Common Cognitive Biases

Cognitive biases are systematic shortcuts that the mind takes under uncertainty. Most of the time these shortcuts are useful — they let you form judgments quickly without having to laboriously weigh every piece of evidence. The trouble is that the same shortcuts also produce predictable errors, especially in complex or emotionally loaded situations. This exercise focuses on the biases that tend to do the most damage in everyday decisions: confirmation bias (seeking evidence that fits what we already believe), availability bias (judging likelihood by how easily examples come to mind), anchoring (over-relying on the first number or piece of information), and the Dunning-Kruger effect (low skill plus low awareness of that skill).

Knowing the names of these biases is not the same as being immune to them. Research consistently shows that people who can define confirmation bias are just as likely to commit it as people who cannot — the bias operates below conscious awareness. What actually reduces bias is a procedural habit: explicitly listing alternative explanations before committing to one, writing down what evidence would change your mind, checking whether your initial impression came from a vivid story or a representative sample, and looking for disconfirming data even when the confirming data feels abundant.

As you answer each question, try not to just pick the bias whose name sounds most familiar. Ask what is actually driving the character's error: is it that they stopped looking once they found one supporting piece of evidence (confirmation), that they over-weighted a recent vivid event (availability), that they adjusted insufficiently from a starting number (anchoring), or that they could not accurately gauge their own competence (Dunning-Kruger)? Different biases demand different countermeasures, so naming the right one matters. The Cognitive Biases: Memory & Self and Decision & Social lessons provide fuller treatment.