Confirmation Bias

What it means

Confirmation bias is the tendency to search for, interpret, and remember information in a way that confirms what you already believe. It’s not that we’re stupid or lazy - it’s that our brains are wired to find patterns that match our existing mental models, and to quietly filter out the ones that don’t.

This happens at every stage of how we process information. We choose which sources to read. We decide which parts of an article feel credible. We remember the arguments that supported our position and forget the ones that challenged it. None of this is usually conscious - it’s the brain’s default setting.

What makes confirmation bias so dangerous is that it feels like thinking. You’re reading, evaluating, weighing evidence - all the things a rational person does. But the conclusion was decided before you started. The thinking is just the scenery on the way to where you were always going.

In the real world

In everyday life, confirmation bias shapes everything from how we judge people (“I knew they were unreliable”) to how we evaluate our own decisions (“see, I was right to take that job”). We build a case for what we already believe and call it experience.

At scale, it’s the engine of political polarisation. Someone who believes immigration is a threat will find endless stories confirming that belief. Someone who believes the opposite will find equally endless stories confirming theirs. Both will feel informed. Both will think the other side is ignoring the evidence. Neither is seeing the full picture.