Contribution
- A model of moral judgment in which intuition is the default cause and reasoning the usual consequence (Figure 2), set against rationalist models (Kohlberg, Turiel) in which reasoning causes judgment (Figure 1).
- Four arguments against the causal primacy of moral reasoning (pp. 8–16).
- An account of where intuitions come from: partly innate, primate-derived and externalized in development; selected and tuned by culture through custom complexes and peer socialization in late childhood (pp. 17–22).
- Three proposed tests (p. 23): interfere with reasoning, vary the ecological validity of interviews, and look for consilience.
Key insight
Moral reasoning is a lawyer, not a judge. People feel that something is wrong, then search for reasons, and when the reasons are knocked down they keep the judgment (“I don’t know, I can’t explain it, I just know it’s wrong”). Reasoning matters mainly socially: it changes other people’s minds by triggering new intuitions in them.
Assumptions
- Definitions (pp. 5–7).
- Moral judgment: “evaluations (good versus bad) of the actions or character of a person that are made with respect to a set of virtues held by a culture or subculture to be obligatory”. The definition is left broad on purpose.
- Moral reasoning: “conscious mental activity that consists of transforming given information about people in order to reach a moral judgment”.
- Moral intuition: “the sudden appearance in consciousness of a moral judgment, including an affective valence (good-bad, like-dislike), without any conscious awareness of having gone through steps of search, weighing evidence, or inferring a conclusion”.
- Dual process. Intuition and reasoning are both cognition. Intuition is fast and its process inaccessible; reasoning is slow and partly conscious (Table 1).
- Scope of the claim. Descriptive only; the paper makes no claim about how judgments ought to be made (p. 3).
Key results
- The six links (pp. 7–8). 1 intuitive judgment; 2 post-hoc reasoning; 3 reasoned persuasion (one person’s reasons trigger another’s intuitions); 4 social persuasion (others’ judgments shift one’s own directly); 5 reasoned judgment (reasoning overrides intuition, rare); 6 private reflection (role-taking triggers a competing intuition). Moral judgment is said to consist “primarily of links 1 through 4”.
- Four problems for rationalism.
- Dual process (pp. 8–10): affective evaluation is fast and pervasive; impressions form from thin slices.
- Motivated reasoning (pp. 10–12): relatedness and coherence motives bias the search for evidence; people are “intuitive lawyers”.
- Post hoc (pp. 12–14): people confabulate reasons for behaviour (Nisbett & Wilson); this yields the “wag-the-dog” and “wag-the-other-dog’s-tail” illusions.
- Action (pp. 14–16): moral reasoning predicts moral behaviour weakly once IQ is partialled; psychopaths and VMPFC patients reason intact and act badly; empathy drives helping.
- Harmless wrongs (p. 5). In Haidt, Koller and Dias (1993), Americans and Brazilians condemned harmless offensive acts (eating one’s dead dog, cleaning a toilet with the flag, masturbating with a chicken carcass then eating it), and affective reactions predicted judgments better than claims of harm. Haidt and Hersh found the same for sexual morality among liberals and conservatives, with “moral dumbfounding”.
- Manipulated intuition (p. 17). Wheatley and Haidt: a hypnotically induced pang of disgust attached to a word raised both disgust and condemnation of stories containing that word.
- Origins (pp. 17–19). Primate prescriptive norms (de Waal); three of Fiske’s four relational models have primate parallels (communal sharing with kin care, authority ranking, equality matching with Trivers’ reciprocity); market pricing is uniquely human. The human novelty is third-party norm enforcement. “Once morality is located in a group’s efforts to solve cooperation and commitment problems (Darwin; Frank)”, interpersonal influence is required (pp. 18–19).
- Development (pp. 19–22). Fiske’s models externalize in sequence; cultures keep some intuitions and lose others, like phonemes; custom complexes (purity in Orissa) and peers in a sensitive period of roughly ages 9–15 (Minoura) do the tuning.
