The History of Moral Psychology: From Moral Sense Theory to Contemporary Research

Last Updated May 28, 2026

Moral psychology has never belonged to a single discipline. Its history runs through moral philosophy, developmental psychology, social psychology, cognitive science, sociology, political theory, religious ethics, organizational research, and the empirical study of human conduct. Across that history, the core question has remained remarkably stable: how do human beings become capable of moral judgment, moral feeling, moral self-restraint, moral responsibility, moral repair, and moral failure?

What has changed is the language, method, and explanatory emphasis brought to that question. Early modern thinkers framed morality through sentiment, sympathy, conscience, reason, duty, sociability, and character. Nineteenth-century writers connected moral life to evolution, habit, civilization, and social order. Twentieth-century developmental theorists emphasized stages of judgment, rule understanding, perspective-taking, justice, and moral education. Late twentieth- and early twenty-first-century researchers turned toward intuition, cognition, emotion, social learning, disgust, cooperation, blame, neuroscience, experimental design, and cross-cultural variation. More recent work has widened the frame again, asking how politics, institutions, platforms, identity, polarization, organizational systems, and cultural power shape moral life in practice.

The history of moral psychology is therefore not a simple linear progression from error to truth. It is better understood as a series of shifts in what counts as the primary engine of moral life. At different moments, theorists have treated morality as grounded mainly in sentiment, reason, development, intuition, social learning, virtue, norms, cooperation, culture, or institutions. Each emphasis clarified something real, but each also risked reduction. The strongest contemporary view is broader: moral psychology is concerned with the full architecture of moral agency, including perception, salience, judgment, emotion, motivation, conscience, identity, character, development, responsibility, group life, and social structure.

To study this history is to see moral psychology as a field that repeatedly resists confinement. It cannot be reduced to moral philosophy, because moral life is embodied in cognition, emotion, development, behavior, and social learning. It cannot be reduced to laboratory psychology, because moral agency is formed within histories, cultures, institutions, power relations, and public narratives. It cannot be reduced to neuroscience, because brain processes do not by themselves explain obligation, dignity, responsibility, or repair. Nor can it be reduced to sociology, because individuals still perceive, feel, deliberate, choose, rationalize, resist, and act.

Moral psychology’s history is therefore a history of widening explanation. It begins with philosophical questions about sentiment, reason, sympathy, virtue, and conscience. It moves through developmental questions about children, rules, justice, care, and moral education. It expands into social-cognitive questions about learning, self-regulation, disengagement, and blame. It then enters experimental, neuroscientific, and cross-cultural research on intuition, emotion, cooperation, punishment, and moral disagreement. Today, the field increasingly studies moral agency inside systems: organizations, institutions, platforms, political identities, bureaucracies, and global cultural conflict.

The result is not a rejection of earlier traditions. It is a layered inheritance. Hume and Smith remain important because they saw moral life as affective and social. Kantian and rationalist traditions remain important because moral agency involves principle and obligation. Piaget and Kohlberg remain important because moral understanding develops. Gilligan and care ethics remain important because relationship and vulnerability cannot be treated as secondary. Bandura remains important because people can harm others while preserving a moral self-image. Haidt, Greene, and contemporary experimental researchers remain important because intuition, affect, cognition, and conflict shape moral judgment. Current work on culture, politics, institutions, and power matters because morality is lived in structured worlds.

Why the History of Moral Psychology Matters

The history of moral psychology matters because the field’s present debates are not new. They are inherited in revised form. Contemporary disputes about intuition and reasoning echo older disputes between sentimentalists and rationalists. Current work on empathy, care, and perspective-taking revisits questions first sharpened in theories of sympathy and later transformed by feminist ethics and developmental psychology. Research on moral judgment, blame, and responsibility carries forward older philosophical concerns about agency and obligation. Work on moral disengagement, dehumanization, and institutional ethics extends long-standing questions about how people reconcile harm with self-respect.

Historical awareness prevents the field from mistaking a current method for the whole subject. A laboratory experiment may reveal something important about judgment, but moral life is not exhausted by experimentally controlled dilemmas. A philosophical theory may clarify principle, but moral life is not exhausted by principle. A developmental stage model may explain some changes in justification, but moral maturity is not exhausted by verbal reasoning. A neuroscientific study may identify processes of affect and control, but moral responsibility cannot be reduced to activation patterns.

The field’s history also shows why moral psychology is strongest when it keeps multiple levels of analysis in view. Moral agency involves bodies, brains, emotions, concepts, habits, families, peers, schools, religions, professions, legal systems, political identities, organizations, media environments, and institutions. A person judges, but not from nowhere. A person feels guilt, but guilt is socially taught and culturally interpreted. A person reasons, but reasoning uses inherited languages of duty, harm, care, sin, dignity, rights, honor, loyalty, or justice. A person acts, but action unfolds inside incentives, constraints, risks, roles, and consequences.

Studying the history of moral psychology therefore helps discipline the field against reduction. It shows that sentiment matters, but not sentiment alone. Reason matters, but not reason alone. Development matters, but not development alone. Intuition matters, but not intuition alone. Institutions matter, but not institutions alone. The history of the field is a record of partial truths becoming too narrow and then being widened by later work.

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Early Origins: Moral Philosophy as the Study of Human Nature

The prehistory of moral psychology lies in an older understanding of moral philosophy as the study of human nature. In early modern thought, moral philosophy did not mean only normative ethics in the narrow contemporary sense. It often referred more broadly to the science of human conduct, passion, judgment, sociability, character, obligation, and self-command. This older framing matters because it reminds us that the division between psychology and ethics is historically recent. Earlier moral philosophers regularly treated moral life as inseparable from the study of mind.

Thinkers such as David Hume did not treat morality as detachable from passions, habits, social life, or the conditions under which human beings become responsive to others. Moral life was not imagined only as the application of rules. It was also the formation of sentiments, the cultivation of sympathy, the experience of approval and disapproval, the emergence of character, and the social dynamics of praise, blame, honor, shame, and reputation. In that sense, moral psychology existed before psychology became a distinct academic discipline.

This older intellectual world also set the stage for a durable tension that still shapes the field: is morality rooted primarily in reason, or in affective and social responsiveness? Is moral judgment a matter of deducing principles, or of feeling approval and disapproval under conditions of shared human life? Is conscience a rational faculty, an internalized social spectator, a cultivated sensitivity, or a conflict among motives? Moral psychology’s history can be read, in part, as the repeated reformulation of those questions.

