Determined: A Science of Life without Free Will

· Sold by Penguin
22 reviews
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528
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The instant New York Times bestseller

“Excellent . . . Outstanding for its breadth of research, the liveliness of the writing, and the depth of humanity it conveys.” –Wall Street Journal

One of our great behavioral scientists, the bestselling author of Behave, mounts a devastating scientific and philosophical case against free will—an argument with profound consequences


Robert Sapolsky’s Behave, his now classic account of why humans do good and why they do bad, pointed toward an unsettling conclusion: we may not grasp exactly how nature and nurture create the physics and chemistry that cause all human behavior, but that doesn’t mean they don’t exist. In Determined, Sapolsky takes his argument all the way, mounting a brilliant (and in his inimitable way, delightful) full-frontal assault on the pleasant fantasy that there is some separate self who tells our biology what to do.

Determined offers a marvelous synthesis of what we know about consciousness—the tight weave between reason and emotion and between stimulus and response in the moment and over a life. One by one, Sapolsky takes out all the major arguments for free will, cutting a path through the thickets of chaos theory and quantum physics. But as Sapolsky acknowledges, it’s sometimes impossible to uncouple from our zeal to judge people, including ourselves. Determined applies this new understanding to some of our most essential questions around punishment, morality, and living well together. Most of all, Sapolsky argues that while accepting the reality about free will is monumentally difficult, it will make for a much more humane world.
The instant New York Times bestseller “Excellent . . . Outstanding for its breadth of research, the liveliness of the writing, and the depth of humanity it conveys.” –Wall Street Journal One of our great behavioral scientists, the bestselling author of Behave, mounts a devastating scientific an...

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Ratings and reviews

22 reviews
Andrew G
September 17, 2025
Simply the most humane book I've ever read. This book dismantles the myth of moral desert, and it is liberating. But it also sets the stage for a society that is more just, civilized and rational than anything we have today. This is hugely ironic for the proposition that we are nothing more or less than animals, biological machines reacting to and learning from our environment. Abandoning the belief in free will and all the gross behavior that comes with it is what can truly set us apart from the "animals" once and for all. That's because we humans are capable of understanding our own nervous system, which may be more complex than those of other animals but is, Sapolsky shows in detail, fundamentally the same. Attraction, aversion, learning, personality traits, tendencies to do this or that - all are, fundamentally, about the material realities of our brain. The sometimes gentlemanly Sapolsky doesn't come out and say this, but it's glaringly evident by the time you finish the first half: There is very strong scientific evidence that we don't have free will, and - with no exaggeration here - zero scientific evidence that we do. Once we all get how our brains truly work, we can finally realize that praise and blame, the things holding us back from truly being kind to ourselves and each other, are chimeras. And Sapolsky shows us, we've done it before - as seen in our increasingly liberal attitudes towards epileptics, schizophrenics, gays and lesbians, those with depression, and many others. We can choose the myth of desert, and all the illusory and pointless feeling good and bad about ourselves, or we can simply choose to be kind.
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JN27
January 5, 2025
Presentation fidelity: 1 single grammatical mistake (affect vs effect, but I won't tell you where) in this digital version, but otherwise immaculate version. Vitally, all the links back and forth between main text, references, footnotes, index, etc. seem to work great, which definitely makes up for the digital's version inability to be flipped through quickly to find things, compared to a paper book. All the illustrations are there, and you definitely feel like you're getting the complete package when shelling out your hard earned mula for a digital book. Content: Sapolsky's writing is refreshingly charming & humourous, while also being sharply logical without being dry at all.
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Luc Trepanier
September 9, 2026
Well written, accessible, even funny. Sapolsky makes a good case against free will. However, he skims a bit too fast over emergent systems, and forgets that information is independent of the substrate where it resides. The jury is still out on free will and consciousness. But the book has the merit of clarifying the position and arguments of one side of the debate.
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About the author

Robert M. Sapolsky is the author of several works of nonfiction, including A Primate’s Memoir, The Trouble with Testosterone, and Why Zebras Don’t Get Ulcers. His most recent book, Behave, was a New York Times bestseller and named a best book of the year by The Washington Post and The Wall Street Journal. He is a professor of biology and neurology at Stanford University and the recipient of a MacArthur Foundation “Genius Grant.” He and his wife live in San Francisco.
Robert M. Sapolsky is the author of several works of nonfiction, including A Primate’s Memoir, The Trouble with Testosterone, and Why Zebras Don’t Get Ulcers. His most recent book, Behave, was a New York Times bestseller and named a best book of the year by The Washington Post and The Wall Street...

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