Cooley and Mead are sociology's own (2.3.2, 2.3.3). But the discipline also borrowed heavily from psychology in building its account of the self — and the borrowings brought real insight along with real trouble.

This lesson takes four of them. The aim is not to teach you psychology. It is to show you what sociology used each for, and to model the operation 1.5.3 demanded: taking a neighbouring discipline seriously while noticing exactly where its claims stop being supported.

Freud: society as an internal agency

Sigmund Freud's structural model divides the mind into three:

The id — the reservoir of instinctual drives, seeking immediate gratification, present from birth. The ego — the reality-oriented part, mediating between drives and what circumstances permit. The superego — the internalised voice of parental and social prohibition: conscience, and the ideals against which one is measured.

What sociology took. The superego is the discipline's real interest, and the reason Freud appears in this course. It is a model of society installed inside the person as a functioning agency — one that punishes with guilt, that operates without any external observer, and that the person experiences as their own conscience rather than as an imposition.

Notice how well that maps onto what you already have. It is Mead's "me" (2.3.3). It is Durkheim's collective conscience experienced from inside (4.2). It is 1.1.3's internalisation and 2.1.4's internal sanctions. Four traditions, working independently, arriving at the same finding — that social control's most powerful mechanism is located within the controlled.

Freud's larger argument in Civilization and Its Discontents is also genuinely sociological: civilisation requires the renunciation of drives, that renunciation produces a permanent reservoir of discontent, and social order is therefore purchased at a psychic cost. Whether or not you accept the theory of drives, the structure of the argument — order costs something, and the cost is borne internally — recurs throughout the discipline. Norbert Elias's civilising process (5.10) develops it historically; the Frankfurt School, especially Marcuse, built critical theory partly on it (5.6).

What sociology should not take.

The claims are hard to falsify. Resistance to an interpretation can be read as confirming it, which is exactly the problem 1.5.3 identified.

The universality claim failed an early test — and the test was anthropological. Bronisław Malinowski, working in the Trobriand Islands, argued that the Oedipal configuration Freud described could not be universal, because Trobriand family structure was matrilineal: the mother's brother held the authority Freud attributed to the father, and the tensions Malinowski observed followed the authority relation rather than the biological one. The debate that followed is unresolved in detail and decisive in principle: the structure of a family determines the structure of its psychic conflicts, which makes the configuration social rather than natural. That is one of the earliest and clearest demonstrations of what comparative evidence does to a universal claim.

And the account of women is indefensible by any current standard, and was contested at the time.

Piaget: development has stages

Jean Piaget studied how children's thinking changes, and proposed a sequence: sensorimotor (roughly to two), preoperational (two to seven), concrete operational (seven to eleven), formal operational (eleven and up).

What sociology took, and it is more than most textbooks credit.

The capacity for perspective-taking develops. Mead's play and game stages (2.3.3) assume a child who becomes able to hold others' viewpoints. Piaget provided evidence that this capacity is not present from the start and emerges in a rough sequence. The two accounts fit remarkably well.

And — the genuinely sociological finding — peer relations matter more than adult authority for moral development. In The Moral Judgment of the Child, Piaget observed children playing marbles and found two moral orientations. Younger children treated the rules as fixed, external and sacred (moral realism, or heteronomous morality) — because rules came from adults, who are large and cannot be argued with. Older children, negotiating rules among equals, came to see them as agreements that could be changed by consent (autonomous morality).

His conclusion is one that belongs in this course: a morality of mutual respect develops in relations between equals, not in relations of authority. Which is a claim about social structure producing moral capacity — and it explains why the peer group (2.2.5) is a distinctive socialising environment rather than merely another influence.

What to be careful about. Later research found Piaget underestimated young children's abilities (tasks designed differently reveal competences his methods missed); stages are less discrete and less universal than proposed; and formal operational reasoning is far from universal in adults, being closely tied to schooling — which is itself a sociological finding.

Kohlberg: moral reasoning in stages

Lawrence Kohlberg extended Piaget to moral reasoning, using dilemmas — most famously Heinz, whose wife will die without a drug he cannot afford and which the chemist refuses to sell cheaply. Should he steal it?

