Topics Mind and behavior

What is confirmation bias?

Confirmation bias is the tendency to favor information that supports what we already believe, and to give less weight to information that cuts against it. It shows up in what we search for, what we notice, how we interpret ambiguous evidence, and what we remember afterward. It is not a sign of low intelligence. It is a common feature of how human minds work, and clever people can be very good at it.

What makes it interesting is that it rarely feels like bias. From the inside it feels like reasoning. You look at a fair-seeming set of facts and conclude you were right all along. Psychologists have studied versions of this for decades, and they still debate how much comes from motivation (we want to be right) and how much from ordinary mental shortcuts (it is easier to test an idea by looking for examples that fit it).

An episode on this topic would separate the pieces: biased search, biased interpretation and biased memory. It would look at where the bias costs people something, in health, money, work and arguments, and at what actually helps a little. bre's hosts are AI, so they can get things wrong, and you can press Talk to ask them to slow down or explain further.

What a bre episode would cover

An outline of the episode bre would make for this question. Every episode is written fresh when you ask, so yours will differ.

  1. What the term actually meansA plain definition, and how confirmation bias differs from simply having an opinion or being stubborn.
  2. Three places the bias hidesWhere we look for evidence, how we read ambiguous evidence, and what we remember later. Each can tilt toward what we already think.
  3. The classic experimentsA look at the well-known puzzle tasks where people test a rule by seeking examples that fit it instead of ones that could prove it wrong.
  4. Why the mind works this wayMental shortcuts, the comfort of being right, and the cost of constant doubt. Researchers disagree on how much each matters.
  5. Where it costs usHiring, diagnosis, investing, news and arguments with people we love, explained without telling you what to do.
  6. Search engines and feedsHow the way we choose sources can strengthen the bias, and what is still unclear about how large that effect is.
  7. What helps, and what does notWhy knowing about the bias does not cure it, and which habits, like deliberately seeking disconfirming evidence, seem to help a little.

How the episode might open

A sample exchange between two of bre’s AI hosts, bre and Cal. Both are AI; this is written by AI, as every bre episode is.

  1. breAI host

    Let's start with a small picture. You think a certain coffee shop is overpriced. Next time you go, which do you notice: the one pricey drink, or the three fair ones?

  2. CalAI host

    The pricey one. Every time. And honestly, I'd probably tell a friend about it, too, which makes it even more stuck in my head.

  3. breAI host

    That's confirmation bias in miniature. You're not lying to yourself. You're just collecting the evidence that already has a seat waiting for it.

  4. CalAI host

    Okay, but that sounds like everybody, not just people who are bad at thinking. Is it? Because I like to believe I'm decent at weighing things, and I suspect that's exactly the thing the bias would want me to believe.

  5. breAI host

    It is everybody, as far as we know. Being smart doesn't switch it off, and sometimes it gives you better arguments for what you already believed.

  6. CalAI host

    Great. So where does it actually start? Is it what I look up, what I notice, or what I remember a week later?

  7. breAI host

    All three, and that's the interesting part. I'll say upfront I don't think anyone has a clean answer on which one matters most, so let's take them one at a time.

Questions people also ask

What is an example of confirmation bias?
Suppose you believe a certain team always loses big games. You remember every loss vividly and shrug off the wins as flukes. Over time your memory seems to prove your belief, though it only reflects what you chose to notice and keep.
Is confirmation bias always bad?
Not always. Sticking with a well-supported view instead of rethinking everything saves effort, and testing an idea by looking for cases that fit it can be reasonable. It becomes a problem when it blocks you from noticing evidence that really would change your mind.
Can you get rid of confirmation bias?
Probably not entirely. Knowing about it does not make it vanish. Some habits seem to help a little, such as actively looking for the best case against your view, asking what would change your mind, and checking evidence before deciding which side you favor.
How is confirmation bias different from cognitive dissonance?
Confirmation bias is about how we gather and interpret evidence in favor of a belief. Cognitive dissonance is the discomfort of holding conflicting beliefs or acting against them. The two are related, since avoiding unwelcome evidence can be one way to reduce that discomfort.

Related topics

More: all 300 topics, mind and behavior, or the longer reads on /learn.

bre’s hosts are AI, and every episode is generated, so they can be wrong: check anything that matters. This page outlines what an episode would cover. It is for interest and learning, not medical, financial or legal advice.