Editors Reads Verdict
Sapolsky's most controversial book and his most important — a comprehensive scientific argument for determinism that has real implications for how we think about punishment, responsibility, and human dignity.
What We Loved
- The scientific synthesis is comprehensive — Sapolsky draws on neuroscience, genetics, endocrinology, and development to build a cumulative argument
- The writing retains the wit and accessibility of Behave while handling more abstract philosophical territory
- The moral and legal implications are worked out with care rather than hand-waved
Minor Drawbacks
- The philosophical sections will frustrate readers with backgrounds in philosophy of action, who will find his engagement with compatibilism insufficiently rigorous
- The book's length means it covers some ground more than once
Key Takeaways
- → Every behavior is the product of prior causes — biology, environment, culture, development — that trace back to before the person existed
- → Compatibilism (reconciling free will with determinism) may be philosophically coherent but doesn't justify the emotional, moral, and legal weight we put on 'responsibility'
- → A world that took determinism seriously would still need to prevent harmful behavior, but would do so through rehabilitation rather than retribution
| Author | Robert Sapolsky |
|---|---|
| Publisher | Penguin Press |
| Pages | 528 |
| Published | October 17, 2023 |
| Language | English |
| Genre | Non-Fiction, Science, Philosophy |
Determined Review
Determined is Robert Sapolsky’s follow-up to his masterwork Behave, and it takes the argument of that book to its logical conclusion. Behave demonstrated that every human behavior is the product of biological, developmental, cultural, and environmental causes operating across multiple timescales. Determined argues that this accumulation of prior causes leaves no room for the kind of free will that could justify moral responsibility in any robust sense — and that we should revise our institutions accordingly.
The book proceeds by exhaustive elimination. Sapolsky surveys the neuroscience of decision-making (the brain prepares for action before we are consciously aware of deciding), the genetics of behavior (not genetic determinism, but genes interacting with environment), developmental biology, the endocrinology of stress and reward, the role of culture and history — and argues that at each level, causes precede choices in ways that leave no foothold for an uncaused causer. The argument is cumulative: no single study is decisive, but the convergence from multiple directions is, Sapolsky contends, overwhelming.
The philosophical chapter — where Sapolsky engages with compatibilism, the view that free will is compatible with determinism — is the book’s most contested section. Compatibilists argue that ‘free will’ properly understood just means acting from one’s own desires and reasons, without external compulsion, and that this kind is compatible with those desires and reasons being themselves caused. Sapolsky replies that this redefinition doesn’t preserve the moral and legal weight we actually want free will to carry. The debate is genuinely open, and philosophers will find his treatment inadequate; but his larger point — that our intuitive notions of desert and blame go well beyond what the science can support — is harder to dismiss.
The final sections, on what a post-free-will ethics and legal system might look like, are the most speculative and the most important.
Frequently Asked Questions
What is "Determined: A Science of Life Without Free Will" about?
The follow-up to Behave makes the full case that free will is an illusion — that every decision we make is the product of biology, environment, and history we did not choose. Sapolsky argues this should change not just our self-understanding but the moral and legal frameworks we use to judge human behavior.
What are the key takeaways from "Determined: A Science of Life Without Free Will"?
Every behavior is the product of prior causes — biology, environment, culture, development — that trace back to before the person existed Compatibilism (reconciling free will with determinism) may be philosophically coherent but doesn't justify the emotional, moral, and legal weight we put on 'responsibility' A world that took determinism seriously would still need to prevent harmful behavior, but would do so through rehabilitation rather than retribution
Is "Determined: A Science of Life Without Free Will" worth reading?
Sapolsky's most controversial book and his most important — a comprehensive scientific argument for determinism that has real implications for how we think about punishment, responsibility, and human dignity.
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