Nature vs Nurture - Feral and Isolated Children

Everything in Topics 2.1 and 2.2 assumed something enormous and unexplained: that people arrive already fitted to their society. That they know how to be a patient, a student, a daughter. That they want roughly what their position expects them to want (1.1.3).

Nobody is born like that. Topic 2.3 asks how it happens.

And the first question is the oldest one about human beings — how much of what you are was already in you, and how much was put there?

In November 1970, a social worker in Los Angeles met a thirteen-year-old girl who could not walk properly, was not toilet trained, weighed twenty-seven kilograms, and could say almost nothing.

She has been called Genie in the literature, a pseudonym. From about twenty months of age she had been confined by her father to a small room, strapped to a chair for most of her waking hours, and beaten if she made noise. There was almost no speech in the house directed at her. This continued for over eleven years.

When she was found she had a vocabulary of a handful of words. Over the following years, working with linguists and psychologists, she acquired a substantial vocabulary — she learned words steadily and used them meaningfully. What she never acquired was grammar: she did not reliably produce the structures that a typical four-year-old produces without instruction.

The research that followed became, itself, an ethical scandal — a dispute over funding, custody, publication and who was responsible for her, in which a severely damaged young woman was moved between homes and eventually into institutional care, where she remains, in her sixties, out of public view.

Two things must be said before this case is used for anything.

First, she is a person, not a datum. Everything sociology learned from her life was learned at her expense, by people who also failed her.

Second, and this is the methodological point that matters most: her case cannot tell us what it is usually said to tell us. She was not merely un-socialised. She was starved, beaten, deprived of movement and light, and possibly — the record is disputed — developmentally atypical before the confinement began. There is no way to separate the effect of missing socialisation from the effect of eleven years of torture.

The idea, in plain words

The cases, and what they can and cannot support

Kingsley Davis published two accounts in the 1940s that appear in almost every textbook. Anna, discovered at about six, tied in an attic, unable to speak or walk, who made limited progress before dying at ten. Isabelle, discovered at about six and a half, who had been isolated with a mother who could not speak, and who — with intensive systematic training — reached apparently normal speech and schooling within two years.

The contrast is instructive and it is also a very small sample with poor records, no controls, and confounded conditions. Davis himself was more careful than his summarisers.

The "wolf children" of Midnapore deserve particular mention for Indian readers, because they are widely repeated as fact. In 1926 a missionary, J. A. L. Singh, reported having recovered two girls, Amala and Kamala, from a wolf den in Bengal, and described them as behaving in wolf-like ways. The account was published, translated and cited for decades.

It has been substantially discredited. The French surgeon Serge Aroles, working from records, and other investigators have found the diary evidence inconsistent, the photographs staged, contemporaneous witnesses contradicting the account, and the children's condition better explained by severe congenital disability and neglect. Similar analyses have dismantled most historical feral-child claims.

The lesson for you as a student is exactly 1.4.6's: a story being famous, moving and endlessly repeated is not evidence. Ask what the records actually show and who checked.

Better evidence: the Romanian orphanage studies

There is a body of research that does what the feral cases cannot, and it should be your reference point instead.

After 1989, large numbers of children who had spent their early lives in severely under-stimulating Romanian institutions were adopted into families in Britain and elsewhere. Researchers — most notably the English and Romanian Adoptees (ERA) study led by Michael Rutter and colleagues, and the later Bucharest Early Intervention Project — followed them for decades.

Why this is better evidence: the numbers are substantial, there are comparison groups (children adopted domestically, and children who left the institutions at different ages), the follow-up is long, and the deprivation, while severe, was not accompanied by the individual torture that confounds the feral cases.

The broad findings, stated carefully:

Recovery is substantial and real. Many children showed dramatic catch-up in physical growth and cognitive functioning after adoption into ordinary families. Early deprivation is not a sentence.

Duration matters, and there appears to be a threshold. Children who left institutional care before roughly the first six months showed outcomes broadly comparable to non-deprived adoptees. Those who experienced more than about six months of severe deprivation showed a raised likelihood of persistent difficulties into adulthood — in attention, social relating and mental health — even after many years in good families.

And the effects are probabilistic, not universal. A raised likelihood is not a determination; a substantial proportion of the longer-deprived group did well.

