The Intelligence Trap

The verdict

The Intelligence Trap addresses a question that deserves more attention than it gets: why do smart people do stupid things? David Robson, a science journalist, builds a compelling case that high intelligence, far from protecting against irrationality, can actually amplify it. The smarter you are, the better you are at constructing elaborate rationalizations for beliefs you hold for emotional or tribal reasons. IQ is a tool, and tools can be used to build or to destroy.

The book is not anti-intelligence. It is anti the assumption that intelligence alone produces wisdom. Robson argues that what matters for real-world judgment is not raw cognitive power but a combination of intelligence, intellectual humility, and what he calls evidence-based wisdom — the ability and willingness to follow evidence wherever it leads, even when it leads somewhere uncomfortable.

The intelligence paradox

The central paradox is well-documented in the psychological literature. Studies show that people with higher IQs are no less susceptible to many cognitive biases — and in some cases are more susceptible. The reason is that intelligence makes you better at motivated reasoning: the process of constructing arguments that support conclusions you have already reached for non-rational reasons.

When a smart person encounters evidence against a cherished belief, they do not update the belief. They deploy their intelligence to find flaws in the evidence, construct alternative explanations, and generate counterarguments. They do this more effectively than less intelligent people, which means they end up more confident in wrong beliefs, not less. The intelligence serves as a more powerful engine of self-deception.

This explains a phenomenon that puzzles many observers: why do brilliant scientists sometimes hold pseudoscientific beliefs? Why do successful businesspeople fall for obvious scams? Why do highly educated people join cults? The Intelligence Trap provides the answer: their intelligence protects the belief by constructing better defenses, not by testing it more rigorously.

Earned dogmatism and expertise

Robson documents the earned dogmatism effect: when people feel they have expertise in a domain, they become less receptive to new information, not more. The feeling of expertise generates confidence that reduces the motivation to keep learning. Experts rest on their laurels — they rely on patterns they have already identified rather than remaining alert to cases where those patterns break down.

This is particularly dangerous in rapidly changing fields where yesterday’s expertise may not apply to today’s problems. The expert doctor, lawyer, or investor who relies on pattern recognition developed over decades may miss signals that a novice with fresh eyes would catch. The expertise is real, but so is the complacency it generates.

Robson connects this to the Dunning-Kruger effect but inverts it. The popular version of Dunning-Kruger focuses on incompetent people overestimating their abilities. Robson emphasizes the less-discussed other side: highly competent people becoming rigid in their thinking precisely because they have been right so often before.

Dysrationalia

Robson introduces the concept of dysrationalia — a term coined by psychologist Keith Stanovich for the tendency to think irrationally despite adequate intelligence. Just as dyslexia describes difficulty reading despite adequate intelligence, dysrationalia describes difficulty thinking rationally despite adequate IQ.

The key insight is that rationality and intelligence are different things that require different cognitive resources. Intelligence is about processing power — how quickly and accurately you can manipulate information. Rationality is about calibration, open-mindedness, and the willingness to revise beliefs based on evidence. You can score in the ninety-ninth percentile on IQ tests and still be spectacularly miscalibrated in your judgments about the real world.

Evidence-based wisdom

Robson’s prescriptive section argues for cultivating what he calls evidence-based wisdom: a combination of intellectual humility (knowing the limits of your knowledge), emotional regulation (not letting feelings drive conclusions), and reflective reasoning (deliberately checking your intuitions against evidence).

The most practical suggestion is to develop what Benjamin Franklin called “the humility of doubt” — the habit of entertaining the possibility that you are wrong about things you feel certain about. Not paralytic doubt, but active, curious doubt that sends you looking for disconfirming evidence rather than confirming evidence.

Robson also recommends intellectual diversification — exposing yourself to perspectives and domains outside your expertise. Specialists who read only within their field develop rigid thinking patterns. Generalists who cross boundaries remain more intellectually flexible, though they sacrifice depth for breadth.

Read this if…

You consider yourself intelligent and want to understand the specific ways that intelligence can lead you astray. This book is particularly valuable for experts, leaders, and anyone in a position where overconfidence has high stakes. If you have ever been baffled by a smart person holding an obviously wrong belief, this book explains the mechanism.

Skip this if…

You want a tightly focused argument. The book covers a lot of ground — from Arthur Conan Doyle’s belief in fairies to the failures of NASA — and sometimes the connections between chapters feel loose. If you prefer a more disciplined treatment of the same themes, Julia Galef’s The Scout Mindset covers much of the same territory with greater precision.

Start here

Read Chapters 1-3 for the core paradox and the dysrationalia concept. Then jump to Chapter 8 on evidence-based wisdom and Chapter 10 on the art of successful learning. These chapters contain the most actionable ideas.