It’s Not What You Do, it’s What I Expect: The Role of Perceivers’ Predictions in Shaping Social Perception
Using representational similarity analysis and linear mixed models across two independent samples, this study demonstrates that perceivers' prior predictions are the most influential factor in shaping social judgments of trustworthiness and likeability, exerting a stronger impact than facial attributes, emotional expressions, or contextual scenarios.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Every day, we make split-second decisions about the people we meet. A stranger's smile might make us feel safe, while a furrowed brow could trigger a warning signal. For decades, scientists believed these snap judgments were driven almost entirely by what we see on a person's face: their gender, their expression, or the immediate situation they are in. We assumed our brains acted like cameras, simply recording these visual facts and converting them into feelings of trust or distrust. But a new line of thinking suggests that our brains are not passive recorders. Instead, they are active forecasters, constantly guessing what will happen next based on our past experiences and beliefs. If this is true, then who a person is might matter less than what we expect them to be.
This idea sits at the heart of a recent study conducted by researchers from universities in Germany, Spain, and Hungary. They wanted to settle a debate: when we judge someone, do we rely more on the physical reality of their face and surroundings, or on our own internal predictions? To find out, they designed an experiment that tested how people evaluate strangers when those strangers either match or violate our expectations. The researchers recruited two groups of university students, one in Germany and one in Spain, to ensure their findings were not just a fluke of a single culture. In the lab, these students watched short stories unfold on a screen. Each story described a situation that would naturally make someone feel happy, sad, or afraid. After reading the scenario, the students saw a photo of a person reacting to that situation. Sometimes the person's face matched the story—a smile in a happy story, a frown in a sad one. Other times, the reaction was completely out of place, like a smile during a frightening event.
Before the main task, the researchers asked the students to predict how they thought people would react in these situations. This step was crucial because it allowed the scientists to measure exactly what each individual student expected to see. The students then rated how trustworthy and how likable they found the person in the photo. The results were striking. As expected, people generally rated women as more trustworthy than men, and they preferred faces that matched the emotional context of the story. However, the most powerful factor was not the face itself, nor the story, nor even the gender of the person. It was the student's own prediction. When a person's reaction aligned with what the student had anticipated, that person was judged as significantly more trustworthy and likable. When the reaction violated the prediction, the judgment dropped, regardless of how the face looked or what the story said.
To understand the depth of this effect, the researchers used a sophisticated method called representational similarity analysis. Imagine trying to map how a person's brain organizes information. The researchers built a map of the students' ratings and compared it to maps of the different factors they had manipulated: the gender of the person, the type of story, the facial expression, and the student's own prediction. They found that the map of the students' ratings looked most like the map of their own predictions. In other words, the structure of their social judgments was shaped more by what they thought would happen than by the actual visual details in front of them. The physical features of the face and the context of the story still mattered, but their influence was secondary to the power of expectation.
This study challenges the long-held view that social perception is a simple reaction to external stimuli. It suggests that our brains construct social reality by testing our predictions against the world around us. When the world matches our forecast, we feel a sense of safety and connection. When it does not, we feel a sense of unease or distrust. The researchers found that this mechanism is robust, appearing consistently across two different countries and cultures. While the study focused on university students and specific emotional scenarios, the findings hint that our biases and prejudices might not just be about who we see, but about what we expect to see. If our brains are constantly predicting the future, then changing our expectations might be the key to changing how we judge the people we meet.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.