Moral foundations theory
Moral foundations theory is a social psychological theory intended to explain the origins of and variation in human moral reasoning on the basis of innate, modular foundations. It was first proposed by the psychologists Jonathan Haidt, Craig Joseph and Jesse Graham, building on the work of cultural anthropologist Richard Shweder; and subsequently developed by a diverse group of collaborators, and popularized in Haidt's book The Righteous Mind. The theory proposes six foundations: Care/Harm, Fairness/Cheating, Loyalty/Betrayal, Authority/Subversion, Sanctity/Degradation, and Liberty/Oppression; while its authors remain open to the addition, subtraction or modification of the set of foundations.(pp104–107)
Although the initial development of moral foundations theory focused on cultural differences, subsequent work with the theory has largely focused on political ideology. Various scholars have offered moral foundations theory as an explanation of differences among political progressives (liberals in the American sense), conservatives, and libertarians, and have suggested that it can explain variation in opinion on politically charged issues such as same sex marriage and abortion.
The two main sources are The Pragmatic Validity of Moral Pluralism and Mapping the Moral Domain. In the first Haidt and Graham describe their work as looking, as anthropologists, at the evolution of morality and finding the common ground between each variation. In the second they describe and defend their method, known as the Moral Foundations Questionnaire. Through studies that jointly consisted of over 11,000 people, from a variety of ages and political beliefs, they found results that supported their prediction.
Moral foundations theory was first proposed in 2004 by Haidt and Joseph. The theory emerged as a reaction against the developmental rationalist theory of morality associated with Lawrence Kohlberg and Jean Piaget. Building on Piaget's work, Kohlberg argued that children's moral reasoning changed over time, and proposed an explanation through his six stages of moral development. Kohlberg's work emphasized justice as the key concept in moral reasoning, seen as a primarily cognitive activity, and became the dominant approach to moral psychology, heavily influencing subsequent work. Haidt writes that he found Kohlberg's theories unsatisfying from the time he first encountered them in graduate school because they "seemed too cerebral" and lacked a focus on issues of emotion.
In contrast to the dominant theories of morality in psychology, the anthropologist Richard Shweder developed a set of theories emphasizing the cultural variability of moral judgments, but argued that different cultural forms of morality drew on "three distinct but coherent clusters of moral concerns", which he labeled as the ethics of autonomy, community, and divinity. Shweder's approach inspired Haidt to begin researching moral differences across cultures, including fieldwork in Brazil and Philadelphia. This work led Haidt to begin developing his social intuitionist approach to morality. This approach, which stood in sharp contrast to Kohlberg's rationalist work, suggested that "moral judgment is caused by quick moral intuitions" while moral reasoning simply serves as a post-hoc rationalization of already formed judgments. Haidt's work and his focus on quick, intuitive, emotional judgments quickly became very influential, attracting sustained attention from an array of researchers.
As Haidt and his collaborators worked within the social intuitionist approach, they began to devote attention to the sources of the intuitions that they believed underlay moral judgments. In a 2004 article published in the journal Daedalus, Haidt and Joseph surveyed works on the roots of morality, including the work of Frans de Waal, Donald Brown and Shweder, as well as Alan Fiske's relational models theory and Shalom Schwartz's Theory of Basic Human Values. From their review of these earlier lines of research, they suggested that all individuals possess four "intuitive ethics", stemming from the process of human evolution as responses to adaptive challenges. They labelled these four ethics as suffering, hierarchy, reciprocity, and purity.
Invoking the notion of preparedness, Haidt and Joseph claimed that each of the ethics formed a cognitive module, whose development was shaped by culture. They wrote that each module could "provide little more than flashes of affect when certain patterns are encountered in the social world", while a cultural learning process shaped each individual's response to these flashes. Morality diverges because different cultures utilize the four "building blocks" provided by the modules differently. Their Daedalus article became the first statement of moral foundations theory, which Haidt, Graham, Joseph, and others have since elaborated and refined, for example by splitting the originally proposed ethic of hierarchy into the separate moral foundations of ingroup and authority, and by proposing a tentative sixth foundation of liberty.