Early moral philosophy was also deeply concerned with formation. It asked not only what is right, but what kind of person can recognize and do the right. That concern links ancient virtue ethics, early modern moral sense theory, religious moral instruction, and later developmental psychology. The modern field’s language has changed, but its deep questions remain continuous with older traditions: how are moral agents formed, how do they fail, and how can they become more responsive to the good of others?

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Moral Sense Theory and the Sentimentalist Turn

One major origin point for modern moral psychology is British moral sense theory. Thinkers such as Shaftesbury and Francis Hutcheson argued that human beings possess a moral sense: a faculty, disposition, or affective capacity by which virtue and vice are perceived with something like immediate evaluative awareness. This did not mean morality was irrational in the dismissive sense. It meant that moral life was not reducible to cold calculation, command obedience, or self-interest. Human beings were understood as creatures capable of finding benevolence admirable and cruelty repellent through a form of affectively charged discernment.

This was a decisive shift. Instead of treating morality as mere conformity to external rule, moral sense theorists made inner responsiveness central. They asked what kind of beings human beings must be for morality to grip them at all. Why is cruelty not merely inefficient but repellent? Why is generosity not merely useful but admirable? Why do human beings respond to character, motive, and benevolence with approval? These questions anticipated much of modern moral psychology: the study of salience, intuitive judgment, moral emotion, prosocial motivation, and the felt quality of approval and condemnation.

Moral sense theory also challenged narrow egoism. If human beings are capable of approving benevolence even when it does not directly serve their interest, then morality cannot be explained only by self-preservation or strategic exchange. This does not mean moral sense theorists solved all problems of moral motivation, cultural variation, or moral disagreement. But they gave the field one of its central intuitions: moral life depends on forms of perception and feeling that make others matter to us.

At the same time, moral sense theory created problems that later moral psychology inherited. If moral approval is grounded in a moral sense, how does that sense develop? Is it universal or culturally shaped? Can it be corrupted? How does it relate to reason? What explains disagreement? What distinguishes reliable moral perception from prejudice, disgust, sentimentality, or social conformity? These questions remain alive today in research on intuition, emotion, moral perception, and cross-cultural moral judgment.

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Hume, Smith, and the Psychology of Sympathy

David Hume gave one of the classic sentimentalist formulations of moral life. In Hume’s moral philosophy, moral distinctions are not derived from reason alone, and sympathy plays a central role in human sociality and moral approval. Hume’s broader project aimed to bring something like an experimental method to the study of human nature, making him a foundational figure for later attempts to naturalize moral inquiry without eliminating normativity.

Hume’s importance for moral psychology lies partly in his refusal to separate moral evaluation from human affect. Reason can discover relations, consequences, and factual structure, but moral approval and disapproval depend on sentiment. This claim remains controversial, but it anticipated modern debates about whether moral judgment is driven primarily by affective intuition, reflective reasoning, or their interaction. Hume’s work also foregrounded habit, social experience, and the ways human beings extend concern through sympathy, imagination, and shared life.

Adam Smith developed a related but distinct framework in The Theory of Moral Sentiments. Smith’s account of sympathy, the impartial spectator, and mutual moral appraisal helped create a richer model of moral selfhood than a simple emotion-versus-reason contrast suggests. In Smith, moral life is social, reflective, and relational. People judge themselves partly by imaginatively taking up the perspective of others; conscience is shaped through interaction, spectatorship, self-scrutiny, and the desire to be worthy of approval rather than merely approved.

Smith is especially important for contemporary moral psychology because his account links moral judgment to social observation and self-regulation. Human beings learn to see themselves as objects of moral evaluation. They internalize imagined spectators. They regulate conduct in light of how others might judge them and how an impartial perspective might evaluate their actions. This anticipates modern research on moral identity, shame, guilt, reputation, self-conscious emotion, perspective-taking, and the social formation of conscience.

The sentimentalist legacy remains powerful because it correctly identified something enduring: morality is not only about what is concluded, but about what is felt, registered, admired, recoiled from, internalized, and socially reflected back to the self. Modern work on moral emotion, intuitive judgment, empathy, social evaluation, and moral identity often returns—sometimes implicitly—to problems first sharpened by Hume and Smith.

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Reason, Duty, and the Rationalist Countercurrent

Sentimentalism never had the field to itself. Enlightenment moral thought also included powerful rationalist and duty-centered traditions, most notably associated with Immanuel Kant. Even where contemporary moral psychology does not adopt Kantian ethics, the rationalist countercurrent mattered historically because it kept alive the idea that morality involves principle, universality, obligation, dignity, and reflective self-legislation rather than mere sentiment, preference, or social approval.

Rationalist traditions helped define moral agency as more than affective response. A person may feel sympathy selectively, approve what their group approves, or recoil from what their culture treats as impure. Reason-centered accounts insisted that moral judgment must be capable of critique. It must ask whether a maxim can be universalized, whether persons are being treated as ends rather than merely means, whether duty can stand against inclination, and whether moral law can bind even when feeling is absent or social approval is corrupt.

This rationalist countercurrent remains alive in contemporary research. Developmental stage theories, dual-process accounts, work on moral reasoning, research on reflective correction, and studies of principled judgment all inherit some version of the dispute. When contemporary researchers ask whether reasoning merely rationalizes intuition or can genuinely revise moral judgment, they are reworking an older conflict between affective and rational sources of moral evaluation.

The rationalist tradition also remains important because moral psychology must account for critique of social norms. If morality were only sentiment or inherited approval, then unjust social orders could be difficult to criticize from within moral psychology itself. Rationalist and duty-centered traditions preserve the idea that existing norms can be judged by standards that exceed local approval. This is crucial for understanding rights, civil disobedience, institutional critique, and moral courage under unjust conditions.

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Nineteenth-Century Shifts: Evolution, Character, and Society

In the nineteenth century, reflection on morality increasingly intersected with evolutionary thought, social theory, and new forms of social science. Questions about altruism, cooperation, sympathy, discipline, inheritance, social order, punishment, and group life became more historically and biologically framed. The moral person was no longer understood only through introspective philosophy or theological instruction, but also through broader accounts of adaptation, social formation, education, class, civilization, and collective life.

