Psychology says people are more likely to trust someone who admits small mistakes

Have you ever met someone and instantly decided they seemed trustworthy, confident or unfriendly before they even finished introducing themselves? Most people have experienced this without realizing it. Psychology says our brains are wired to make incredibly fast judgments about strangers, often in less than a second. These snap decisions helped our ancestors quickly assess potential threats, but in modern life they are far from perfect. Research suggests that while first impressions can sometimes be surprisingly accurate, they are also heavily influenced by unconscious biases, facial expressions, clothing, posture and even stereotypes.

As a result, the opinions we form almost instantly are often incomplete or simply incorrect. Psychologists say understanding why this happens can help us make fairer decisions, build better relationships and avoid judging people before we truly know them.

Your brain is built to make quick decisions

One of the best-known explanations comes from research on Thin Slicing, developed by psychologist Nalini Ambady.


Thin slicing refers to the brain's ability to draw conclusions about people from only a few seconds of observation. Ambady's studies found that people often make judgments about personality, confidence and competence after seeing very brief interactions.


Imagine walking into a meeting and immediately assuming someone is confident because they smile, maintain eye contact and speak calmly. Your brain has already created an impression before hearing many of their ideas.

These rapid judgments are automatic, but they are not always accurate.

The halo effect can fool your judgment

Another explanation comes from the Halo Effect, first described by psychologist Edward Thorndike.

The halo effect occurs when one positive characteristic influences how we evaluate everything else about a person.

For example, if someone appears attractive or well-dressed, we may automatically assume they are intelligent, kind or successful, even without evidence.

Similarly, someone who looks tired or nervous during a first meeting might be unfairly judged as less capable, even if they are highly skilled.

Psychologists say this mental shortcut helps the brain process information quickly but can also lead to inaccurate conclusions.

Once we form an opinion, we often look for proof

Another powerful psychological concept is Confirmation Bias, a term popularized through the work of psychologist Peter Wason.

Confirmation bias describes our tendency to notice information that supports our existing beliefs while overlooking evidence that contradicts them.

Imagine believing a new coworker is unfriendly because they seemed quiet during your first conversation. Over the following weeks, you may pay more attention when they decline invitations while ignoring the times they are warm and helpful with colleagues.


Instead of updating your opinion, your brain selectively collects evidence that confirms your first impression.

This is one reason inaccurate judgments can last much longer than they should.

Social perception depends on limited information

Psychologists also study Social Perception, which explains how people interpret the behavior, emotions and intentions of others.

The challenge is that first impressions are usually based on only a small amount of information.

For example, someone rushing through a grocery store without smiling may simply be late for an appointment. Yet another shopper might assume they are rude or unfriendly.

Without understanding another person's circumstances, our brains often fill in the missing details using assumptions rather than facts.

This process helps explain why first impressions frequently miss the bigger picture.

Fundamental attribution error changes how we see people

Another common thinking pattern is the Fundamental Attribution Error, identified by social psychologist Lee Ross.

This cognitive bias causes people to explain someone else's behavior by focusing on their personality instead of the situation they are experiencing.

Imagine a stranger cutting in front of you in traffic. Your immediate reaction may be to think they are selfish or impatient. In reality, they may be rushing to a hospital or responding to an emergency.

Psychologists say people naturally underestimate how strongly situations influence behavior, especially when evaluating strangers.

First impressions can change with time

Although our brains form rapid opinions, research shows these impressions are not permanent.

As we gather more information through conversations, shared experiences and repeated interactions, our understanding of someone usually becomes more accurate.

A coworker who first seemed distant may turn out to be thoughtful and supportive. A person who initially appeared extremely confident may later reveal moments of uncertainty or vulnerability.

Psychologists encourage people to treat first impressions as temporary hypotheses rather than final conclusions.

Keeping an open mind allows new information to replace inaccurate assumptions.

While first impressions are a natural part of human psychology, they are not always reliable. Taking time to learn more about people often reveals qualities that our brains simply cannot recognize in a split second.

FAQs

How quickly do people form first impressions?

Research suggests people can begin forming impressions of strangers within milliseconds based on facial expressions, body language and other visual cues.

Why are first impressions sometimes wrong?

First impressions are influenced by cognitive biases such as the Halo Effect and Confirmation Bias, which can lead people to make assumptions based on limited evidence.