That is a much more defensible evidence base than any anecdote, and it supports a sociologically important conclusion: early social environment has large, measurable, partly persistent effects — and human beings are considerably more repairable than the dramatic cases suggest.

You will meet claims that some trait is "60 per cent genetic." Almost everyone, including many people who use the number, misunderstands what it means. Getting this right will make you a better reader for life.

Heritability is a statistic about a population, not about a person. It reports the proportion of the variation in a trait, within a particular population at a particular time, that is statistically associated with genetic variation. It says nothing whatever about how much of any individual's trait is caused by genes. A heritability of 0.6 for height does not mean 60 per cent of your height is genetic.

Heritability depends on the environment, and this is the crucial sociological point. If you equalise environments, heritability goes up — because if everyone is fed equally well, the remaining differences in height are more purely genetic. If environments are unequal, heritability goes down.

Consequence, and it is counterintuitive enough to be worth sitting with: a high heritability for educational attainment in a society may indicate that the society's opportunities are relatively equal, not that education is fixed by genes. And a low heritability may indicate that environmental inequality is doing so much work that genetic differences barely show. Research consistent with this pattern has found the heritability of cognitive test scores to be lower among poorer families and higher among richer ones — precisely what you would expect if deprivation constrains outcomes regardless of endowment.

And heritability says nothing about malleability. Vision needs correcting is highly heritable and is fixed with spectacles.

Finally, group differences are a separate question entirely. Heritability within groups implies nothing about the causes of differences between groups. This is not a technicality; it is the point on which a century of misuse turns, and it has been the standard finding of population genetics for decades.

Go deeper

The framing itself is wrong

"Nature versus nurture" implies two separable contributions that can be added. Almost nothing in human development works that way.

Gene–environment interaction. The effect of a genetic variant frequently depends on the environment, and vice versa. A predisposition may express itself under stress and not otherwise. So the question "how much is genetic?" has no context-free answer — it is like asking whether the area of a rectangle is due to its length or its width.

Gene–environment correlation. Environments are not randomly assigned. Parents supply both genes and upbringing; children with particular dispositions elicit particular responses and select particular niches. This makes the two extremely hard to disentangle even in principle, and it is why twin and adoption designs are cleverer than they look and still limited.

Developmental plasticity. The nervous system develops in response to input. There is no stage at which a finished biological human meets an environment; the environment is part of the construction.

And epigenetics — changes in gene expression influenced by environment — is often cited here, sometimes with more confidence than the evidence supports. The honest position: it is a real and active field, the evidence for stable transgenerational inheritance in humans is contested, and it should be used as a reason to reject simple genetic determinism, not as a slogan.

What sociology actually claims

Given all that, sociology's position is narrower and better supported than the popular "blank slate" caricature.

Human beings are obligately social. Not merely benefited by society — dependent on it for normal development. Language, self-awareness, moral reasoning and the capacity to take another's perspective do not appear without social input at the ordinary ages. This is the one thing the deprivation literature does support, and the Romanian evidence supports it with better method.

The capacity is biological; the content is social. Every typical human can acquire a language. Which language, and therefore which categories, distinctions and courtesies (2.1.5), is entirely social. The same holds for kinship, disgust, honour, gender and the self.

And the variation sociologists study is largely social variation. Nobody in sociology denies that individuals differ biologically. The claim is that differences between groups and across time — in literacy, mortality, occupation, aspiration, family form — move far too fast and vary far too much with arrangements to be explained by biology. Literacy in a population can go from ten to ninety per cent in two generations. Genes do not do that.

Why the argument is politically charged

You should know why this debate is not merely technical, because you will encounter it heated.

Claims that group differences in outcomes are biologically fixed have been used, repeatedly and across societies, to justify existing hierarchies: colonial rule, caste, slavery, the exclusion of women from education, immigration restriction, and sterilisation programmes. Each such claim has been asserted with confidence and has failed under examination — which is a strong prior, and also, note carefully, not by itself an argument (1.4.6 again: the badness of a claim's history is not evidence about its truth).

The correct posture is neither dismissal nor credulity. It is to hold biological claims about social outcomes to the same standard as any other: what exactly is the mechanism, what is the evidence, what would refute it, and — the question this lesson exists to teach — is the statistic being used to mean what it actually means?

And note that sociology has its own failure mode here, which 1.5.3 named: denying biology entirely, which is unnecessary and makes the discipline easier to dismiss. A sociology that engages the evidence seriously is far better placed to show why claims of innate group difference fail.