This shift did not create modern moral psychology immediately, but it prepared the ground for a more developmental, comparative, and sociological field. If moral capacities emerge through biological inheritance, social learning, institutional formation, and historical change, then moral psychology cannot focus only on adult reasoning. It must examine childhood, education, habit, socialization, cooperation, punishment, group norms, and the conditions under which moral sentiments are cultivated or suppressed.

The nineteenth century also preserved and transformed older languages of virtue, conscience, and character. Moral agency was still often discussed through habits, self-command, discipline, vice, responsibility, and cultivation. These themes remain central today even when expressed in more empirical language: self-control, grit, moral identity, personality, character strengths, prosocial behavior, social norms, moral disengagement, and ethical leadership.

Modern moral psychology still lives in the aftermath of this pluralization. It has never been only a science of decisions. It is also a science and philosophy of selfhood, habit, cultivation, social order, and institutional life. The nineteenth-century widening of moral inquiry helped make possible later research on development, social learning, cooperation, moral personality, and the relationship between individual conduct and social structure.

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The Developmental Tradition: Piaget and Kohlberg

The twentieth century brought one of the field’s most influential transformations: the developmental tradition. Jean Piaget argued that children move from heteronomous morality, in which rules are treated as fixed and externally imposed, toward more autonomous moral understanding, in which intentions, cooperation, reciprocity, and mutual respect become more central. Lawrence Kohlberg extended this work into a stage theory of moral development, proposing increasingly complex levels of reasoning from preconventional to conventional and postconventional forms.

This tradition changed moral psychology because it made morality a developmental problem rather than merely an adult philosophical problem. Children were no longer treated as simply more or less obedient, more or less disciplined, or more or less socialized. They were studied as active interpreters of rules, punishment, intention, fairness, authority, and obligation. The question became not only “What does the child do?” but “How does the child understand the moral structure of the situation?”

Kohlberg’s influence was immense because he reframed moral psychology around development, justification, and the structure of moral reasoning. He asked not simply whether someone judged an act right or wrong, but what form of reasoning supported that judgment. A person who obeys because of punishment is not reasoning in the same way as a person who respects law as social order, nor in the same way as a person who evaluates law against broader principles of justice or human dignity.

The developmental tradition elevated moral cognition and encouraged decades of research in education, developmental psychology, moral philosophy, and civic formation. It also gave moral psychology a powerful moral ideal: development beyond obedience toward reciprocity, justice, rights, and principled critique. That ideal remains important because it prevents moral development from being reduced to conformity.

Yet the developmental tradition also narrowed the field in ways that later scholars would challenge. By focusing heavily on justice reasoning, explicit verbal justification, and stage-like structure, it risked treating moral life as primarily a matter of articulated principle. Later critics argued that this overlooked emotion, care, context, gender, social identity, cultural difference, power, moral perception, and the gap between judgment and conduct.

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Gilligan, Care, and Critiques of Justice-Only Models

Carol Gilligan’s In a Different Voice became a major turning point by arguing that dominant stage models, especially Kohlberg’s, underrecognized relational and care-based moral orientations. Gilligan’s intervention did not merely add women’s experience to an established framework; it challenged the idea that mature moral thought should be defined primarily through abstract justice reasoning detached from relationships, dependency, vulnerability, and responsibility.

Whether or not one accepts all of Gilligan’s claims, her historical importance is undeniable. She widened the field’s moral vocabulary and helped re-legitimize dependency, care, relational obligation, and contextual moral responsiveness as central topics rather than secondary complications. This mattered for feminist ethics, developmental psychology, education, moral philosophy, and later work on care, empathy, and relational moral life.

The care critique forced moral psychology to ask whether its measures of maturity were themselves morally and culturally loaded. If a theory treats abstract impartiality as the highest form of moral thought, does it undervalue responsiveness to particular persons? If a theory treats dependency as a complication, does it obscure the fact that human life is interdependent from birth to death? If a theory treats relationships as obstacles to justice, does it miss the moral work of care, repair, responsibility, and accompaniment?

Gilligan’s critique also anticipated broader concerns about voice, power, and whose moral experience becomes normative. The question was not only whether women reason differently. The deeper question was whether dominant frameworks had mistaken a partial image of moral maturity for a universal one. That question remains crucial for work on race, class, disability, religion, culture, colonial history, and marginalized communities whose moral experience may not fit liberal individualist or justice-only frameworks.

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Plural Developmental Models and Social Domain Theory

As dissatisfaction with one-track stage models grew, later researchers developed more plural accounts of moral development. Social domain theory, associated with Elliot Turiel and subsequent developmental research, distinguished moral judgments from social conventions, personal choices, and prudential concerns. Children do not simply absorb undifferentiated norms. They learn to differentiate harm, fairness, welfare, authority, convention, personal autonomy, and safety.

This development mattered historically because it weakened the idea that moral development is best captured by a single staircase of increasingly abstract justice reasoning. It shifted the field toward a more differentiated map of domains, contexts, and types of social understanding. A rule about hitting is not the same kind of rule as a rule about classroom seating, clothing, manners, dietary practice, or personal preference. Children can often grasp that some rules concern harm and fairness while others depend more on authority, custom, coordination, or personal choice.

Social domain theory also helped explain why moral conflict is often a conflict over classification. One person treats an issue as moral harm; another treats it as convention; another treats it as personal liberty; another treats it as prudential safety; another treats it as religious duty. Disagreement may therefore arise before people reach substantive moral reasoning because they disagree about what kind of norm is at stake.

The plural developmental turn also brought moral psychology closer to lived moral complexity. Real moral situations often involve mixed domains: school dress codes, religious accommodations, public health rules, gender norms, family obligations, workplace conduct, speech norms, disability access, and institutional discipline. These are not easily classified as purely moral, conventional, personal, or prudential. A more mature moral psychology must study how people negotiate such overlap.

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Social Learning, Self-Regulation, and Moral Disengagement

Another major twentieth-century line emerged through social learning and social-cognitive approaches. Albert Bandura, among others, emphasized that moral conduct is not explained only by reasoning competence. People regulate themselves through internal standards, anticipated self-sanctions, socialized norms, and self-evaluative processes. But they can also selectively disengage those sanctions through justification, euphemism, displacement of responsibility, diffusion of responsibility, minimization of harm, attribution of blame, and dehumanization.

