Can First Impressions Change — The Moments a Face Judgment Gets Updated

0.1 Seconds of Certainty — But Certainty Does Not Equal Accuracy

When we meet an unfamiliar face, we reach a conclusion before we even think. Whether this is someone trustworthy, an easy pushover, or somehow appealing. Because this judgment arrives on its own without effort, we often call it intuition or a gut feeling, and it feels that much more like truth. But a fast, confident judgment is not the same as an accurate one. Confidence comes not from the amount of information but from the smoothness of processing. This article does not cover how to erase a first impression or how to craft a good one. Quite the opposite. Following psychology research, it looks at how easily the sense of having fully read a person from a single face is shaken, and what actually updates that first judgment. Whether physiognomy or first impressions, here we treat them not as tools for pinning people down but purely as a culture-and-psychology story about how we look at faces. We do not claim that personality or destiny can be fixed from a face.

Same Face, Different Photo — The Premise Todorov and Porter Shook

If a first impression were a fixed signal engraved in the face, photos of the same person should give a similar impression whenever they are taken. The 2014 study 'Misleading First Impressions' by Alexander Todorov and Jenny Porter shook this premise head-on. The researchers showed people several photos of one individual and had them rate impressions such as trustworthiness, attractiveness, and competence. The result was unexpected. The differences in impression among photos of the same person were as large as the differences between different people — and sometimes larger. A single photo with slightly different lighting and a subtly shifted expression swapped out the whole impression we believed to be this person's face. A face that looked trustworthy being read as cold in another shot was closer to a common rule than an exception.

So what a first impression read was likely not the person's essence but a single image that happened to catch our eye at that moment. If you were certain someone was reliable or aloof from one profile photo, the thing you reacted to may have been not the person but the angle and light of that shot. On dating apps, in resume ID photos, on the company intranet profile — a large share of the judgments we make every day rests on such chance. The fact that the raw material of a first impression is this unstable quietly tells us why pinning people down on that basis is so precarious.

Why Do We Trust Faces So Quickly — A Shared Illusion

So why do we hold so firmly to such an unstable signal? In his 2017 book 'Face Value,' Todorov separates out two properties of facial impressions. One is consensus. People agree with one another to a surprising degree about which faces feel trustworthy. The other is validity. Yet when you ask whether that agreed-upon impression actually predicts real personality or behavior, the evidence grows sharply thin. It is often simply the case that many people misread the same face in the same way. Todorov locates the reason in overgeneralization. We read an expressionless face that slightly resembles an angry one as aggressive, and we read youthful features as naive. In effect, we overextend an ability honed to read fleeting emotions and apply it to appearance, which is not emotion. Draping a halo of good character over an attractive face, or linking the round, large eyes of a baby face with honesty, are branches of the same overgeneralization. A shared illusion feels like fact because many people share it, but a shared misreading does not thereby become truth.

Why Is the First Judgment So Persistent

The problem is that this first judgment is unusually persistent. It is no accident that the subtitle of 'Face Value' is the irresistible influence of first impressions. A facial impression forms in less than a second, and once it settles in, it rarely gives way. Well-known psychological habits pile on here. The primacy effect, in which information that arrives first sets the interpretive frame for what follows, and confirmation bias, in which only evidence matching our first conclusion catches our eye. We forgive the slip of a face we judged trustworthy as a one-off, while we chew over the same slip from a face we somehow found untrustworthy, telling ourselves we knew it all along. In this way a first impression edits the world in the direction of proving itself. But persistent and correct are entirely different words.

Beyond the First Impression — Behavior and Morality

Fortunately, the first impression is not the last. A 2013 study conducted together by Peter Mende-Siedlecki, Sean G. Baron, and Todorov examined how people rewrite the first judgment made from a face using later behavioral information. What is interesting is that this updating is not symmetric. In the domain of morality, a single negative act — say, information that someone betrayed another or lied — pulls the impression sharply down. In the domain of ability, by contrast, a single outstanding achievement pulls the impression sharply up. The researchers explain the asymmetry through diagnostic value. Our brains assume that, when gauging morality, a bad act tells us more, while when gauging ability, an excellent performance tells us more. Everyone has had the experience of an evaluation collapsing in an instant for someone whose first impression was good but who repeatedly broke promises — and, conversely, of completely re-seeing a colleague who seemed indifferent after watching them quietly take responsibility in a crisis. What overturned the judgment in that moment was not the face but the behavior.

The point is clear. The first impression a face gives quietly cedes its place to what the person actually did. However kind an impression may look, it collapses before one plain betrayal, and however brusque a face may seem, it is redrawn before steady diligence. An impression is less a sentence carved in stone than a draft that keeps being rewritten. And the pen revising that draft is held not by the face but by time and behavior.

The More You Trust the Face, the More You're Wrong — The Cost of Overconfidence

Yet people often trust the face more than the behavior. The 2010 study 'Fooled by First Impressions?' by Christopher Olivola and Todorov measured exactly this cost of overconfidence. The researchers analyzed data in which people guessed traits such as age or disposition from unfamiliar faces alone, and the accuracy of face-based guesses was disappointingly low. Under some conditions, guessing by base rates with no information at all was actually more accurate. The more striking result was the tendency for people who relied more heavily on facial cues to become more inaccurate in their predictions. A face gives us a strong feeling that we know, but the size of that feeling and the actual hit rate do not move together. Sometimes the paradox holds that the less you look at the face, the less you are wrong. Why does such overconfidence arise? Because a face is an immediate, tangible cue, it is cognitively very attractive. Learning a person's real disposition takes the effort of time and observation, but the face is right here in front of us now. We tend to quietly swap a hard question for an easy one, and a prime example is replacing the hard question of whether that person is trustworthy with the easy one of whether that face looks trustworthy.

So What Actually Changes the First Judgment

So what actually moves the first judgment? Pulling the preceding studies together, three things come to mind. The first is the person themselves, not the photo. When we meet the same face repeatedly across many scenes and expressions, the impression made by a single snapshot gradually blurs toward an average. The second is individuating information. As concrete facts accumulate — a name, a manner of speaking, things experienced together — the crude cue of the face recedes. This is exactly what social psychology has long emphasized: individuating, concrete information about a person is counted among the strongest forces for pushing back the stereotype the face summoned. The third is context. Depending on where and in what relationship we met, the same expression is read differently. Here it becomes clear why this article does not drift into how to make a good first impression. The lesson the research offers is not to manipulate impressions to your advantage, but rather that the first judgment is so provisional and replaceable that you should not fix it too early. What needs changing is not the other person's face but the speed inside us that turns a face straight into a conclusion.

So, Can First Impressions Change

So, can first impressions change? The research's answer is that they can, and more importantly, that the very attitude of knowing they can change is itself a kind of maturity. On this site I treat physiognomy and first impressions not as fortune-telling that pins people down, but as a culture-and-psychology text that has us look back on how we read faces. This article does not claim that personality, destiny, or ability can be read from a face, and still less does it recommend judging an actual person by such reading. A first impression is not settled information but the start of a question. If we can ask why did I read that face that way, we have already stepped one pace outside the first judgment. And that one step becomes a path toward being a little more generous — both to the person sitting across from us and to our own face in the mirror. The most mature use of physiognomy-for-fun probably lies in enjoying that single step.