"Feral children prove socialisation makes us human." They cannot, because isolation never comes without abuse and malnutrition. Use the Romanian adoption studies instead — better numbers, comparison groups, long follow-up.

"The wolf children of Midnapore." Substantially discredited. Do not repeat it as fact.

"Heritability of 60 per cent means 60 per cent of the trait is genetic in me." It is a population variance statistic. It says nothing about an individual, and it changes when environments change.

"High heritability means unchangeable." Spectacles. Also: heritability rises as environments equalise, so a high figure may be evidence of equal opportunity rather than of fixity.

"Heritability within groups explains differences between groups." It does not. This is the single most consequential error in this area.

"Sociology says we are blank slates." It says humans are obligately social, that the capacity is biological and the content social, and that the variation it studies moves far too fast to be biological.

"There is a hard cut-off for language acquisition." The evidence supports declining facility with age and is not consistent with a sharp switch. Genie's case is too confounded to settle it.

Why it matters

It establishes the necessity of socialisation — the premise the whole of Part 2 has been resting on, now argued rather than assumed. Human beings do not arrive finished. Something has to happen, and Topic 2.3 is about what.

It teaches you to read a statistic before believing it. Heritability is the case study, and the skill transfers to everything in Part 7: know what the number actually measures before you let it change your mind.

It gives you the right posture towards biology. Not denial, not deference — the same standards you would apply to any claim, plus a specific alertness to the heritability confusions that make weak claims look strong.

And it should leave you with a fact worth carrying: a human being deprived of society for eleven years could still learn thousands of words. Repair is real, it is partial, and it is more possible than the dramatic stories suggest.

Socialisation is the lifelong process of acquiring a society's language, skills, norms, values and self-understandings.

Cases of extreme isolation — Genie, Anna, Isabelle — are ethically compromised and methodologically uninterpretable, because deprivation of society never comes without abuse and malnutrition. The Midnapore "wolf children" are substantially discredited.

Better evidence comes from the Romanian adoption studies (ERA; Bucharest Early Intervention Project): substantial recovery is real; duration of deprivation matters with a threshold around six months; effects are probabilistic, not determining.

Heritability is a population variance statistic, not a statement about individuals; it rises as environments equalise; it says nothing about malleability; and within-group heritability implies nothing about between-group differences.

The nature–nurture framing is itself wrong: gene–environment interaction, gene–environment correlation and developmental plasticity mean the contributions are not separable ingredients.

Sociology's actual claim: humans are obligately social; the capacity is biological and the content social; and the variation the discipline studies moves far too fast to be biological.

Socialisation — the lifelong process by which people acquire the culture and competences of their society.

Nature–nurture debate — the contested division between biological inheritance and social environment as sources of human characteristics.

Feral child — a child alleged to have grown up without human contact; almost all documented claims are unreliable.

Deprivation studies — research on children raised in severely under-stimulating institutions.

Critical / sensitive period — a developmental window during which particular input is especially effective; better evidenced as gradual decline than sharp cut-off.

Heritability — the proportion of variation in a trait within a population associated with genetic variation; environment-dependent and not about individuals.

Gene–environment interaction — the dependence of a genetic effect on environmental conditions.

Gene–environment correlation — the non-random association of genetic endowment with environments.

Developmental plasticity — the shaping of biological development by environmental input.

Epigenetics — environmentally influenced changes in gene expression; a real field, often overstated.

Obligately social — dependent on social interaction for normal development, not merely benefited by it.

One — check a statistic. Find one published claim that a trait is "X per cent genetic." Work out whether the source means heritability, and whether it is being used correctly. This exercise is more useful than any amount of arguing.

Two — list what had to be taught. Write down ten things you can do that a newborn cannot and that no biological maturation alone would produce: reading, queueing, using a currency, greeting, apologising. That list is what socialisation delivers.

Three — trace a "natural" reaction. Take one response you would call instinctive — disgust, embarrassment, deference to a particular kind of person. Ask what evidence there is that it is not learned (1.1.3 already did half this work).

Four — the honest posture. Write two paragraphs: one making the strongest case that a difference you care about is socially produced, one making the strongest case that biology contributes. Then state what evidence would settle it. This is 1.5.3's discipline, applied to the hardest case.