This line of work was historically decisive because it shifted attention from “How do people reason about the good?” to “How do otherwise ordinary people come to do harm while preserving a workable self-image?” The field began to study not only virtue and judgment, but mechanisms of moral evasion, rationalization, ethical collapse, and self-exoneration. This remains one of the most important moves in modern moral psychology because it connects moral cognition to real wrongdoing.

Moral disengagement also linked moral psychology to institutions and systems. Harm is easier when responsibility is diffused, language is sanitized, victims are dehumanized, consequences are hidden, and authority structures normalize compliance. A person may not experience themselves as cruel if they see themselves as merely following orders, optimizing a metric, enforcing a policy, obeying procedure, defending the group, or serving a higher cause. Moral psychology therefore had to explain not only judgment, but the social technologies by which judgment is neutralized.

This tradition remains especially relevant for organizational ethics, political violence, workplace misconduct, institutional neglect, platform harms, bureaucratic distancing, and public justification of cruelty. It reveals that moral failure often requires cognition, not the absence of cognition. People explain, justify, reframe, minimize, compare, delegate, and rationalize. Moral psychology must therefore study how people preserve moral identity while participating in harm.

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The Intuitionist and Dual-Process Turn

By the late twentieth and early twenty-first centuries, moral psychology underwent another major reorientation. Jonathan Haidt’s social intuitionist model argued that moral judgment is often produced by quick intuitions, with conscious reasoning frequently serving a post hoc justificatory function. This thesis challenged rationalist and developmental assumptions that explicit reasoning is usually the main engine of moral evaluation.

The intuitionist turn mattered because it made moral psychology more realistic about the speed, affective force, and social embeddedness of everyday judgment. People often feel that something is wrong before they can explain why. They may search for reasons after a judgment has already formed. They may become morally certain even when their justifications shift under pressure. Moral reasoning, in this view, often functions less like a judge discovering truth and more like an advocate defending an intuitive conclusion.

At the same time, Joshua Greene and others advanced dual-process frameworks in which different kinds of moral judgment reflect different interacting processes, often described in terms of emotional and more controlled cognitive responses, especially in sacrificial dilemmas. While later refinements have complicated the simple fast-versus-slow caricature, this work helped establish cognitive neuroscience and experimental dilemma research as major parts of modern moral psychology.

The intuitionist and dual-process turns did not eliminate earlier traditions. Instead, they reorganized them. Hume and Smith became newly relevant because moral sentiment and social evaluation returned to the center. Kohlberg became a point of contrast because explicit reasoning looked less causally primary. Rationalist traditions remained important because reflection could still revise judgment, discipline intuition, and evaluate principle. The field moved toward an interactional model: intuition, emotion, reasoning, social persuasion, and cultural framing all matter, but their causal order varies by context.

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Experimental Moral Psychology and the Contemporary Lab Era

Experimental moral psychology emerged as a visible interdisciplinary space linking philosophers and psychologists through studies of judgment, blame, intentionality, disgust, cooperation, punishment, trolley dilemmas, moral luck, side-effect effects, sacred values, moral disagreement, and responsibility attribution. This period brought clear gains: tighter operationalization, more precise experimental control, stronger links between philosophical problems and empirical findings, and a shared research space in which philosophers and psychologists could test intuitions rather than merely exchange them.

The experimental era also changed what counted as evidence. Instead of relying primarily on philosophical reflection, developmental interviews, or broad social theory, researchers could manipulate variables and observe effects on judgment. Does intention matter? Does disgust influence moral evaluation? Do people judge side effects differently depending on moral valence? How do people assign blame under uncertainty? What happens when harm is personal, impersonal, intentional, accidental, or foreseen? These questions became experimentally tractable.

But the experimental era also brought criticism. Some scholars argued that stylized dilemmas are too narrow, too artificial, too culturally specific, or too detached from lived moral life. Others worried that lab-based judgments could be mistaken for morality itself, sidelining development, institutions, history, relationships, power, and action. A person’s response to a hypothetical scenario is not the whole of moral agency. Moral life also includes habits, courage, fear, institutional constraint, social risk, repair, and real consequences.

Those critiques were productive. They helped push the field beyond narrow dilemma studies and toward broader research on moral conviction, prosocial conduct, moral identity, polarization, dehumanization, cross-cultural variation, institutional ethics, and moral behavior in social context. The lesson of the experimental era is therefore not that laboratory work is insufficient, but that it must be situated inside a larger moral-psychological ecology.

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Morality Across Cultures, Groups, and Politics

Contemporary moral psychology has increasingly recognized that morality is not exhausted by isolated individuals making judgments in abstract scenarios. Moral cognition is shaped across cultures, political identities, social worlds, religious traditions, class locations, racial histories, institutional contexts, and media systems. Research in this area asks which elements of morality are widespread and which are historically or culturally variable; how moral concerns become aligned with partisan identity; and why moral disagreement becomes so intense when values are linked to group membership and sacred commitments.

This marks a major historical widening of the field. Earlier stages of moral psychology often looked for universal structures of judgment. Contemporary work still investigates possible universals, but it does so with greater attention to pluralism, contestation, and the possibility that morality is inseparable from identity, coalition, narrative, and social meaning. The same event may be judged through harm, fairness, loyalty, purity, liberty, authority, care, oppression, sacrilege, dignity, or betrayal depending on the moral world from which it is interpreted.

Culture does not merely supply content to a universal moral machine. It trains attention. It teaches which harms are visible, which authorities are trusted, which duties are sacred, which emotions are appropriate, which groups are protected, which practices are normal, and which forms of suffering are minimized. Political identity can then intensify this process by linking moral judgment to belonging. People may judge the same conduct differently depending on whether it is associated with an ally, opponent, in-group, out-group, victim, authority, or symbolic threat.

Pluralism creates both moral possibility and moral danger. It makes the field more honest by preventing one cultural model from standing in for all moral life. It also makes moral disagreement harder because people may not only disagree about answers; they may disagree about what counts as harm, which norms matter, whose testimony is credible, and what kind of moral language is legitimate. Contemporary moral psychology must therefore study disagreement as a psychological, cultural, political, and institutional phenomenon.