The main five foundations
According to Moral Foundations Theory, differences in people's moral concerns can be described in terms of five moral foundations:
- Care: cherishing and protecting others; opposite of harm
- Fairness or proportionality: rendering justice according to shared rules; opposite of cheating
- Loyalty or ingroup: standing with your group, family, nation; opposite of betrayal
- Authority or respect: submitting to tradition and legitimate authority; opposite of subversion
- Sanctity or purity: abhorrence for disgusting things, foods, actions; opposite of degradation
These five foundations are argued to group into two higher-order clusters – the person-focused Individualizing cluster of Care and Fairness, and the group-focused Binding cluster of Loyalty, Authority and Sanctity. The empirical evidence favoring this grouping comes from patterns of associations between the moral foundations observed with the Moral Foundations Questionnaire.
The liberty foundation
A sixth foundation, liberty (opposite of oppression) was theorized by Jonathan Haidt in The Righteous Mind, chapter eight, in response to the need to differentiate between proportionality fairness and the objections he had received from conservatives and libertarians (United States usage) to coercion by a dominating power or person. Haidt noted that the latter group's moral matrix relies almost entirely on the liberty foundation. The evolutionary roots of the liberty foundation are theorized to lie in "hypervigilance of egalitarian hunter–gatherers for any sign of alpha male behavior, including boasting."(p2117)
Additional candidate foundations
Moral Foundations Questionnaire
A large amount of research on Moral Foundations Theory uses self-report instruments such as the Moral Foundations Questionnaire, formally published in 2011 (though earlier versions of the questionnaire had already been published). Subsequent investigations using the Moral Foundations Questionnaire in other cultures have found broadly similar correlations between morality and political identification to those of the US, with studies taking place in Korea, Sweden and New Zealand. However, other studies suggest that the structure of the MFQ is inconsistent across demographic groups (e.g., comparing religious and non-religious and Black and White respondents) and across cultures.
Other materials and methods used to study Moral Foundations Theory include the Moral Foundations Sacredness Scale, Moral Foundations Vignettes, the Socio-Moral Image Database, and Character Moral Foundations Questionnaire. Research on moral language use have also relied on variants of a Moral Foundations Dictionary. Researchers have also examined the topographical maps of somatosensory reactions associated with violations of different moral foundations. Specifically, in a study where participants were asked to describe key aspects of their subjective somatosensory experience in response to scenarios involving various moral violations, body patterns corresponding to violations of moral foundations were felt in different regions of the body depending on whether participants were liberal or conservative.
Researchers have found that people's sensitivities to the five/six moral foundations correlate with their political ideologies. Using the Moral Foundations Questionnaire, Haidt and Graham found that libertarians are most sensitive to the proposed Liberty foundation, liberals are most sensitive to the Care and Fairness foundations, while conservatives are equally sensitive to all five/six foundations.
According to Haidt, the differences have significant implications for political discourse and relations. Because members of two political camps are to a degree blind to one or more of the moral foundations of the others, they may perceive morally driven words or behavior as having another basis—at best self-interested, at worst evil, and thus demonize one another.
Haidt and Graham suggest a compromise can be found to allow liberals and conservatives to see eye-to-eye. They suggest that the five foundations can be used as "doorway" to allow liberals to step to the conservative side of the "wall" put up between these two political affiliations on major political issues (i.e. legalizing gay marriage). If liberals try to consider the latter three foundations in addition to the former two (therefore adopting all five foundations like conservatives for a brief amount of time) they could understand where the conservatives' viewpoints stem from and long-lasting political issues could finally be settled.
