Someone seems distant at a family gathering. A new colleague stumbles through an introduction. A neighbour greets you with unexpected warmth. From a few moments, you begin forming a picture of who they are. But what happens when their later behaviour does not fit that picture?
First impressions can help us navigate unfamiliar situations, but they are built from limited information. They may reflect something meaningful—or capture someone who is tired, nervous, distracted, or simply behaving differently in an unfamiliar setting. Here are five reasons those early judgments can be difficult to revise.
1. The first information becomes a frame for everything that follows
The primacy effect is the tendency for information encountered first to carry more weight in an overall impression. Rather than treating every interaction as a fresh start, we may interpret new behaviour through the picture we have already formed.
Imagine meeting a colleague who speaks very little during their first team discussion. If your initial impression is “not interested,” their quietness in the next meeting may seem to confirm it. You might give less weight to the thoughtful suggestions they send afterwards, even though those suggestions offer a different view of their involvement.
Try this: treat an early impression as a working guess, not a settled description. Ask, “If I had seen these behaviours in the opposite order, would I feel differently about this person?”
2. We notice evidence that fits our existing view
Confirmation bias means favouring information that supports what we already believe, while overlooking or explaining away information that challenges it. A cognitive bias is a recurring tendency in thinking that can shape judgment without our noticing. Confirmation bias can make an early impression feel increasingly convincing.
Suppose someone arrives late the first time you meet, and you decide they are unreliable. You may remember their next delayed reply clearly but barely register the times they follow through. The issue is not necessarily that your first concern was wrong; it is that you may be collecting an uneven sample of evidence.
Try this: deliberately look for information that does not fit your view. Ask, “What have they done that challenges my impression?” Consider patterns over time rather than counting only the moments that stand out.
3. We mistake a moment for a personality trait
An attribution is an explanation we give for someone’s behaviour. When forming an impression, we may attribute an action to personality—“They are rude”—while giving too little attention to the situation. A brief encounter can then become a lasting label.
For example, a person who gives short answers at a gathering may seem unfriendly. They could also be preoccupied, uncomfortable in a noisy room, or less confident in the language being spoken. These possibilities do not establish what happened; they remind us that the same behaviour can have several explanations. Expectations around conversation, eye contact, and formality can also differ across settings and cultures.
Try this: separate observation from interpretation. “They gave brief answers” describes what you noticed. “They dislike me” adds a conclusion. Before settling on that conclusion, consider what context you may be missing.
4. One striking quality colours our wider judgment
The halo effect occurs when a favourable impression in one area influences our judgments in other areas. The negative version is sometimes called the horn effect: one unfavourable quality casts a shadow over the rest. Both can turn a narrow observation into a much broader assessment.
A confident speaker may quickly seem capable and trustworthy, even before you know how they handle responsibilities. Someone who appears awkward during an introduction may be underestimated despite having relevant skills. Confidence, warmth, competence, and reliability are different qualities; evidence of one does not automatically establish the others.
Try this: make your judgment more specific. Instead of “They are impressive,” ask, “What exactly impressed me, and what do I still need to learn?” This helps keep one quality from doing all the work.
5. Our expectations can shape the next interaction
First impressions do not only influence what we think. They can influence how we behave. A self-fulfilling prophecy is a process in which an expectation changes our actions in ways that help bring about the response we expected. This is a possibility, not an inevitable outcome.
If you assume a neighbour does not want to talk, you might stop greeting them or keep conversations unusually brief. They may respond with similar distance. Their response can then appear to prove your original impression, even though the interaction may have been shaped partly by both people’s behaviour.
Try this: where it feels appropriate and safe, offer a small, neutral opening—a greeting, an invitation to contribute, or an ordinary question. Notice whether the response gives you new information. You do not need to force closeness or take sole responsibility for the relationship.
Leave room for a fuller picture
Reconsidering a first impression does not mean ignoring repeated disrespect, dismissing a concern, or giving everyone unlimited chances. It means matching the strength of your conclusion to the amount and quality of information you have.
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