How Your Mind Tricks You
Ten shortcuts your brain takes without asking you. Some are famous and half wrong — those are labelled. Confirmation Bias · Memory Is Rebuilt, Not Replayed · Anchoring · Social Proof · Attention Has a Doorway · Dunning–Kruger, Honestly · The Sunk Cost Trap · Framing · The Placebo Effect, Precisely · Spotting Your Own.
Ages 14–16
What's inside
Confirmation Bias — hunting for agreement
Give a person an idea and they will go looking for reasons it is right. Almost nobody spontaneously goes looking for the one piece of evidence that would kill it. That asymmetry has a name, and it is probably the single most reliable finding in this whole world.
Memory Is Rebuilt, Not Replayed — not a video file
Remembering feels like opening a file. It is closer to telling the story again from a handful of surviving pieces, filling the gaps with what usually happens. Each retelling can quietly edit the original.
Anchoring — the first number wins
Show someone a number, any number, and then ask them to estimate something unrelated. Their guess drifts towards the number you showed. It is one of the least dignified things the mind does, and one of the best documented.
Social Proof — the room decides
When you do not know what to do, you look at what everyone else is doing. That is usually smart — other people carry information you do not have. It stops being smart the moment everyone else is also just looking around.
Attention Has a Doorway — looking is not seeing
Your eyes take in far more than your mind ever receives. Attention is the doorway between the two, and it is narrow enough that something enormous can walk past unnoticed. The unsettling part is that missing it feels exactly like nothing happened.
Dunning–Kruger, Honestly — the famous graph is fake
This is the most misquoted idea in popular psychology, so it is worth doing carefully. The version you have seen online — a curve with a 'peak of Mount Stupid' where beginners are wildly confident — comes from a webcomic and a slide deck, not from the research. What the papers actually reported is quieter, and what the critics say about it is quieter still.
The Sunk Cost Trap — already spent, still counting
Money, hours and effort you have already spent are gone regardless of what you do next. Your mind refuses to accept this and keeps them on the balance sheet. That is how people finish films they hate and stay in things that stopped being worth it months ago.
Framing — same fact, two feelings
The same information, worded two ways, produces two different decisions from the same person. Not because they were careless, but because the wording decides whether the situation feels like keeping something or losing something. Once you can hear the frame, you can hear a lot of persuasion working.
The Placebo Effect, Precisely — real, but limited
A pill with nothing in it can genuinely reduce how much pain someone reports. That is real and measurable. It is also much smaller and much narrower than the internet suggests, and confusing the two is how people end up trusting treatments that do nothing.
Spotting Your Own — the only one that counts
Everything in this world is worthless if you finish it only able to diagnose other people. Knowing the names makes that easier, not harder — it hands you a vocabulary for winning arguments instead of a method for being less wrong. This page is the antidote.
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