Researchers postulate that the moral foundations arose as solutions to problems common in the ancestral hunter-gatherer environment, in particular intertribal and intra-tribal conflict. The three foundations emphasized more by conservatives (Loyalty, Authority, Sanctity) bind groups together for greater strength in intertribal competition while the other two foundations balance those tendencies with concern for individuals within the group. With reduced sensitivity to the group moral foundations, progressives tend to promote a more universalist morality.
The usefulness of moral foundations theory as an explanation for political ideology has been contested on the grounds that moral foundations are less heritable than political ideology, and longitudinal data suggest that political ideology predicts subsequent endorsement of moral foundations, but moral foundations endorsement does not predict subsequent political ideology.
Haidt's initial field work in Brazil and Philadelphia in 1989, and Odisha, India in 1993, showed that moralizing indeed varies among cultures, but less than by social class (e.g. education) and age. Working-class Brazilian children were more likely to consider both taboo violations and infliction of harm to be morally wrong, and universally so. Members of traditional, collectivist societies, like political conservatives, are more sensitive to violations of the community-related moral foundations. Adult members of so-called WEIRD (western, educated, industrialized, rich, and democratic) societies are the most individualistic, and most likely to draw a distinction between harm-inflicting violations of morality and violations of convention.
A recent large-scale (N = 336,691) analysis of sex differences based on the five moral foundations suggested that women consistently score higher on care, fairness, and purity across 67 cultures. However, loyalty and authority were shown to have negligible sex differences, highly variable across cultures. This study, published in 2020 in Proceedings of the Royal Society B, also examined country-level sex differences in moral foundations in relation to cultural, socioeconomic, and gender-related indicators revealing that global sex differences in moral foundations are larger in individualistic, Western, and gender-equal cultures. Examining multivariate sex differences in the five moral foundations (i.e. Mahalanobis' D as well as its disattenuated bias-corrected version) in moral judgements, the authors concluded that multivariate effects were substantially larger than previously estimated sex differences in moral judgements using non-MFT frameworks and, more generally, the median effect size in social and personality psychology research. Mahalanobis' D of the five moral foundations were significantly larger in individualist and gender-equal countries.
Critiques and competing theories
A number of researchers have offered critiques of, and alternative theories to, Moral Foundations Theory. Critiques of the theory have included claims of biological implausibility and redundancy among the moral foundations (which are argued to be reducible to concern about harm). Both critiques have been disputed by the original authors. Alternative theories include the Model of Moral Motives, the Theory of Dyadic Morality, Relationship Regulation Theory, the right-wing authoritarianism scale developed by Bob Altemeyer, and the theory of Morality As Cooperation.
- Haidt, Jonathan; Craig Joseph (Fall 2004). "Intuitive ethics: how innately prepared intuitions generate culturally variable virtues" (PDF). Daedalus. 133 (4): 55–66. doi:10.1162/0011526042365555. S2CID 1574243. Archived from the original (PDF) on 2016-09-09. Retrieved 2012-10-13.
- Graham, J.; Haidt, J.; Koleva, S.; Motyl, M.; Iyer, R.; Wojcik, S.; Ditto, P.H. (2013). Moral Foundations Theory: The pragmatic validity of moral pluralism (PDF). Advances in Experimental Social Psychology. 47. pp. 55–130. doi:10.1016/b978-0-12-407236-7.00002-4. ISBN 9780124072367. Archived from the original (PDF) on 2017-07-31. Retrieved 2017-03-08.
- Graham, Jesse; Haidt, Jonathan; Motyl, Matt; Meindl, Peter; Iskiwitch, Carol; Mooijman, Marlon (2018). "Moral Foundations Theory: On the advantages of moral pluralism over moral monism". In Gray, Kurt; Graham, Jesse (eds.). The Atlas of Moral Psychology: Mapping Good and Evil in the Mind. New York: Guilford Press. pp. 211–222.
