Prejudge based sits at the center of this dementia and brain health question.
We often make quick judgments about people based on their demographics—things like race, gender, age, or where they come from. This happens because our brains naturally sort the world into categories to help us understand it more easily. From a very young age, children start grouping people by visible traits such as skin color or gender. This categorizing is a normal part of how we process information.
However, problems arise when these categories become linked with ideas about status or worth. For example, if society teaches us that certain groups have more power or respect than others, we might unconsciously start to believe that those groups are better or more deserving. These beliefs often come from what we hear at home, see in our communities, and consume through media and culture.
This connection between group characteristics and social value leads to bias—a preference for some groups over others that is unfair and close-minded. Bias can then turn into prejudice: negative attitudes toward people simply because of the group they belong to rather than who they really are as individuals.
Emotions play a big role too. Fear and anxiety can make us feel threatened by people who seem different from us. When we feel this way, it’s easier to favor those who are like us (our “ingroup”) and look down on those who aren’t (the “outgroup”). This creates an “us versus them” mindset that fuels prejudice even further.
Sometimes people also use reasoning not just to understand but to justify their biases—finding reasons why their views make sense even if they’re unfair. This helps maintain prejudiced attitudes without feeling guilty about them.
Interestingly, research shows that many people’s feelings about demographic changes in society don’t shift easily anymore because these views have become deeply ingrained over time through ongoing public conversations around race and identity.
In short, prejudging based on demographics happens because our brains categorize quickly for simplicity; societal messages attach value unfairly; emotions like fear push us toward favoritism of familiar groups; and motivated reasoning keeps these biases alive despite evidence against them—all combining into patterns of prejudice baked into everyday life without most of us realizing it fully.
For more, see National Institute on Aging.
