID-19 pandemic.

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about a situation. Participants from 87 countries and regions (n = 21,644) were randomly assigned to one of two brief reappraisal interventions (reconstrual or repurposing) or one of two control conditions (active or passive). Results revealed that both reappraisal interventions (vesus both control conditions) consistently reduced negative emotions and increased positive emotions across different measures. Reconstrual and repurposing interventions had similar effects. Importantly, planned exploratory analyses indicated that reappraisal interventions did not reduce intentions to practice preventive health behaviours. The findings demonstrate the viability of creating scalable, low-cost interventions for use around the world

Self-gravity: Individuals Struggle to Change their Perceived Personality in a First Impression

People are motivated to change aspects of their personality traits and psychological research seems to document its regular occurrence. Nevertheless, most research has focused on whether people self-report that their personality traits have changed. Personality change is more than self-determined, however: People hope that changes to their personality are visible to others as well. Across seven studies, I therefore investigated whether people’s attempts to change their Big Five personality in a first impression are successful, focusing especially on extraversion. My work demonstrates that (i) individuals’ personality traits remain robustly visible in a first impression regardless of attempts to change, (ii) acting experience does not improve this ability, (iii) individuals’ traits can affect their evaluations more strongly than their attempts to change, and (iv) people attempting to change their personality in a first impression are largely unaware of how others truly judge them. This work therefore suggests that people struggle to control how their traits are perceived by others in a first impression.Ph.D

Testing the Sensorimotor Fluency Account of Mimicry

Mimicry is a pervasive and ubiquitous human behaviour with generally positive consequences, resulting in increased liking, closeness, and smoothness between interaction partners. Whereas previous research has stressed the affiliative aspect of these consequences, recent research suggests that these consequences may also arise because of the sensorimotor fluency with which mimicry is achieved. I tested three key hypotheses of this model in two experiments and found no support for a sensorimotor fluency account of mimicry. Implications of this research are discussed.M.A