- Shweder, Richard; Much, Nancy; Mahapatra, Manamohan; Park, Lawrence (1997). "The "big three" of morality (autonomy, community, divinity) and the "big three" explanations of suffering.". In Brandt, Allan; Rozin, Paul (eds.). Morality and Health. Routledge. pp. 119–169.
- Haidt, Jonathan (2012). The Righteous Mind: Why Good People are Divided By Politics and Religion. New York: Pantheon Books. pp. 9–11. ISBN 978-0-307-37790-6.
- Iyer, Ravi; Koleva, Spassena; Graham, Jesse; Ditto, Peter; Haidt, Jonathan (2012). "Understanding Libertarian Morality: The Psychological Dispositions of Self-Identified Libertarians". PLOS ONE. 7 (8): e42366. Bibcode:2012PLoSO...742366I. doi:10.1371/journal.pone.0042366. PMC 3424229. PMID 22927928.
- Graham, Jesse; Haidt, Jonathan; Nosek, Brian A. (2009). "Liberals and conservatives rely on different sets of moral foundations". Journal of Personality and Social Psychology. 96 (5): 1029–1046. doi:10.1037/a0015141. PMID 19379034. S2CID 2715121.
- Koleva, Spassena P.; Graham, Jesse; Iyer, Ravi; Ditto, Peter H.; Haidt, Jonathan (April 2012). "Tracing the threads: How five moral concerns (especially Purity) help explain culture war attitudes". Journal of Research in Personality. 46 (2): 184–194. doi:10.1016/j.jrp.2012.01.006.
- Graham, Jesse; Nosek, Brian A.; Haidt, Jonathan; Iyer, Ravi; Koleva, Spassena; Ditto, Peter H. (2011). "Mapping the moral domain" (PDF). Journal of Personality and Social Psychology. 101 (2): 366–385. doi:10.1037/a0021847. PMC 3116962. PMID 21244182. Archived from the original (PDF) on 2017-08-09. Retrieved 2017-03-08.
- Haidt, Jonathan (October 2001). "The Emotional Dog and Its Rational Tail: A Social Intuitionist Approach to Moral Judgement" (PDF). Psychological Review. 108 (4): 814–34. CiteSeerX 10.1.1.620.5536. doi:10.1037/0033-295x.108.4.814. PMID 11699120. Archived from the original (PDF) on 2016-07-29. Retrieved 2012-10-13.
- Donleavy, Gabriel (July 2008). "No Man's Land: Exploring the Space between Gilligan and Kohlberg". Journal of Business Ethics. 80 (4): 807–822. doi:10.1007/s10551-007-9470-9. JSTOR 25482183. S2CID 55981823.
- Shweder, Richard; Jonathan Haidt (November 1993). "Commentary to Feature Review: The Future of Moral Psychology: Truth, Intuition, and the Pluralist Way". Psychological Science. 4 (6): 360–365. doi:10.1111/j.1467-9280.1993.tb00582.x. JSTOR 40062563. S2CID 143483576.
- Haidt, Jonathan; Koller, Silvia Helena; Dias, Maria G. (1993). "Affect, culture, and morality, or is it wrong to eat your dog?". Journal of Personality and Social Psychology. 65 (4): 613–628. doi:10.1037/0022-35188.8.131.523. PMID 8229648. S2CID 27964255.
- Miller, Greg (9 May 2008). "The Roots of Morality". Science. 320 (5877): 734–737. doi:10.1126/science.320.5877.734. PMID 18467565. S2CID 19803255.
- Fiske, Alan P. (1992). "The four elementary forms of sociality: Framework for a unified theory of social relations". Psychological Review. 99 (4): 689–723. doi:10.1037/0033-295X.99.4.689. PMID 1454904.
