People form impressions quickly. In a well-known 2006 study, Princeton psychologists Janine Willis and Alexander Todorov found that participants made judgments about unfamiliar faces after seeing them for just 100 milliseconds. Longer viewing did not necessarily change the overall direction of those initial judgments, although additional exposure could increase confidence and produce more differentiated impressions. The finding explains why a first glance can feel powerful. It does not prove that a snap judgment is accurate or that a person’s character can be read from a face.

What people notice in an introduction

Appearance is one cue, but it is only one part of a larger interaction. People may notice whether someone seems prepared for the setting, whether their expression appears welcoming, how clearly they speak, and whether they pay attention. Context changes the meaning of these cues: quietness at a formal meeting may be read differently from quietness at a lively party. Cultural expectations, accessibility needs, personality, stress, and familiarity also shape how behavior is interpreted.

Cue	What it can communicate	What not to assume
Presentation	Preparation for the setting	Wealth, character, or worth
Expression and tone	Current mood or conversational style	A permanent personality trait
Listening	Attention and respect	That someone has no worries
Follow-through	Reliability over time	That one mistake defines a person

Why first impressions can be wrong

A quick judgment is made with limited information. Someone may seem distracted because they are worried about a family matter, not because they are rude. A person who speaks confidently may be nervous underneath. Clothing can reflect budget, culture, disability, climate, or personal taste rather than character. Research on thin slices of behavior suggests that some traits can be judged better than others and that accuracy often improves when observers have more information. A brief glimpse is not the same as knowing someone.

How to make a positive first impression without performing

Start with the basics: arrive when you said you would, dress appropriately for the situation, introduce yourself clearly, and give the other person your attention. Comfortable eye contact can help in many settings, but it should never become a rigid rule; norms differ and some people communicate differently. Listen to the answer instead of planning your next line. Ask a relevant question, avoid interrupting, and let the exchange develop naturally. The aim is not to look perfect. It is to make the other person feel respected. Also remember that “professional” or “confident” does not have one universal appearance. A calm, direct introduction may work well in one setting, while a more informal approach fits another. Adapt to the situation without erasing your personality.

A quick visual checklist before a meeting

Preparation: know why you are there. Presence: put away avoidable distractions. Warmth: acknowledge the other person. Listening: respond to what they actually said. Follow-through: do what you promised after the meeting. These behaviors are more meaningful over time than trying to control every detail of your appearance.

Give people a second look

The strongest correction to snap judgment is deliberate curiosity. If someone’s first impression does not match what you later observe, update your view. If you feel you made a poor first impression, remember that later behavior can add context. A sincere apology, thoughtful follow-up, or consistent reliability can matter much more than an awkward opening. Relationships are built through repeated interactions, not a single snapshot.

The takeaway

First impressions are real psychological events, but they are not reliable biographies. You can prepare, show consideration, and communicate clearly without pretending to be someone else. Offer others the same room to be understood that you would want for yourself.

The digital version of a first impression

First meetings now happen through profile photos, video calls, messages, and professional pages as often as they happen in person. Online, people may notice the clarity of a profile, the tone of a message, the way someone introduces their work, or whether their communication feels consistent. But digital cues are especially easy to misread: a delayed reply may mean someone is busy, not dismissive; a short message may reflect communication style, not hostility. When the relationship matters, ask rather than assume.

How to recover from an awkward opening

Most people have moments when a name slips away, a joke lands badly, or nerves make them talk too quickly. The best response is usually simple. Acknowledge the moment briefly, correct what needs correcting, and return attention to the conversation. Overexplaining can make a small stumble feel larger than it is. If you interrupted someone, invite them to finish. If you misunderstood, ask a clarifying question. A first impression can be revised through respectful behavior.

A useful distinction: likability is not the same as trust

A person can seem friendly in a short interaction without having demonstrated reliability. Trust develops through repeated actions: keeping commitments, respecting boundaries, being honest when something goes wrong, and treating people consistently. Likewise, a reserved first impression does not mean someone is unkind or incapable. Give important decisions more evidence than a smile, a handshake, or a polished introduction.

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Sources and further reading

• Princeton University: First impressions after a 100-millisecond exposure
• American Psychological Association: Thin slices of life
• Columbia Business School: Accuracy of first impressions

Keep exploring The Immortal Content

• Why Your Brain Remembers Embarrassing Moments More Than Good Ones
• 25 Conversation Starters That Go Beyond Small Talk
• Why Some People Are More Productive at Night

The bottom line

First impressions are quick, but they are not a complete measure of another person. Appearance, tone, context and expectations can shape an early judgment before much information is available. Give people room to show who they are over time, and be aware of how your own assumptions influence what you notice.

First impressions are fast, but they are not a complete measure of another person. Appearance, tone, context and expectations can shape an early judgment before much information is available. Give people room to show who they are over time, and notice how your own assumptions influence what you see.