## 1. Identity **The Blank Slate: The Modern Denial of Human Nature** — Steven Pinker, 2002 (Spanish edition: *La Tabla Rasa*, Paidós). Pinker is a cognitive psychologist and linguist at Harvard. The book runs 638 pages plus 140 pages of notes. Source summary: polymatas.com/biblioteca/tabla-rasa (Spanish-language digest, 40 pages). ## 2. Core Thesis Pinker argues that three interlocking doctrines — the Blank Slate, the Noble Savage, and the Ghost in the Machine — have dominated Western intellectual life and distorted both science and politics. Each doctrine is empirically refuted by converging evidence from cognitive science, neuroscience, behavioural genetics, and evolutionary psychology. Accepting human nature does not threaten moral or political ideals; denying it is both scientifically untenable and practically dangerous. ## 3. Structure (five parts) **Part I — The Three Doctrines** Pinker identifies the Blank Slate (mind as passive receptacle of experience, traced to Locke), the Noble Savage (innate human goodness corrupted by society, attributed to Rousseau), and the Ghost in the Machine (a non-physical soul distinct from brain, labelled by Gilbert Ryle). He then marshals four sciences that collectively demolish them: cognitive science (computational theory of mind, modular architecture), neuroscience (all mental events have neural correlates), behavioural genetics (twin studies show ~50 % heritability of personality), and evolutionary psychology (universal behaviours across all documented cultures — over 300 identified by Donald Brown). **Part II — Fear and Suspicion** Pinker explains why these refuted doctrines persist. Post-eugenics trauma led the social sciences to embrace the Standard Social Science Model (constructivism, behaviourism), making the Blank Slate a moral talisman. E. O. Wilson's *Sociobiology* (1975) was met with campaigns, protests, and personal attacks when it applied evolutionary thinking to humans. Both left and right have ideological stakes in protecting the three doctrines. **Part III — Human Nature with a Human Face** The persistence of the doctrines rests on four fears: that innate differences justify inequality; that imperfectible human nature forecloses social progress; that biological determinism dissolves moral responsibility; and that evolutionary origins drain life of meaning. Pinker rejects each fear. Equality of rights does not require identity of endowments. Imperfection acknowledged allows institutions (checks and balances, markets, rule of law) to be designed with human nature in mind rather than against it. Biological causation does not erase responsibility; responsibility is a practical social mechanism, not a metaphysical property. Evolved origins do not devalue love, morality, or meaning. **Part IV — Know Thyself** Covers the evolutionary roots of social psychology: kinship, reciprocal altruism, coalition formation, emotions as adaptive programmes, moral intuitions and their limitations (the naturalistic and moralistic fallacies, the expansion of the moral circle via trade, language, and reason). **Part V — Hot Topics** Applies the framework to politics (tragic vs. utopian vision), violence (Hobbesian trap, expansion of the moral circle), gender (biological sex differences are real and do not justify discrimination), child-rearing (The Three Laws of Behavioural Genetics: all traits heritable; shared family environment has near-zero effect; the remainder explained by non-shared environment), and the arts (art as technology of pleasure grounded in evolved aesthetic preferences). ## 4. Key Empirical Claims - Identical twins reared apart converge in personality, IQ, and preferences far more than fraternal twins or non-twin siblings raised together. - Between 40 % and 50 % of personality variance is attributable to genes; shared family environment accounts for 0–10 %; the rest is non-shared individual environment (peers, chance). - Donald Brown catalogued over 300 universal human behaviours present in every documented society. - Neural damage studies (e.g. loss of empathy or planning after prefrontal lesions) show that every mental capacity is substrate-dependent. - Noam Chomsky's universal grammar: all human languages share a common deep structure, suggesting an innate language faculty. ## 5. Why It Matters The book situates scientific claims about human nature inside a broader argument about intellectual honesty and political risk. Both totalitarian mass-murder experiments of the 20th century (Nazism and Stalinism) aimed to rewrite human nature — through race and class respectively. Pinker's prescription is a "tragic" political vision: accept imperfection, design institutions that harness rather than suppress human tendencies, extend the moral circle through reason and empathy, and never subordinate empirical claims to ideological convenience. ## 6. Link to Original - polymatas.com/biblioteca/tabla-rasa - Original book: Pinker, S. (2002). *The Blank Slate: The Modern Denial of Human Nature*. Viking Press.