Picture a dinner table. Someone is halfway through a story, and you have already jumped in, finishing their sentence because you are certain where it is going. To you, it feels like enthusiasm. To the person you cut off, it reads as rudeness. In a five-minute clip from Big Think, psychologist Lisa Feldman Barrett uses exactly this moment, and her own admitted habit of interrupting, to make a claim that is deceptively simple and hard to shake: the traits we treat as fixed parts of a person, such as introvert, extrovert, dismissive, or engaged, are not properties sealed inside the skin. They are descriptions of a relationship, and they shift with the people in the room, how much sleep you got, and whether you have eaten. Barrett argues that identity is relational rather than internal, that the brain builds each moment predictively, and that the people around us have more say in who we are than we would like to admit.
Barrett starts with the kind of small social friction most people have lived through. She describes cutting people off because she is excited and already responding to what she thinks they will say. From where she sits, she is engaged. The person on the other end experiences her as rude. Her question is blunt: does that mean she is rude?
Her answer is yes, and the reasoning is the heart of the clip:
"I think it does. I'm experiencing myself as engaged. Another person is experiencing me as rude, and that's what's real. Not because their experience is more important than mine, but because it's equally important to mine." (Lisa Feldman Barrett, Big Think, 0:32–0:51)
This is not a polite shrug that everyone's feelings matter. It is a claim about where the trait lives. Neither perspective wins a contest for the truth about Barrett. Both are real accounts of one interaction, and the quality being judged, rudeness or engagement, exists only in the exchange between the two people. That is what makes the example more than a lesson in manners.
Barrett goes straight at the intuition most of us hold. She notes that in many cultures people assume a self is bounded by the skin: what is inside is you, and what is outside is not. Personality frameworks reinforce this picture. Take any personality test and you come away with a label, a kind of person you supposedly are, presented as a stable feature of the individual.
Barrett's position is that those labels are being misread:
"The characteristics or traits that we think are inherent to a person are not inherent to that person. They exist to describe that person in relation to other conditions." (Lisa Feldman Barrett, Big Think, 0:57–1:06)
She calls the broader view relational realism and draws out its logical consequence: "I am not the sole author of my identity, and I don't have the sole power over who I am." A trait is more like a reading taken under certain conditions than a permanent measurement of the thing itself. Once you accept that, the question "who are you?" starts to look badly framed. Barrett puts it plainly: it is a question that cannot be answered in general. The answerable version is narrower, who you are in a given moment.
To make the point concrete, Barrett rewrites a standard question. Ask "how extroverted are you?" and you assume the context does not matter. A better question would specify the scene. How extroverted are you with people you know, after a good night's sleep, at a dinner party? Compare that with how extroverted you are with strangers, after a good night's sleep, while hungry and hasn't eaten in a while. The answers would differ, and the difference is not noise to be averaged away. It is the phenomenon itself.
She is candid about the tension this creates. Barrett says the idea "feels inherently wrong" as a person, because it violates the subjective sense that we have enduring characteristics no matter where we are or who we are with. "But, as a scientist, it seems right," she says. The science, in her account, does not support the feeling of a constant self.
This is the part of the argument that may be most useful in practice. If your personality shifts with sleep, food, and company, then a bad afternoon is not necessarily a verdict on your character. It may be a bad afternoon, with bad inputs, in a bad room.
The mechanism Barrett offers is predictive. She asks the listener to imagine stopping time. At that frozen instant, your brain holds a set of patterns. Drawing on the statistics of your past, it begins to assemble an action plan for the next moment, and what you experience as your lived reality is the output of that plan. She calls this meaning-making, and she is emphatic that it mostly happens outside awareness.
The scope of her claim is broad. "Everything you do is an act of meaning-making," she says. Even the question "Who am I?" and the story you tell in answer are themselves acts of meaning-making. She describes this as the best scientific understanding available for how the brain works.
Barrett's term for this machinery is the perception box, and the video's description credits the framework to Elizabeth R. Koch. The phrase is worth pausing on, because it suggests a container with walls. Barrett corrects that image:
"You don't have a perception box with fixed walls. You have a momentary, fluctuating set of signals in your brain that is helping to make sense of what's happening in your body and what's happening in the world." (Lisa Feldman Barrett, Big Think, 4:05–4:24)
In this view, the box is not a fixed enclosure holding a fixed self. It is a live, changing process, closer to a weather pattern than a sealed room. The body's state and the surrounding world both feed into it. That is why hunger and sleep matter so much in her example. They are part of the signal the brain uses to predict what is happening and what to do next.
The most practical implication in the clip is also the most uncomfortable. If who we are is partly built in relation to others, then they are partly building us. Barrett states the consequence directly: "we have more responsibility for the identities of other people than we might think," and the people we interact with "have more influence over who we are in a moment than we might like."
She does not frame this as an argument for self-blame. She frames it as a lever. If you cannot fully author your identity alone, you can at least choose more deliberately who you spend time with and how you engage with them. Her own example comes from parenting. When her daughter left for college, Barrett told her to seek out the people who let her be the best version of herself, and to find the people who help her become that person.
"Seek out the people who allow you to be the best version of yourself. Find the people who help you to be that person." (Lisa Feldman Barrett, Big Think, 4:59–5:14)
Read this way, the advice reverses a common assumption. We usually treat companionship as something we pick for enjoyment, while character is something we bring with us. Barrett's model suggests the company we keep is part of the material our character is made from.
A five-minute interview cannot carry the full research program behind these claims, and it does not try to. It presents a framework and its implications rather than a set of experiments or a debate with critics. Anyone who wants to test the relational view against the research on stable personality traits will need to go further than this clip. What it offers is a clear way to hold the idea and a set of questions to ask yourself. How would you answer "how engaged are you?" if you specified the room, the hour, and your last meal? And who in your life is helping shape the person answering?
- Watch the full Big Think interview with Lisa Feldman Barrett, "Are you really who you think you are?" at https://bigthink.com/videos/are-you-really-who-you-think-you-are/
- Explore the Perception Box series hub at https://bigthink.com/perception-box/
- Take Barrett's situated question to your own life: pick one trait you think of as fixed and ask how it changes across a dinner party, a work meeting, and a tired Monday morning.
