Sociology

Morality

Injustice

Conviction

Solidarity

Politics

Social identity theory

Ingroups and outgroups

Epistemology

Philosophy

Political science

Social group

Psychology

Individualism

Collective action

Disadvantaged

Social psychology

Collectivism

Psychological Bulletin

Sociopsychological theorizing and research on collective action (e.g., social protests) has mushroomed over the last decade, studying a wide variety of groups, contexts, and cultures. Through a quantitative research synthesis of four motivations for collective action (1,235 effects from 403 samples; total N = 123,707), we summarize and synthesize this body of research into the dual chamber model, a comprehensive and potentially cross-cultural model of collective action. We aim to replicate previous meta-analytic conclusions (about identity, injustice, and efficacy) and break new theoretical ground by (a) integrating a fourth motivation (morality) into the very heart of the psychology of collective action, (b) extending these four motivations to advantaged group members acting in solidarity with the disadvantaged, and (c) integrating theoretically relevant structural (i.e., cultural and other contextual) constraints. Results substantiated the dual chamber model as all four motivations yielded unique, positive, medium-sized effects and interrelationships were positive (particularly among morality and identity, conceptualized as the dual chambers of the protester's beating heart). Meta-analytic structural equation modeling supported the added value of including morality. Moreover, findings confirmed that the strongest specific motivations were emotional injustice and politicized identification, while newly adding moral conviction to that list. Finally, the four motivations extended to advantaged group members acting in solidarity with the disadvantaged, while only the identity motivation was constrained by theoretically relevant cultural dimensions and values (e.g., collectivism and hierarchy). We discuss the implications and limitations of the dual chamber model for integrative theorizing, innovative research, and the practice of collective action. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Toward a comprehensive and potentially cross-cultural model of why people engage in collective action: A quantitative research synthesis of four motivations and structural constraints.