- Schwartz, Shalom H. (1992), "Universals in the Content and Structure of Values: Theoretical Advances and Empirical Tests in 20 Countries", Advances in Experimental Social Psychology Volume 25, Advances in Experimental Social Psychology, 25, Elsevier, pp. 1–65, CiteSeerX 10.1.1.220.3674, doi:10.1016/s0065-2601(08)60281-6, ISBN 9780120152254
- Haidt, Jonathan; Joseph, Craig (2007). "The moral mind: How five sets of innate intuitions guide the development of many culture-specific virtues, and perhaps even modules". In Carruthers, P; Laurence, S; Stich, S (eds.). The Innate Mind, Volume 3: Foundations and the Future. Oxford University Press. pp. 367–391. doi:10.1093/acprof:oso/9780195332834.003.0019. ISBN 9780195332834.
- Haidt, Jonathan; Graham, Jesse (2009). "Planet of the Durkheimians, where community, authority, and sacredness are foundations of morality". In Jost, John; Kay, Aaron; Thorisdottir, Hulda (eds.). Social and psychological bases of ideology and system justification. Oxford University Press. pp. 371–401. ISBN 9780199869541.
- Haidt, Jonathan; Joseph, Craig (September 2011). "How Moral Foundations Theory Succeeded in Building on Sand: A Response to Suhler and Churchland". Journal of Cognitive Neuroscience. 23 (9): 2117–2122. doi:10.1162/jocn.2011.21638. S2CID 8367732.
- Kim, Kisok; Je-Sang Kang; Seongyi Yun (August 2012). "Moral intuitions and political orientation: Similarities and differences between Korea and the United States". PLOS ONE. 111 (1): 173–185. doi:10.1371/journal.pone.0050092. PMC 3520939. PMID 23251357.
- Nilsson, Artur; Erlandsson, Arvid (April 2015). "The Moral Foundations taxonomy: Structural validity and relation to political ideology in Sweden". Personality and Individual Differences. 76: 28–32. doi:10.1016/j.paid.2014.11.049.
- Davies, Caitlin L.; Sibley, Chris G.; Liu, James H. (November 2014). "Confirmatory Factor Analysis of the Moral Foundations Questionnaire". Social Psychology. 45 (6): 431–436. doi:10.1027/1864-9335/a000201.
- Davis, Don E.; Dooley, Matthew T.; Hook, Joshua N.; Choe, Elise; McElroy, Stacey E. (2017). "The purity/sanctity subscale of the Moral Foundations Questionnaire does not work similarly for religious versus non-religious individuals". Psychology of Religion and Spirituality. 9 (1): 124–130. doi:10.1037/rel0000057. S2CID 151572240.
- Davis, Don E.; Rice, Kenneth; Van Tongeren, Daryl R.; Hook, Joshua N.; DeBlaere, Cirleen; Worthington, Everett L.; Choe, Elise (2016). "The moral foundations hypothesis does not replicate well in Black samples". Journal of Personality and Social Psychology. 110 (4): e23–e30. doi:10.1037/pspp0000056. PMID 26348601.
- Iurino, Kathryn; Saucier, Gerard (31 December 2018). "Testing Measurement Invariance of the Moral Foundations Questionnaire Across 27 Countries". Assessment. 27 (2): 365–372. doi:10.1177/1073191118817916. PMID 30596252. S2CID 58573774.
- Graham, Jesse; Haidt, Jonathan (2012). "Sacred values and evil adversaries: A moral foundations approach". In Mikulincer, Mario; Shaver, Phillip R (eds.). The Social Psychology of Morality: Exploring the Causes of Good and Evil. APA Books. ISBN 978-1433810114.
- Clifford, Scott; Iyengar, Vijeth; Cabeza, Roberto; Sinnott-Armstrong, Walter (13 January 2015). "Moral foundations vignettes: a standardized stimulus database of scenarios based on moral foundations theory". Behavior Research Methods. 47 (4): 1178–1198. doi:10.3758/s13428-014-0551-2. PMC 4780680. PMID 25582811.
