Extracting Agency and Communion From the Big Five: A Four-Way Competition

Agency and communion are the two fundamental content dimensions in psychology. The two dimensions figure prominently in many psychological realms (personality, social, self, motivational, cross-cultural, etc.). In contemporary research, however, personality is most commonly measured within the Big Five framework. We developed novel agency and communion scales based on the items from the most popular nonpropriety measure of the Big Five-the Big Five Inventory. We compared four alternative scale-construction methods: expert rating, target scale, ant colony, and brute force. Across three samples (N_total = 942), all methods yielded reliable and valid agency and communion scales. Our research provides two main contributions. For psychometric theory, it extends knowledge on the four scale-construction methods and their relative convergence. For psychometric practice, it enables researchers to examine agency and communion hypotheses with extant Big Five Inventory data sets, including those collected in their own labs as well as openly accessible, large-scale data sets.

Microaggressions and Daily Experience

Psychologists use the term microaggressions to describe subtle forms of bias and discrimination experienced by members of marginalized groups. Lilienfeld (2017, this issue) makes an important contribution to the literature by presenting a critical review of the meaning and measurement of microaggression experiences. In this commentary, we argue that advancing the construct of microaggressions rests on research approaches that move beyond static representations of individuals to dynamic frameworks that observe people's lives as they unfold day to day. We discuss the conceptual potential of microaggressions as a bridging concept across multiple levels of analysis. We conclude that the intensive study of individuals over time can contribute to theory evaluation and offer new insights into the nature of unfolding processes that are theorized to be central to the manifestation of microaggressions in everyday life.

The Emergence of “Us and Them” in 80 Lines of Code

Psychological explanations of group genesis often require population heterogeneity in identity or other characteristics, whether deep (e.g., religion) or superficial (e.g., eye color). We used agent-based models to explore group genesis in homogeneous populations and found robust group formation with just two basic principles: reciprocity and transitivity. These emergent groups demonstrated in-group cooperation and out-group defection, even though agents lacked common identity. Group formation increased individual payoffs, and group number and size were robust to varying levels of reciprocity and transitivity. Increasing population size increased group size more than group number, and manipulating baseline trust in a population had predictable effects on group genesis. An interactive demonstration of the parameter space and source code for implementing the model are available online.