The Emergence of 'Us and Them' in 80 Lines of Code: Modeling Group Genesis in Homogeneous Populations

Kurt  Gray; David G. Rand; Eyal  Ert; Kevin  Lewis; Steve  Hershman; Michael I. Norton

Article | Psychological Science | April 2014

The Emergence of 'Us and Them' in 80 Lines of Code: Modeling Group Genesis in Homogeneous Populations

by Kurt Gray, David G. Rand, Eyal Ert, Kevin Lewis, Steve Hershman and Michael I. Norton

Abstract

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 use game-theoretical agent-based models to explore group genesis in homogeneous populations and find robust group formation with just two basic principles: reciprocity and transitivity. These emergent groups demonstrate in-group cooperation and out-group defection, even though agents lack common identity. Group formation increases individual payoffs, and group structure is robust to varying levels of reciprocity and transitivity. Increasing population size increases group size more than group number, and manipulating baseline trust in a population has predictable effects on group genesis. An interactive online demonstration enables first-hand exploration of the parameter space (www.mpmlab.org/groups), and available source code (supplementary materials) provides a guide to implementing psychological agent-based models.

Keywords: Groups and Teams;

Format: Print

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Citation:

Gray, Kurt, David G. Rand, Eyal Ert, Kevin Lewis, Steve Hershman, and Michael I. Norton. "The Emergence of 'Us and Them' in 80 Lines of Code: Modeling Group Genesis in Homogeneous Populations." Psychological Science 25, no. 4 (April 2014): 982–990.

Emotional expression in digital form has become increasingly ubiquitous via the proliferation of computers and handheld devices. Using online surveys and live chat experiments across four studies and 1,325 individuals (Study 1A-B and 2A-B), and a large social media dataset spanning 4.9 billion individuals (Study 3), we examine whether digital emotion expression (emojis) predicts happiness at the individual and national levels. Our studies converge on three central findings. First, people use emojis in text-based communication to convey emotional experience. Second, the amount and diversity of emojis causally increases happiness during social interactions. Third, across 122 countries, higher total amount and greater diversity of emoji usage per capita and per user correlate with higher national happiness. Across levels of analysis, our results suggest that both the amount and diversity of digital emotion expression influences well-being.

Working Paper | HBS Working Paper Series | 2018

Backhanded Compliments: How Negative Comparisons Undermine Flattery

Ovul Sezer, Alison Wood Brooks and Michael I. Norton

Seven studies (N = 2352) examine backhanded compliments—seeming praise that draws a comparison with a negative standard—a distinct self-presentation strategy with two simultaneous goals: eliciting liking (“Your speech was good…”) and conveying status (“…for a woman”). Backhanded compliments are common, from delivering feedback in work settings to communicating in casual conversation and take several distinct forms (Studies 1a-b). Backhanded compliments have mixed effectiveness, as people who deliver backhanded compliments erroneously believe that they will both convey high status and elicit liking (Studies 2a-2b), but recipients and third-party evaluators grant them neither (Studies 3a-3b); however, backhanded compliments are successful in reducing recipients’ motivation (Study 3c). We identify two constructs useful in determining the general effectiveness of ingratiation: excessive concern with image drives negative perceptions of backhanded compliment givers, while perceptions of low relative rank in a distribution drives the reduced motivation of backhanded compliment recipients.

Keywords: backhanded compliments; Self-presentation; impression management; interpersonal perception; liking; Status; image concern; Interpersonal Communication; Status and Position; Perception; Motivation and Incentives;

Citation:

Sezer, Ovul, Alison Wood Brooks, and Michael I. Norton. "Backhanded Compliments: How Negative Comparisons Undermine Flattery." Harvard Business School Working Paper, No. 18-082, February 2018. View Details

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The Emergence of 'Us and Them' in 80 Lines of Code: Modeling Group Genesis in Homogeneous Populations

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