Kohlberg was interested not in the answer but in the reasoning, and proposed three levels:

Pre-conventional — reasoning by consequences to oneself: punishment, reward, exchange. Conventional — reasoning by conformity to social expectations: being a good person, maintaining the social order and the law. Post-conventional — reasoning by principles held to be more fundamental than particular laws: rights, justice, universal ethical principles.

What sociology took. The observation that moral reasoning has structure and that it changes with social participation — and the useful finding that most adults reason conventionally most of the time, which is 2.1.3 and 2.3.3 from another angle: people follow rules because they are the rules.

The criticisms are serious and you should know them.

It measures reasoning, not conduct. The gap between what people say about a dilemma and what they do in one is large and well documented.

The sample. The original longitudinal study followed boys only, and the scheme was built from their responses before being applied to everyone.

And the cultural charge, which is the important one. The "highest" stage is an individualistic, principle-based, abstract-rights morality that closely resembles the moral outlook of educated Western liberals — with the consequence that people reasoning from community obligation, family duty or religious authority score lower on a developmental scale. That is not a neutral measurement; it is a hierarchy of moralities with the researcher's own near the top. Richard Shweder's research in Odisha is the best-known corrective: he found moral reasoning organised around three distinct ethics — autonomy (harm, rights, fairness), community (duty, hierarchy, interdependence) and divinity (purity, sanctity, natural order) — with different weights in different populations, and none reducible to an immature version of another.

This is 2.1.8's problem, arriving inside a psychological instrument: a local standard presented as a universal scale.

Go deeper

What sociology's stance should be

Four rules, and they generalise to any borrowing from a neighbouring discipline.

Take the mechanism, question the universality. Freud's internal agency, Piaget's developing perspective-taking, Kohlberg's structured reasoning: all useful. Their claims to describe all humans everywhere: check against comparative evidence.

Ask who the sample was. Every one of these schemes was built from a narrow population — Viennese patients, Swiss schoolchildren, American boys — and generalised. This is 2.1.10's WEIRD problem, arriving one theory at a time.

Ask what is at the top of the ladder. Any developmental scheme that ranks people has an endpoint, and the endpoint is a value judgement wearing a lab coat. Whose morality is "post-conventional"? Whose thinking is "formal operational"? Notice, every time.

And keep explanation at the right level (1.4.1). These theories explain processes inside individuals. They cannot explain why moral standards differ between groups, why they change over decades, or why they are enforced unequally. Using them for that is psychologism.

The genuinely useful synthesis

What survives from all four, once the universality claims are set aside, is a coherent and sociologically usable picture:

Moral capacity develops and requires social interaction — it is not present at birth and does not appear without others (2.3.1).

External authority becomes internal agency — the shared finding of Freud, Mead, Durkheim and 1.1.3, arrived at four times independently.

Relations among equals produce a different morality from relations of authority — Piaget's marbles, and one of the best reasons to take the peer group seriously.

Moral reasoning is patterned rather than random, and most adults most of the time reason conventionally.

And moral frameworks are plural — autonomy, community, divinity, justice, care — with different weights in different societies and different situations, and no defensible scale on which one is simply more developed than another.

That last point is where this lesson delivers you to Part 6, and it is worth noticing that a psychology lesson has arrived at a decolonial conclusion by its own route.

Why it matters

It gives you a worked example of intellectual borrowing done properly. Take the mechanism, check the sample, locate the value judgement, keep the level straight. You will need this every time sociology touches economics, psychology, biology or neuroscience.

It supplies what Mead left out. Mead assumed a developing capacity for role-taking; Piaget showed it develops and how. Together they are a stronger account than either alone.

It shows a universal scale being dismantled by comparative evidence — Malinowski on the Oedipus complex, Shweder on the three ethics — which is precisely the operation Part 6 performs on sociology's own universal claims. That parallel is not incidental. It is the same intellectual move.

And it leaves you with a durable question. Whenever anyone presents a developmental scale — of morality, civilisation, maturity, or economic development — ask what is at the top and who put it there.