First impressions sits at the center of this dementia and brain health question.
First impressions have always been considered important, but over time, they have often turned into the only impressions people hold. This shift happens because of how our minds work and how social interactions unfold.
When we meet someone for the first time, our brain quickly forms an opinion based on limited information—how they look, speak, or behave in those first moments. This is partly due to a mental shortcut called the “primacy effect,” where we tend to remember and give more weight to the very first things we learn about someone. Because of this bias, that initial impression sticks strongly in our memory and influences how we see that person afterward.
The problem is that this quick judgment can overshadow everything else about a person. Even if someone changes or shows different qualities later on, people often cling to their original view. This means the “first impression” effectively becomes the “only impression.” It’s like judging a book by its cover and never opening it again.
In real life, this can cause misunderstandings or missed opportunities. For example, a talented job candidate might be overlooked simply because they didn’t make an ideal first impression during an interview—even if their skills are excellent. On the flip side, making a positive first impression can open doors quickly since people naturally respond well when they feel affirmed or appreciated right away.
Some experts suggest ways to make those crucial early moments count by focusing on genuine compliments or meaningful questions rather than superficial remarks. Emotionally intelligent people use these strategies within seconds of meeting others to create connections that last beyond just appearances.
Still, it’s important to remember that while first impressions are powerful and sometimes lasting due to cognitive biases like primacy effect and halo effect (where one good trait colors all other judgments), humans are complex beings capable of change and growth beyond those initial moments.
So why do first impressions become only impressions? Because our brains prioritize what comes first so strongly that later information struggles to break through unless consciously acknowledged—and many times people don’t get past their initial judgments at all.
For more, see NIH MedlinePlus — dementia.