- Marques, Lucas Murrins; Clifford, Scott; Iyengar, Vijeth; Bonato, Graziela Vieira; Cabral, Patrícia Moraes; Barreto dos Santos, Rafaela; Cabeza, Roberto; Sinnott-Armstrong, Walter; Boggio, Paulo Sérgio (2020). "Translation and validation of the Moral Foundations Vignettes (MFVs) for the Portuguese language in a Brazilian sample" (PDF). Judgment and Decision Making. 15 (1): 149–158.
- Crone, Damien L.; Rhee, Joshua J.; Laham, Simon M. (1 October 2020). "Developing brief versions of the Moral Foundations Vignettes using a genetic algorithm-based approach". Behavior Research Methods. doi:10.3758/s13428-020-01489-y.
- Crone, Damien L.; Bode, Stefan; Murawski, Carsten; Laham, Simon M. (24 January 2018). "The Socio-Moral Image Database (SMID): A novel stimulus set for the study of social, moral and affective processes". PLOS ONE. 13 (1): e0190954. doi:10.1371/journal.pone.0190954.
- Eden, Allison; Oliver, Mary Beth; Tamborini, Ron; Limperos, Anthony; Woolley, Julia (4 March 2015). "Perceptions of Moral Violations and Personality Traits Among Heroes and Villains". Mass Communication and Society. 18 (2): 186–208. doi:10.1080/15205436.2014.923462.
- Hopp, Frederic R.; Fisher, Jacob T.; Cornell, Devin; Huskey, Richard; Weber, René (14 July 2020). "The extended Moral Foundations Dictionary (eMFD): Development and applications of a crowd-sourced approach to extracting moral intuitions from text". Behavior Research Methods. doi:10.3758/s13428-020-01433-0.
- Hoover, Joe; Johnson, Kate; Boghrati, Reihane; Graham, Jesse; Dehghani, Morteza (26 April 2018). "Moral Framing and Charitable Donation: Integrating Exploratory Social Media Analyses and Confirmatory Experimentation". Collabra: Psychology. 4 (1): 9. doi:10.1525/collabra.129.
- Matsuo, Akiko; Sasahara, Kazutoshi; Taguchi, Yasuhiro; Karasawa, Minoru; Gruebner, Oliver (25 March 2019). "Development and validation of the Japanese Moral Foundations Dictionary". PLOS ONE. 14 (3): e0213343. arXiv:1804.00871. doi:10.1371/journal.pone.0213343. PMC 6433225. PMID 30908489.
- Atari, Mohammad; Mostafazadeh Davani, Aida; Dehghani, Morteza (2020-01-08). "Body Maps of Moral Concerns". Psychological Science. 31 (2): 160–169. doi:10.1177/0956797619895284. ISSN 0956-7976. PMID 31913779. S2CID 210119354.
- Jonathan Haidt, Bill Moyers (3 February 2012). Jonathan Haidt Explains Our Contentious Culture (Television production). Lebanon: Public Square Media, Inc.
- Haidt, Jonathan; Graham, Jesse (2007-06-01). "When Morality Opposes Justice: Conservatives Have Moral Intuitions that Liberals may not Recognize". Social Justice Research. 20 (1): 98–116. doi:10.1007/s11211-007-0034-z. ISSN 0885-7466. S2CID 6824095.
- Sinn, J.S.; Hayes, M.W. (2017). "Replacing the Moral Foundations: An Evolutionary‐Coalitional Theory of Liberal‐Conservative Differences". Political Psychology. 38 (6): 1043–1064. doi:10.1111/pops.12361.
- Smith, Kevin B.; Alford, John R.; Hibbing, John R.; Martin, Nicholas G.; Hatemi, Peter K. (April 2017). "Intuitive Ethics and Political Orientations: Testing Moral Foundations as a Theory of Political Ideology". American Journal of Political Science. 61 (2): 424–437. doi:10.1111/ajps.12255.
- Hatemi, Peter K.; Crabtree, Charles; Smith, Kevin B. (30 July 2019). "Ideology Justifies Morality: Political Beliefs Predict Moral Foundations". American Journal of Political Science. 63 (4): 788–806. doi:10.1111/ajps.12448.