Claims
| id | claim | strength | support |
|---|---|---|---|
| C1 | Moral judgment is usually caused by intuition, not reasoning | moderate | converging non-moral evidence on automaticity; the author calls the model “a plausible alternative … not … an established fact” (pp. 2–3) |
| C2 | Moral reasoning is mostly motivated and post hoc | moderate | social-cognition literature (Kunda; Nisbett & Wilson; Lord, Ross & Lepper); little of it uses moral stimuli |
| C3 | Harmless taboo violations are condemned, and affect predicts the condemnation better than perceived harm | moderate | Haidt, Koller & Dias 1993; Haidt & Hersh; reported, not re-analysed here |
| C4 | Moral action tracks moral emotion and self-regulation more than moral reasoning | weak–moderate | Blasi’s review reinterpreted through IQ; psychopathy and VMPFC case evidence; correlational |
| C5 | Increasing a gut feeling increases moral condemnation | weak | one hypnosis study (Wheatley & Haidt), small sample of highly hypnotizable participants |
| C6 | Moral intuitions are partly innate and emerge by externalization in a fixed sequence | weak | Fiske’s developmental sequence and primate parallels; argument by analogy to phonology |
| C7 | Reasoning changes judgments chiefly by triggering intuitions in other people | weak | persuasion research; no moral test |
Concepts
- social intuitionist model (SIM) — the six-link model above.
- moral dumbfounding — stuttering, laughter and surprise at being unable to find reasons, without giving up the judgment (p. 5).
- a priori moral theories — “a pool of culturally supplied norms for evaluating and criticizing the behavior of others”, from which post-hoc reasons are drawn (p. 13).
- custom complex — a customary practice together with the beliefs, values, sanctions and motives attached to it (Whiting & Child; Shweder).
- somatic markers — Damasio’s body-state signals that tag options with feeling; the paper’s proposed mechanism for intuition (p. 16).
Connections
- Moral Foundations Theory. The founding essay, LIT-502, takes this model’s intuitionism and asks what the intuitions are about; Graham et al. 2013 (LIT-499) call the model “the prequel to MFT”.
- Damasio. The mechanism of intuition is the somatic marker hypothesis, read in the record as LIT-384. The VMPFC evidence the paper uses for “acquired sociopathy” is the same line.
- Morality-as-cooperation (LIT-047, NOTE-034). Compatible on function: this paper places morality in cooperation and commitment problems (pp. 18–19). It differs on scope: its definition of moral judgment is any evaluation against a culture’s obligatory virtues, so “eating a low fat diet” can be moral in health-conscious subcultures (p. 6). Under that definition, whether all morality is cooperative is an empirical question, and the harmless-wrong studies count against a yes.
- The harmless-wrong cases.
- Bloom’s commentary on LIT-047 uses the same kind of case (sex with a pig) against morality-as-cooperation.
- Baumard, André and Sperber’s Response (LIT-508, R4.4) answers the Haidt, Koller and Dias chicken case with a fairness account of sexual restraint.
- Rai and Fiske (LIT-507) say incest is wrong because it violates a configuration of kin relationships, so it is not context-free.
- Schein and Gray (LIT-494), by their abstract, argue “against intuitive harmless wrongs”.
- Disgust. NOTE-132 (Fitouchi et al., LIT-101) reports a meta-analysis (Landy & Goodwin 2015) finding that incidental disgust does not reliably amplify condemnation. That bears on C5.
Bearing on the record
- NOTE-034, Bloom’s objection. Bloom says morality-as-cooperation says nothing about proximate mechanisms. This paper is one candidate mechanism, and nothing in it contradicts a cooperative ultimate function.
- NOTE-034, C3 and the open question. NOTE-034 asks how often non-cooperative domains (purity, sex, harm) are moralized. This paper’s reported studies say harmless sexual and purity violations are condemned in the United States and Brazil. That is evidence those domains are moralized, not evidence about why.
- No THEORY document cites it. No ML instruction.
Note of 2026-10-16: THEORY-558 and THEORY-632 now cite LIT-511 as a source.
Limitations
- The evidence is mostly about judgment in general, carried over to moral judgment by argument. The paper says so.
- The core studies are the author’s own, reported briefly. Two were unpublished or in press at the time (Haidt, Bjorklund & Murphy 2000; Haidt & Hersh).
- Links 5 and 6 make the model hard to falsify: any case of reasoning changing a judgment can be assigned to them, and the model only says they are “rare”.
- The “action problem” argues from correlations and clinical cases, not experiments.
Open questions
- How often do links 5 and 6 occur outside interviews? The paper’s own proposed test is ecological: real stories, known people, others present.
- Does the harmless-wrong effect survive when perceived harm is measured rather than stipulated? Dyadic morality (LIT-494) says it does not.
Corrections
- none to a seeded skim (there was no seed)
- The manuscript cites Wheatley & Haidt (2000) as a manuscript in preparation. It appeared in Psychological Science in 2005, as Graham et al. 2013 (LIT-499) cite it, so C5 rests on a study that was not yet published when the model was stated.