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From Persons to Institutions

One of the strongest recent developments is the movement from a purely person-centered model toward the study of institutions and moral environments. This does not mean abandoning individual agency. It means recognizing that moral life is shaped by organizations, professions, accountability systems, bureaucratic distance, legal categories, media platforms, political structures, religious institutions, schools, workplaces, and technological systems.

A growing body of work treats morality as something enacted within systems that can either cultivate conscience and repair or normalize disengagement and cruelty. Institutions can train moral attention, protect truth-telling, create repair pathways, preserve dignity, and distribute accountability. They can also suppress testimony, diffuse responsibility, reward silence, sanitize harm, protect powerful actors, and make wrongdoing appear normal or unavoidable.

Historically, this brings moral psychology back toward some of its deepest roots. Smith, Hume, and later social theorists all understood that moral life is relational and socially formed. What is new is the empirical sophistication with which contemporary research can examine those environments. The field is becoming less narrowly a psychology of isolated judgments and more a psychology of moral agency in structured worlds.

This institutional turn is crucial because many modern harms are not produced by a single malicious actor. They arise through incentives, routines, categories, metrics, omissions, distance, outsourcing, automation, bureaucracy, and responsibility gaps. Moral psychology must therefore study how people judge and act when harm is distributed, when agency is collective, when responsibility is blurred, and when institutions shape what can be seen, said, reported, or repaired.

That broader trajectory links this knowledge series to adjacent work in Social Psychology, Organizational Psychology, Personality Psychology, Political Psychology, and Ethics and Moral Philosophy.

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The Contemporary Synthesis: Moral Agency as a Multi-Level System

The contemporary field is increasingly moving toward a multi-level account of moral agency. In this view, morality cannot be explained by sentiment, reason, development, intuition, culture, neuroscience, or institutions alone. It must be studied as an interaction among levels: embodied affect, cognitive appraisal, moral perception, developmental history, social identity, group norms, institutional design, cultural narrative, political conflict, and practical action.

This synthesis does not flatten differences among theories. It preserves the distinctive contributions of each tradition while refusing to let any one of them dominate the entire field. Sentimentalism explains why moral life has affective force. Rationalism explains why principle and critique matter. Developmental psychology explains how moral understanding changes over time. Social learning explains how conduct is shaped by modeling, reward, self-regulation, and disengagement. Intuitionist and dual-process work explains the speed and complexity of judgment. Cross-cultural research explains variation and pluralism. Institutional analysis explains how systems shape moral perception and responsibility.

The contemporary synthesis also makes moral psychology more useful for public life. It can explain why people judge quickly, why they rationalize, why they disagree, why institutions deny harm, why public condemnation can both expose and distort, why marginalized voices are often discounted, why moral education must include care and justice, and why moral action depends on more than correct judgment.

A mature moral psychology therefore asks layered questions. What became morally visible? Which emotion organized the response? What norm was invoked? What form of reasoning justified the judgment? What identity or group narrative shaped interpretation? What institutional context made harm possible or invisible? What repair pathway exists? What action follows? The field’s history has moved toward this complexity because moral life itself requires it.

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Mathematical Lens: Historical Shifts in Moral Psychology

A useful way to formalize the history of moral psychology is to treat the field as a changing distribution of explanatory emphasis across time. Let the dominant explanatory profile of a period \(t\) be represented by a vector:

where \(S_t\) represents sentiment-based explanation, \(R_t\) rationalist or principle-centered explanation, \(D_t\) developmental explanation, \(I_t\) intuitionist explanation, \(C_t\) cultural and political explanation, \(N_t\) neuroscientific or experimental explanation, and \(X_t\) institutional or structural explanation.

We can define the historical center of the field at time \(t\) as a weighted combination:

We can also model historical diversification as:

where \(p_{k,t}\) is the proportion of explanatory attention allocated to each dimension at time \(t\). This measure captures a basic historical intuition: moral psychology has become more methodologically and conceptually plural over time. Early periods often concentrated explanatory authority in one dominant faculty such as sentiment or reason, whereas contemporary research distributes explanation across multiple interacting processes and levels of analysis.

That formalization clarifies one of the field’s deepest historical lessons: moral agency is too complex to be explained by a single variable. The history of moral psychology is, in part, the history of learning that point.

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R Workflow: Modeling Historical Shifts in Moral Psychology

The following R workflow creates a synthetic historical dataset for major phases in moral psychology, assigns explanatory weights, computes a diversification measure, and visualizes how the field shifted from sentiment and reason toward development, intuition, culture, experimental method, and institutions. The code is intended for reproducible article support and conceptual modeling, not as a quantitative history of publication counts.

# The History of Moral Psychology: From Moral Sense Theory to Contemporary Research
# Synthetic R workflow for modeling historical shifts in explanatory emphasis.
# Educational and reproducible research scaffold only.

suppressPackageStartupMessages({
  library(tidyverse)
  library(scales)
})

# ------------------------------------------------------------
# 1. Set up output folders
# ------------------------------------------------------------

dir.create("outputs", showWarnings = FALSE)
dir.create("outputs/tables", recursive = TRUE, showWarnings = FALSE)
dir.create("outputs/figures", recursive = TRUE, showWarnings = FALSE)

# ------------------------------------------------------------
# 2. Build a synthetic historical dataset for major periods
# ------------------------------------------------------------

history_df <- tibble(
  period = c(
    "Moral Sense Theory",
    "Hume and Smith",
    "Rationalist Countercurrent",
    "Nineteenth-Century Social and Evolutionary Shifts",
    "Developmental Tradition",
    "Care and Domain Critiques",
    "Social Learning and Moral Disengagement",
    "Intuitionist / Dual-Process Era",
    "Experimental Moral Psychology Era",
    "Contemporary Pluralist and Institutional Era"
  ),
  year_mid = c(1735, 1765, 1785, 1880, 1965, 1985, 1995, 2005, 2015, 2025),
  sentiment = c(0.80, 0.85, 0.20, 0.35, 0.20, 0.35, 0.35, 0.55, 0.50, 0.45),
  reason = c(0.30, 0.35, 0.90, 0.45, 0.75, 0.45, 0.45, 0.35, 0.40, 0.40),
  development = c(0.10, 0.10, 0.10, 0.25, 0.95, 0.70, 0.55, 0.30, 0.35, 0.45),
  intuition = c(0.35, 0.40, 0.10, 0.30, 0.20, 0.30, 0.35, 0.90, 0.80, 0.75),
  culture_politics = c(0.10, 0.15, 0.10, 0.35, 0.15, 0.35, 0.40, 0.35, 0.60, 0.85),
  neuroscience_experiment = c(0.00, 0.00, 0.00, 0.05, 0.20, 0.25, 0.35, 0.85, 0.95, 0.80),
  institutions = c(0.15, 0.25, 0.20, 0.40, 0.20, 0.30, 0.55, 0.35, 0.50, 0.90)
)

