Overview
Robert Sapolsky explores the biology of human behavior by working backward from the moment an action occurs.
Sapolsky is a Stanford neurobiologist whose research on stress, baboons, and hierarchy is widely known in the field. Behave, published in 2017, is his attempt to explain human behaviour at every timescale — from the neural millisecond before an action to the millions of years of evolutionary pressure that shaped it. The book is 800 pages and treats no topic casually.
Key Ideas
Context is everything
The same brain region or gene can produce different behaviors depending on context.
Us versus them is hardwired
The brain categorizes people into groups within milliseconds, but criteria are learned.
Free will is complicated
The more we understand biology, the harder simple notions of free will become.
Who should read this
Serious readers willing to commit time to a long, dense, careful book on why humans do what we do. Sapolsky is unusually honest about where the research is uncertain, and the book's greatest strength is showing how different levels of explanation (genetic, hormonal, cultural, political) must be integrated rather than treated as rivals.
Who might skip it
Skip if you want a quick read — this is not that book, and Sapolsky makes no concessions to the time-poor reader. Skip also if you're not interested in academic-style argument; Sapolsky cites extensively and takes methodological issues seriously in the body of the text rather than in notes.
The verdict
The most thorough single-volume book on human behaviour I know of. Sapolsky is a great teacher in print — funny, patient, and always willing to say when a question is genuinely unresolved. The book rewards the investment. I return to specific chapters (particularly on adolescence and on Us versus Them) regularly.
"It is impossible to understand things with a single discipline."
— Robert Sapolsky, Behave
If you liked this
Why Zebras Don't Get Ulcers for the shorter Sapolsky book on stress. Determined, his 2023 book, extends the philosophical argument.