Cognitive biases

Working definition

A cognitive bias is a systematic deviation in a judgment or a decision. It is not the same thing as a heuristic.

A heuristic is a mental shortcut: it lets us resolve a situation with limited time, incomplete information, and finite attention. It usually reduces effort and often works. Bias appears when that shortcut produces a predictable error: anchoring on the first reference, evaluating the same figure differently according to the frame, or favoring evidence that confirms what we already believed.

That is why it would be incorrect to define biases simply as “mental shortcuts.” The shortcut is the mechanism. The bias is the deviation that, under certain conditions, that mechanism introduces.

Why it matters in UX

An interface is not a neutral background. It decides what appears first, what is compared, what stays selected, and how consequences are described. That changes the decision context even when the options themselves are the same.

Biases are not only on the side of the person using the product. Designers, researchers, and stakeholders use the same mechanisms: a recent complaint can seem more frequent than it is, and a study can confirm a hypothesis because compatible evidence was what got attention.

Design should not try to eliminate heuristics. Without them, using a product would be exhausting. The useful question is what conditions we are creating around the decision, and whether the person can understand its consequences.

The article Cognitive biases in UX develops anchoring, framing, loss aversion, status quo, availability, confirmation bias, and a practical audit for interfaces.

How it relates to other concepts

• Analytical thinking introduces friction between intuition and conclusion.
• Critical thinking examines whether the evidence confirms or could refute what we expected.
• Decision making turns that analysis into an explicit, reviewable choice.