# ------------------------------------------------------------
# 3. Compute normalized entropy as a diversification index
# ------------------------------------------------------------

entropy_norm <- function(x) {
  p <- x / sum(x)
  raw_entropy <- -sum(p * log(p))
  max_entropy <- log(length(x))
  raw_entropy / max_entropy
}

history_df <- history_df |>
  rowwise() |>
  mutate(
    diversification = entropy_norm(c_across(
      sentiment:institutions
    )),
    dominant_mode = names(which.max(c_across(sentiment:institutions)))
  ) |>
  ungroup()

print(history_df)

# ------------------------------------------------------------
# 4. Reshape for plotting explanatory shifts over time
# ------------------------------------------------------------

history_long <- history_df |>
  pivot_longer(
    cols = sentiment:institutions,
    names_to = "dimension",
    values_to = "weight"
  ) |>
  mutate(
    dimension_label = recode(
      dimension,
      sentiment = "Sentiment and sympathy",
      reason = "Reason and principle",
      development = "Development",
      intuition = "Intuition",
      culture_politics = "Culture and politics",
      neuroscience_experiment = "Neuroscience and experiment",
      institutions = "Institutions and structures"
    )
  )

# ------------------------------------------------------------
# 5. Plot the changing emphasis in moral psychology
# ------------------------------------------------------------

plot_shifts <- ggplot(
  history_long,
  aes(x = year_mid, y = weight, group = dimension_label)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  facet_wrap(~ dimension_label, ncol = 2) +
  scale_y_continuous(labels = label_number(accuracy = 0.1)) +
  labs(
    title = "Historical Shifts in Moral Psychology",
    subtitle = "Illustrative changes in explanatory emphasis across major phases",
    x = "Approximate midpoint year",
    y = "Relative emphasis"
  ) +
  theme_minimal(base_size = 12)

print(plot_shifts)

# ------------------------------------------------------------
# 6. Plot diversification of the field over time
# ------------------------------------------------------------

plot_diversification <- ggplot(
  history_df,
  aes(x = year_mid, y = diversification)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  scale_y_continuous(labels = percent_format(accuracy = 1)) +
  labs(
    title = "Diversification of Moral Psychology Over Time",
    subtitle = "Higher values indicate a more plural explanatory field",
    x = "Approximate midpoint year",
    y = "Normalized diversification"
  ) +
  theme_minimal(base_size = 12)

print(plot_diversification)

# ------------------------------------------------------------
# 7. Summarize dominant explanatory mode by period
# ------------------------------------------------------------

dominant_summary <- history_df |>
  select(period, year_mid, dominant_mode, diversification)

print(dominant_summary)

# ------------------------------------------------------------
# 8. Export tables and figures
# ------------------------------------------------------------

write_csv(history_df, "outputs/tables/moral_psychology_history_summary.csv")
write_csv(history_long, "outputs/tables/moral_psychology_history_long.csv")
write_csv(dominant_summary, "outputs/tables/moral_psychology_history_dominant_modes.csv")

ggsave(
  filename = "outputs/figures/moral_psychology_historical_shifts.png",
  plot = plot_shifts,
  width = 11,
  height = 8,
  dpi = 300
)

ggsave(
  filename = "outputs/figures/moral_psychology_diversification.png",
  plot = plot_diversification,
  width = 10,
  height = 6,
  dpi = 300
)

This workflow supports the article’s central claim: the history of moral psychology is not a simple replacement of one paradigm by another, but an accumulation and redistribution of explanatory attention. A field that once often polarized sentiment and reason now includes development, intuition, culture, politics, experimental method, neuroscience, and institutions.

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Python Workflow: Mapping Paradigm Change Across the Field

The Python workflow below models moral psychology as a historical sequence of paradigms and computes how explanatory weights change over time. It also produces a diversification measure that can support a larger platform-oriented history-of-ideas workflow. The dataset is synthetic and interpretive, designed to support reproducible article examples rather than to substitute for bibliometric research.

# The History of Moral Psychology: From Moral Sense Theory to Contemporary Research
# Python workflow for mapping paradigm change across the field.
# Educational and reproducible research scaffold only.

from pathlib import Path
import math
import pandas as pd

# ------------------------------------------------------------
# 1. Set up output folders
# ------------------------------------------------------------

output_tables = Path("outputs/tables")
output_tables.mkdir(parents=True, exist_ok=True)

# ------------------------------------------------------------
# 2. Build a synthetic historical dataset of major paradigms
# ------------------------------------------------------------

