Daily Junction.mobi portalEducation · November 19, 2023 · Tom Bennett · 6 min
The curse of knowledge is the bias that makes experts forget what it is like not to know something. Here is why it makes us poor explainers and how to break the spell.
Ask an expert to explain their subject and something strange often happens. They are brilliant, fluent, generous with their time — and completely baffling. They use words you have never met, leap over the steps that confused you most, and answer the question they think you asked rather than the one you did. It is not arrogance and it is rarely impatience. It is a well-documented quirk of the human mind called the curse of knowledge, and almost everyone who teaches, writes or manages others falls under its spell.
The curse of knowledge is a cognitive bias in which knowing something makes it hard to imagine not knowing it. Once a piece of information is lodged in your head, you lose easy access to the mental state you were in before you had it — so you consistently overestimate how obvious that information is to other people.
The bias was named and explored by economists and psychologists studying why well-informed people make poor predictions about the less-informed. The finding was strong and slightly uncomfortable: the more you know about a topic, the worse you tend to become at judging what a beginner needs to hear. Your expertise, the very thing that should make you a good explainer, quietly works against you.
A classic demonstration involves "tappers and listeners." One person taps out the rhythm of a famous song on a table; another tries to name it. The tappers, hearing the full tune in their heads, are confident the listeners will easily guess it. In reality the listeners almost never can. The tappers cannot un-hear the melody, so they cannot imagine how meaningless the bare taps sound to someone else. That gap is the curse of knowledge in miniature.
The root cause is that memory does not store a tidy timeline of how you learned things. You remember the destination — the concept, the skill, the fact — far more vividly than the journey that got you there. The hours of confusion, the dead ends, the moment something finally clicked: these fade, while the polished end result remains.
So when you explain, you reconstruct from the end result. You see the topic as a connected, sensible whole, because for you it is. You forget that for the newcomer it is a scatter of unfamiliar pieces with no obvious links between them. The connections that feel like common sense to you are precisely the connections they have not yet made.
The curse of knowledge is everywhere once you start looking:
The result, in each case, is the same: communication that feels crystal clear to the person giving it and frustratingly opaque to the person receiving it.
Almost everyone who knows more than their audience, which is to say almost everyone, at some point:
If you have ever been baffled by a "simple" set of furniture instructions, you have met someone else's curse of knowledge.
The good news is that the curse can be managed, though never quite cured. The strategies all share one theme: deliberately rebuilding the beginner's point of view, because you can no longer summon it naturally.
If an explanation feels almost too basic to you, it is probably about right for your audience.
At heart, the curse of knowledge is a failure to monitor the gap between what you know and what your listener knows. That kind of self-monitoring — thinking about your own thinking and how it differs from someone else's — is exactly what metacognition describes. Strong metacognitive habits are one of the best defences against the bias, because they prompt you to ask, before you speak, "what does this person already have in their head, and what am I taking for granted?" The skill of stepping outside your own understanding is the same skill that makes for good study and learning strategies, where learners must honestly judge what they do and do not yet know.
The curse of knowledge is the bias that makes experts forget what it feels like to be a beginner. It is not a character flaw; it is a side effect of learning, and it afflicts the most knowledgeable people most strongly. Left unchecked, it produces jargon-laden, step-skipping explanations that lose the very people they are meant to help. The cure is humility and feedback in equal measure: test your explanations on real newcomers, define your terms, spell out the obvious, and remember that what is clear to you may be a closed book to everyone else.
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