Cognitive biases and brain biology help explain why facts don’t change minds

Facts First” is the tagline of a CNN branding campaign which contends that “once facts are established, opinions can be formed.” The problem is that while it sounds logical, this appealing assertion is a fallacy not supported by research.

Cognitive psychology and neuroscience studies have found that the exact opposite is often true when it comes to politics: People form opinions based on emotions, such as fear, contempt and anger, rather than relying on facts. New facts often do not change people’s minds.

I study human development, public health and behavior change. In my work, I see firsthand how hard it is to change someone’s mind and behaviors when they encounter new information that runs counter to their beliefs.

Your worldview, including beliefs and opinions, starts to form during childhood as you’re socialized within a particular cultural context. It gets reinforced over time by the social groups you keep, the media you consume, even how your brain functions. It influences how you think of yourself and how you interact with the world.

For many people, a challenge to their worldview feels like an attack on their personal identity and can cause them to harden their position. Here’s some of the research that explains why it’s natural to resist changing your mind – and how you can get better at making these shifts.

Rejecting what contradicts your beliefs

In an ideal world, rational people who encounter new evidence that contradicts their beliefs would evaluate the facts and change their views accordingly. But that’s generally not how things go in the real world.

Partly to blame is a cognitive bias that can kick in when people encounter evidence that runs counter to their beliefs. Instead of reevaluating what they’ve believed up until now, people tend to reject the incompatible evidence. Psychologists call this phenomenon belief perseverance. Everyone can fall prey to this ingrained way of thinking.

Being presented with facts – whether via the news, social media or one-on-one conversations – that suggest their current beliefs are wrong causes people to feel threatened. This reaction is particularly strong when the beliefs in question are aligned with your political and personal identities. It can feel like an attack on you if one of your strongly held beliefs is challenged.

Confronting facts that don’t line up with your worldview may trigger a “backfire effect,” which can end up strengthening your original position and beliefs, particularly with politically charged issues. Researchers have identified this phenomenon in a number of studies, including ones about opinions toward climate change mitigation policies and attitudes toward childhood vaccinations.

Focusing on what confirms your beliefs

There’s another cognitive bias that can get in the way of changing your mind, called confirmation bias. It’s the natural tendency to seek out information or interpret things in a way that

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