history = pd.DataFrame([
    {
        "period": "Moral Sense Theory",
        "year_mid": 1735,
        "sentiment": 0.80,
        "reason": 0.30,
        "development": 0.10,
        "intuition": 0.35,
        "culture_politics": 0.10,
        "neuroscience_experiment": 0.00,
        "institutions": 0.15
    },
    {
        "period": "Hume and Smith",
        "year_mid": 1765,
        "sentiment": 0.85,
        "reason": 0.35,
        "development": 0.10,
        "intuition": 0.40,
        "culture_politics": 0.15,
        "neuroscience_experiment": 0.00,
        "institutions": 0.25
    },
    {
        "period": "Rationalist Countercurrent",
        "year_mid": 1785,
        "sentiment": 0.20,
        "reason": 0.90,
        "development": 0.10,
        "intuition": 0.10,
        "culture_politics": 0.10,
        "neuroscience_experiment": 0.00,
        "institutions": 0.20
    },
    {
        "period": "Nineteenth-Century Social and Evolutionary Shifts",
        "year_mid": 1880,
        "sentiment": 0.35,
        "reason": 0.45,
        "development": 0.25,
        "intuition": 0.30,
        "culture_politics": 0.35,
        "neuroscience_experiment": 0.05,
        "institutions": 0.40
    },
    {
        "period": "Developmental Tradition",
        "year_mid": 1965,
        "sentiment": 0.20,
        "reason": 0.75,
        "development": 0.95,
        "intuition": 0.20,
        "culture_politics": 0.15,
        "neuroscience_experiment": 0.20,
        "institutions": 0.20
    },
    {
        "period": "Care and Domain Critiques",
        "year_mid": 1985,
        "sentiment": 0.35,
        "reason": 0.45,
        "development": 0.70,
        "intuition": 0.30,
        "culture_politics": 0.35,
        "neuroscience_experiment": 0.25,
        "institutions": 0.30
    },
    {
        "period": "Social Learning and Moral Disengagement",
        "year_mid": 1995,
        "sentiment": 0.35,
        "reason": 0.45,
        "development": 0.55,
        "intuition": 0.35,
        "culture_politics": 0.40,
        "neuroscience_experiment": 0.35,
        "institutions": 0.55
    },
    {
        "period": "Intuitionist / Dual-Process Era",
        "year_mid": 2005,
        "sentiment": 0.55,
        "reason": 0.35,
        "development": 0.30,
        "intuition": 0.90,
        "culture_politics": 0.35,
        "neuroscience_experiment": 0.85,
        "institutions": 0.35
    },
    {
        "period": "Experimental Moral Psychology Era",
        "year_mid": 2015,
        "sentiment": 0.50,
        "reason": 0.40,
        "development": 0.35,
        "intuition": 0.80,
        "culture_politics": 0.60,
        "neuroscience_experiment": 0.95,
        "institutions": 0.50
    },
    {
        "period": "Contemporary Pluralist and Institutional Era",
        "year_mid": 2025,
        "sentiment": 0.45,
        "reason": 0.40,
        "development": 0.45,
        "intuition": 0.75,
        "culture_politics": 0.85,
        "neuroscience_experiment": 0.80,
        "institutions": 0.90
    }
])

# ------------------------------------------------------------
# 3. Compute normalized entropy as a diversification index
# ------------------------------------------------------------

dimensions = [
    "sentiment",
    "reason",
    "development",
    "intuition",
    "culture_politics",
    "neuroscience_experiment",
    "institutions"
]

def normalized_entropy(values):
    total = sum(values)
    probs = [v / total for v in values if total > 0]
    raw = -sum(p * math.log(p) for p in probs if p > 0)
    max_entropy = math.log(len(dimensions))
    return raw / max_entropy

history["diversification"] = history[dimensions].apply(
    lambda row: normalized_entropy(row.tolist()),
    axis=1
)

# ------------------------------------------------------------
# 4. Compute a simple weighted center of the field
# ------------------------------------------------------------

weights = {
    "sentiment": 1.0,
    "reason": 1.0,
    "development": 1.0,
    "intuition": 1.0,
    "culture_politics": 1.0,
    "neuroscience_experiment": 1.0,
    "institutions": 1.0
}

history["field_center_score"] = history[dimensions].apply(
    lambda row: sum(row[d] * weights[d] for d in dimensions),
    axis=1
)

# ------------------------------------------------------------
# 5. Reshape for long-format analysis
# ------------------------------------------------------------

history_long = history.melt(
    id_vars=["period", "year_mid", "diversification", "field_center_score"],
    value_vars=dimensions,
    var_name="dimension",
    value_name="weight"
)

# ------------------------------------------------------------
# 6. Identify the dominant explanatory mode in each period
# ------------------------------------------------------------

history["dominant_mode"] = history[dimensions].idxmax(axis=1)

dominant_summary = history[
    ["period", "year_mid", "dominant_mode", "diversification", "field_center_score"]
]

print(dominant_summary)
print(history_long.head())

# ------------------------------------------------------------
# 7. Identify growth in explanatory modes across the historical sequence
# ------------------------------------------------------------

growth_rows = []

for dimension in dimensions:
    first_value = history.iloc[0][dimension]
    last_value = history.iloc[-1][dimension]
    growth_rows.append({
        "dimension": dimension,
        "first_period_value": first_value,
        "contemporary_value": last_value,
        "net_change": last_value - first_value
    })

growth_summary = pd.DataFrame(growth_rows).sort_values(
    "net_change",
    ascending=False
)

print(growth_summary)

# ------------------------------------------------------------
# 8. Export files for further modeling or dashboard use
# ------------------------------------------------------------

history.to_csv(output_tables / "moral_psychology_history_summary.csv", index=False)
history_long.to_csv(output_tables / "moral_psychology_history_long.csv", index=False)
dominant_summary.to_csv(output_tables / "moral_psychology_dominant_modes.csv", index=False)
growth_summary.to_csv(output_tables / "moral_psychology_explanatory_growth.csv", index=False)

print("Synthetic moral psychology history outputs written to:", output_tables)

This workflow is useful because it lets the history of moral psychology be treated as a structured analytical object rather than only a narrative sequence. It can be extended into bibliometric work, article-map metadata, cross-series intellectual history, visual timelines, paradigm maps, or teaching dashboards.

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GitHub Repository

The companion repository for this article provides a reproducible code scaffold for modeling historical shifts in moral psychology, including moral sense theory, sentimentalism, rationalism, developmental traditions, care ethics, social domain theory, social learning, moral disengagement, intuitionist and dual-process models, experimental moral psychology, cultural and political pluralism, and institutional approaches to moral agency.

The repository structure should support a full research workflow rather than a single script. The article folder can include language-specific examples in python, r, julia, sql, c, cpp, fortran, go, and rust, along with data, docs, notebooks, and outputs. This structure makes the article reproducible, inspectable, and extensible for readers who want to move from conceptual history to analytical demonstration.

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Conclusion

The history of moral psychology is a history of repeated efforts to identify the main engines of moral life. Early modern sentimentalists illuminated approval, sympathy, conscience, and moral feeling. Rationalist traditions insisted on principle, obligation, universality, and reflective agency. Nineteenth-century shifts connected morality to evolution, character, social formation, and institutional order. Developmental theorists clarified how moral judgment changes across childhood and adolescence. Care theorists and domain theorists challenged narrow justice-centered models. Social-cognitive approaches exposed moral disengagement and self-exoneration. Intuitionist and dual-process research shifted attention toward fast evaluation, affect, cognition, and neuroscience. Contemporary work has widened the field still further by studying morality across cultures, politics, institutions, organizations, platforms, and polarized publics.