- Henrich, Joseph; Heine, Steven J.; Norenzayan, Ara (June 2010). "The weirdest people in the world?". Behavioral and Brain Sciences. 33 (2–3): 61–83. doi:10.1017/S0140525X0999152X. PMID 20550733.
- Atari, Mohammad; Lai, Mark H. C.; Dehghani, Morteza (2020-10-28). "Sex differences in moral judgements across 67 countries". Proceedings of the Royal Society B: Biological Sciences. 287 (1937): 20201201. doi:10.1098/rspb.2020.1201.
- Schwartz, Shalom H.; Rubel, Tammy (December 2005). "Sex differences in value priorities: Cross-cultural and multimethod studies". Journal of Personality and Social Psychology. 89 (6): 1010–1028. doi:10.1037/0022-35184.108.40.2060. ISSN 1939-1315.
- Gignac, Gilles E.; Szodorai, Eva T. (2016-11-01). "Effect size guidelines for individual differences researchers". Personality and Individual Differences. 102: 74–78. doi:10.1016/j.paid.2016.06.069. ISSN 0191-8869.
- Suhler, Christopher L.; Churchland, Patricia (September 2011). "Can Innate, Modular "Foundations" Explain Morality? Challenges for Haidt's Moral Foundations Theory". Journal of Cognitive Neuroscience. 23 (9): 2103–2116. doi:10.1162/jocn.2011.21637. PMID 21291315. S2CID 538927.
- Schein, Chelsea; Gray, Kurt (14 May 2017). "The Theory of Dyadic Morality: Reinventing Moral Judgment by Redefining Harm". Personality and Social Psychology Review. 22 (1): 32–70. doi:10.1177/1088868317698288. PMID 28504021.
- Koleva, Spassena; Haidt, Jonathan (April 2012). "Let's Use Einstein's Safety Razor, Not Occam's Swiss Army Knife or Occam's Chainsaw". Psychological Inquiry. 23 (2): 175–178. doi:10.1080/1047840X.2012.667678. S2CID 145249367.
- Janoff-Bulman, Ronnie; Carnes, Nate C. (16 March 2013). "Surveying the Moral Landscape". Personality and Social Psychology Review. 17 (3): 219–236. doi:10.1177/1088868313480274. PMID 23504824. S2CID 6658383.
- Gray, Kurt; Young, Liane; Waytz, Adam (April 2012). "Mind Perception Is the Essence of Morality". Psychological Inquiry. 23 (2): 101–124. doi:10.1080/1047840X.2012.651387. PMC 3379786. PMID 22754268.
- Rai, Tage Shakti; Fiske, Alan Page (2011). "Moral psychology is relationship regulation: Moral motives for unity, hierarchy, equality, and proportionality". Psychological Review. 118 (1): 57–75. doi:10.1037/a0021867. PMID 21244187. S2CID 38453836.
- Verhulst, B.; Eaves, L. J.; Hatemi, P. K. (2012). "Correlation not causation: the relationship between personality traits and political ideologies". American Journal of Political Science. 56 (1): 34–51. doi:10.1111/j.1540-5907.2011.00568.x. PMC 3809096. PMID 22400142.
- Curry, Oliver Scott; Jones Chesters, Matthew; Van Lissa, Caspar J. (February 2019). "Mapping morality with a compass: Testing the theory of 'morality-as-cooperation' with a new questionnaire". Journal of Research in Personality. 78: 106–124. doi:10.1016/j.jrp.2018.10.008.
- Curry, Oliver Scott; Mullins, Daniel Austin; Whitehouse, Harvey (2 February 2019). "Is It Good to Cooperate? Testing the Theory of Morality-as-Cooperation in 60 Societies". Current Anthropology. 60 (1): 47–69. doi:10.1086/701478.