Contribution
- A proposal that moral intuitions, not moral reasoning, are where evolved psychology meets culture: “the golden spike” between the two (p. 57).
- A list of four candidate moral modules, each with an adaptive challenge, a proper domain, an actual domain, characteristic emotions and the virtues built on it (Table 1, p. 59).
- A link from those modules to virtue theory: virtues are culturally constructed, but built on and constrained by the prepared intuitions (pp. 61–63).
- An account of four ways cultures vary on a shared base (pp. 63–64), and advice for moral education and for political disagreement (pp. 65–66).
Key insight
Morality is innate as a small set of prepared intuitions, and socially constructed as sets of interlocking virtues. Evolution supplies a few “social receptors”, like the tongue’s five taste receptors, that make some patterns easy to moralize. Culture decides what else triggers them, which ones it builds on, and what virtues it assembles from them.
Assumptions
- Two systems. Most moral judgment is intuitive and fast; reasoning is slow and mostly comes after (p. 57, citing Haidt 2001, LIT-511).
- Preparedness, not hard-wiring. Innate here means a readiness to learn some associations quickly, as with fear of snakes (p. 58).
- Modularity in a weak sense. A module is a fast input–output routine for a recurrent problem; the essay follows Sperber and Hirschfeld’s partial modularity (fn. 10).
- Method. “Meta-empirical”: the authors listed the social situations five works said people (or chimpanzees) evaluate, and counted how many of the five mentioned each (p. 58). Two works describe universals (Brown 1991; Fiske 1991), two cultural variation (Schwartz & Bilsky 1990; Shweder et al. 1997), and one primate precursors (de Waal 1996).
Key results
There are no empirical results. The tally and the table are the content.
- The tally (p. 58). Suffering/compassion, reciprocity/fairness and hierarchy/respect appeared in all five works.
- Purity (pp. 60–61). Added on the strength of “our research and that of others”. The module evolved against microbes and parasites; its proper domain is rotting corpses, excrement and scavengers; its emotion is disgust. Cultures elaborate it into rules on diet, hygiene and sex.
- Table 1 (p. 59).
| Suffering | Hierarchy | Reciprocity | Purity | |
|---|---|---|---|---|
| proper domain | suffering and vulnerability of one’s children | physical size and strength, domination, and protection | cheating vs. cooperation in joint ventures, food sharing | people with diseases or parasites, waste products |
| actual domain | baby seals, cartoon characters | bosses, gods | marital fidelity, broken vending machines | taboo ideas (communism, racism) |
| emotions | compassion | resentment vs. respect/awe | anger/guilt vs. gratitude | disgust |
| virtues | kindness, compassion | obedience, deference, loyalty | fairness, justice, trustworthiness | cleanliness, purity, chastity |
- Evolutionary stories (pp. 58–59). Suffering from maternal care of dependent young; hierarchy from making the most of rank in primate groups (de Waal); reciprocity from reaping the gains of cooperating with non-kin (Trivers 1971, fn. 9).
- Ingroup (fn. 15). “The best candidate for a fifth”: a module whose proper domain is the co-residing kin group, extended now to ethnic groups, teams and hobbyist gatherings.
- Cultural variation (pp. 63–64). Cultures widen actual domains (racism taught through the purity and reciprocity modules); weight the modules differently (American Muslims and conservatives value kindness, respect for authority, fairness and spiritual purity, while liberals lean on suffering and reciprocity); give a virtue different intuitive bases (loyalty in reciprocity or in hierarchy; honor as integrity, chivalry or chastity); and form unique virtue complexes (the Arab hamasa).
Claims
| id | claim | strength | support |
|---|---|---|---|
| C1 | Moral judgment is mostly intuitive, with reasoning after the fact | moderate, as background | cited to Haidt 2001 (LIT-511) and Nisbett & Wilson 1977 |
| C2 | Four intuitions (suffering, hierarchy, reciprocity, purity) are innately prepared | weak | a count over five secondary works, plus “our research” for purity; no data shown |
| C3 | Purity intuitions descend from a pathogen-avoidance module and its disgust | weak–moderate | cited to Rozin, Haidt & McCauley (fn. 11); the essay states it, it does not test it |
| C4 | Ingroup is the most likely fifth module | assertion | fn. 15 |
| C5 | Virtues are culturally constructed on the prepared intuitions and learned inductively | informal argument | virtue theory and connectionist analogies (pp. 61–62) |
| C6 | Conservatives draw on more of the modules than liberals | weak | ”in our own research we have found” (p. 64), no figures |
| C7 | Children raised with consistent moral feedback acquire virtues better than those whose parents avoid imposing morality | assertion | stated as a consequence of the theory (p. 65), untested here |
Concepts
- moral intuition — “feelings of approval or disapproval pop into awareness as we see or hear about something someone did” (p. 56).