The result is not confusion but maturity. Moral psychology is strongest when it refuses single-cause explanations. Moral life is at once emotional and reflective, developmental and situational, personal and institutional, universalizing and culturally variable. The field’s history shows why: every era identified something essential, but none exhausted the subject.

To study moral psychology historically is therefore to learn a conceptual discipline as well as a chronology. It is to see that moral agency is too dense to be captured by sentiment alone, reason alone, development alone, intuition alone, or institutions alone. It is to understand that moral judgment requires perception, that moral feeling requires interpretation, that moral reasoning requires culture, that moral identity requires social formation, that moral action requires conditions, and that moral responsibility often extends into systems.

The history of moral psychology ultimately teaches pluralism because the phenomenon itself requires it. Human beings are feeling, reasoning, developing, social, cultural, embodied, institutional, and self-interpreting creatures. Their moral lives cannot be understood by isolating one faculty from the rest. The field’s future will be strongest when it carries forward the best of its past: sentimentalist attention to sympathy, rationalist attention to obligation, developmental attention to formation, social-cognitive attention to self-regulation and disengagement, experimental attention to method, cultural attention to pluralism, and institutional attention to the structured worlds in which moral agency succeeds or fails.

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Related articles

• What Is Moral Psychology?
• Moral Judgment and the Psychology of Right and Wrong
• Moral Reasoning: Piaget, Kohlberg, and the Developmental Tradition
• Intuition, Reflection, and the Structure of Moral Evaluation
• Moral Development in Childhood and Adolescence
• Moral Disengagement and the Psychology of Ethical Failure
• Cross-Cultural Moral Psychology
• Methods in Moral Psychology: Experiment, Development, and Measurement

Further reading

• Doris, J. (2006, rev. 2022) ‘Moral Psychology: Empirical Approaches’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/moral-psych-emp/.
• Kauppinen, A. (2014) ‘Moral Sentimentalism’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/moral-sentimentalism/.
• Fleischacker, S. (2013) ‘Adam Smith’s Moral and Political Philosophy’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/smith-moral-political/.
• Cohon, R. (2004, substantive revision) ‘Hume’s Moral Philosophy’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/hume-moral/.
• Gray, K. and Pratt, S. (2025) ‘Morality in Our Mind and Across Cultures and Politics’, Annual Review of Psychology, 76, pp. 663–691. Available at: https://www.annualreviews.org/content/journals/10.1146/annurev-psych-020924-124236.
• Ellemers, N., van der Toorn, J., Paunov, Y. and van Leeuwen, T. (2019) ‘The Psychology of Morality: A Review and Analysis of Empirical Studies Published From 1940 Through 2017’, Personality and Social Psychology Review, 23(4), pp. 332–366. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6791030/.
• Haidt, J. (2001) ‘The Emotional Dog and Its Rational Tail: A Social Intuitionist Approach to Moral Judgment’, Psychological Review, 108(4), pp. 814–834. Available at: https://www.its.caltech.edu/~squartz/haidt.pdf.
• Greene, J.D. (2023) ‘Dual-process moral judgment beyond fast and slow’, Behavioral and Brain Sciences, 46. Available at: https://www.cambridge.org/core/journals/behavioral-and-brain-sciences/article/dualprocess-moral-judgment-beyond-fast-and-slow/7A54DE39FA5305140632DB9CCEF12BDA.

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References

• Bandura, A. (2022) Manual for Constructing Moral Disengagement Scales. Available at: https://albertbandura.com/pdfs/MANUAL%20FOR%20CONSTRUCTING%20MORAL%20DISENGAGEMENT%20SCALES.pdf.
• Cohon, R. (2004) ‘Hume’s Moral Philosophy’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/hume-moral/.
• Doris, J. (2006, rev. 2022) ‘Moral Psychology: Empirical Approaches’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/moral-psych-emp/.
• Ellemers, N., van der Toorn, J., Paunov, Y. and van Leeuwen, T. (2019) ‘The Psychology of Morality: A Review and Analysis of Empirical Studies Published From 1940 Through 2017’, Personality and Social Psychology Review, 23(4), pp. 332–366. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6791030/.
• Fleischacker, S. (2013) ‘Adam Smith’s Moral and Political Philosophy’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/smith-moral-political/.
• Gilligan, C. (1982) In a Different Voice: Psychological Theory and Women’s Development. Cambridge, MA: Harvard University Press.
• Gray, K. and Pratt, S. (2025) ‘Morality in Our Mind and Across Cultures and Politics’, Annual Review of Psychology, 76, pp. 663–691. Available at: https://www.annualreviews.org/content/journals/10.1146/annurev-psych-020924-124236.
• Greene, J.D. (2023) ‘Dual-process moral judgment beyond fast and slow’, Behavioral and Brain Sciences, 46. Available at: https://www.cambridge.org/core/journals/behavioral-and-brain-sciences/article/dualprocess-moral-judgment-beyond-fast-and-slow/7A54DE39FA5305140632DB9CCEF12BDA.
• Haidt, J. (2001) ‘The Emotional Dog and Its Rational Tail: A Social Intuitionist Approach to Moral Judgment’, Psychological Review, 108(4), pp. 814–834. Available at: https://www.its.caltech.edu/~squartz/haidt.pdf.
• Kauppinen, A. (2014) ‘Moral Sentimentalism’, in Zalta, E.N. and Nodelman, U. (eds.) The Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/moral-sentimentalism/.
• Kohlberg, L. (1981) Essays on Moral Development, Volume I: The Philosophy of Moral Development. San Francisco: Harper & Row.
• Kohlberg, L. (1984) Essays on Moral Development, Volume II: The Psychology of Moral Development. San Francisco: Harper & Row.
• Piaget, J. (1932) The Moral Judgment of the Child. London: Routledge & Kegan Paul.
• Smith, A. (1759) The Theory of Moral Sentiments. London: A. Millar.
• Turiel, E. (1983) The Development of Social Knowledge: Morality and Convention. Cambridge: Cambridge University Press.
• Yoo, H.N. and Smetana, J.G. (2022) ‘A meta-analysis of social domain theory research’, Child Development. Available at: https://pubmed.ncbi.nlm.nih.gov/35311313/.

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