- module — a processing system designed for problems that recurred in the ancestral environment, giving fast automatic responses to specific triggers (pp. 59–60).
- proper domain / actual domain — the stimuli a module evolved to handle, and everything that now happens to trigger it (Sperber’s terms, p. 60). Later MFT texts call them original and current triggers.
- virtue — a disciplined, socially tuned sensitivity of perception, emotion and response; “virtues are social skills” (p. 61).
- virtue complex — a culture’s characteristic cluster of virtues, not logically bound together (p. 64).
Connections
- Morality-as-cooperation. LIT-047, read in NOTE-034, argues (pp.
49–50 of that paper) that MFT omits kin altruism, reciprocal altruism,
bravery and property, and that purity has “no explicated connection to
cooperation”. Against this text:
- Kin. The suffering module’s proper domain is one’s own child, and its story is maternal care. The kin-selection grounding is there; what is missing is a separate duty-to-family module, and the actual domain is widened to any suffering.
- Reciprocity. The module is named reciprocity and grounded in Trivers. LIT-047’s footnote 1 retreats to the narrower charge that MFT conflates reciprocity with fairness, which fits this table: “fairness, justice, trustworthiness” are the reciprocity module’s virtues.
- Bravery and property. Neither is a module here. Hierarchy covers domination and deference together, where morality-as-cooperation separates hawkish from dovish displays.
- Purity. LIT-047 is right that purity is grounded here in disease avoidance, not cooperation. It is wrong that the essay calls purity odd because it is not about how we treat others: the essay calls it odd to Westerners who think morality is only about that (p. 60).
- Moral disciplining. LIT-101 (read in NOTE-132) proposes that the puritanical part of this purity module, temperance, chastity and piety, is cooperative morality fed by beliefs about self-control. It excludes the contamination part, which is exactly this essay’s proper domain.
- Relationship regulation. Rai and Fiske (LIT-507) take Fiske’s relational models, one of the five works surveyed here, and fold purity and ingroup into a single motive, Unity.
- The later theory. Graham et al. 2013 (LIT-499) restates the theory with five foundations (ingroup promoted from fn. 15, suffering renamed Care) and criteria for adding more.
Bearing on the record
- NOTE-034’s claim C7 (MAC is broader and more precise than MFT). This essay supports half of it. The derivation here is a count over five books, which is less principled than a derivation from game theory, so “more precise” fits. “Broader” does not fit as stated: the essay grounds its modules in kin care and in Trivers’ reciprocity, and it moralizes purity, which the seven cooperative domains leave out.
- No THEORY document cites it. No ML instruction; nothing here belongs in the anthology.
Note of 2026-10-16: THEORY-539 now cites LIT-502 as a source.
Limitations
- No data. The tally that selects three of the four modules counts mentions in secondary works, and the fourth is added from unreported research.
- “Module” is used loosely. The essay does not say what would show that two of its patterns are one module, or that one is two.
- The evolutionary stories are sketches. Hierarchy and reciprocity are primate-general; nothing explains why only humans moralize them through third parties, a point the essay itself raises (p. 58).
- The political claims (C6) and the parenting advice (C7) rest on no evidence given here.
Open questions
- What would decide between purity as a pathogen module (this essay), purity as a cooperative concern about self-control (LIT-101), and purity as a Unity motive in communal relationships (LIT-507)? A study that separates contamination purity from puritanical purity, with relationship context varied, would discriminate.
- Is the reciprocity module one thing or two? The MFQ-2 later split fairness into Equality and Proportionality (LIT-500), and morality-as-cooperation splits it into reciprocity and division.
Corrections
- none to a seeded skim (there was no seed)
- LIT-047’s “odd corner” reading. LIT-047 (fn. 2) says purity is called an odd corner “precisely because it is not ‘concerned with how we treat other people’”. The essay’s sentence is that purity is odd “at least for modern Westerners, who tend to think of morality as strictly concerned with how we treat other people” (p. 60). The quoted words describe Westerners’ view of morality, not purity.