Summary: Researchers tracked brain activity patterns in participants before and after they watched multiple episodes of a narrative drama. Using Representational Similarity Analysis (RSA) on functional MRI (fMRI) data, the team discovered that our neural architecture is profoundly sensitive to social friction.
Antagonistic, hostile relationships are explicitly encoded within highly specific coordinates of the cerebral cortex, whereas pleasant, friendly alliances leave a far less pronounced neural footprint under the same analytical parameters.
Key Facts
- The Drama Sandbox: To simulate how humans map natural, messy social networks, researchers had participants watch eight primary characters interact over six episodes of SUITS. This approach allowed subjects to naturally learn complex webs of legal alliances, mentorships, and fierce corporate rivalries.
- The Pre- vs. Post-Screening Catalyst: Participants underwent fMRI scans while looking at static images of the characters’ faces both before they knew anything about the plot and after they had completed the episodes. This isolated the exact changes in how the brain represents those individuals once their social standing is learned.
- Rivalries Over Friendships: When comparing participants’ post-show ratings of character relationships with their fMRI data, researchers found a stark asymmetry. Hostile, antagonistic pairings were heavily and reliably mapped by the brain, whereas friendly, affiliative relationships did not show statistically significant neural clustering under the same criteria.
- Locating the Bad Blood: The neural signatures of these rivalries were concentrated within two primary brain regions: the left anterior supramarginal gyrus (associated with processing social affect, empathy boundaries, and perspective-taking) and the right medial prefrontal cortex (the core hub for social cognition and mentalizing).
- Narrative Reality Anchors: Professor Tamami Nakano notes that when we picture a story’s character map, our attention naturally gravitates toward the conflict points. The study proves that this instinct is mirrored structurally in our biology; the brain uses social friction as a baseline coordinate system to anchor its entire social map.
- Architecting Smarter Artificial Intelligence: Beyond expanding our understanding of story comprehension and entertainment engagement, these insights offer a vital blueprint for next-generation AI systems. By teaching machine learning networks to prioritize and track adversarial tension the way a human brain does, developers can build AI that infers and navigates organic human relationships with much higher accuracy.
Source: University of Osaka
When watching a drama, we quickly learn who is friends with whom–and, just as importantly, who stands against whom. But how does the brain organize this web of alliances, rivalries, and conflicts?
Researchers from – the University of Osaka have shown that social relationships learned through a television drama are reflected in patterns of brain activity, especially when those relationships are antagonistic.
These findings will be published in Communication Psychology.
Humans need to understand not only individual people but also the relationships among them. Previous neuroscience studies have examined social networks by focusing on the number of connections or a person’s position within a group. However, real relationships are not simply “connected” or “not connected.” They also carry emotional meaning, including friendship, trust, competition, and hostility.
The research team asked 21 university students to watch six episodes of the television drama SUITS. Participants underwent fMRI scans before and after viewing the drama while looking at faces of eight main characters. After viewing, they rated all character pairs for relationship strength and whether the relationship was affiliative or antagonistic. Using representational similarity analysis, the researchers compared these ratings with brain activity patterns. They found that antagonistic relationships were strongly reflected in the left anterior supramarginal gyrus and right medial prefrontal cortex. In contrast, affiliative relationships did not show significant effects under the same criteria.
These findings suggest that the brain builds a multidimensional social map from narrative experience, and that rivalries and conflicts may serve as powerful anchors. The results could deepen understanding of story comprehension, social cognition, entertainment engagement, and future AI systems that infer human relationships.
Professor Tamami Nakano notes that “when we imagine a drama’s character map, we pay attention not only to who is close, but also to who is in conflict. This study shows that such natural social understanding is reflected in the brain.”
Key Questions Answered:
A: From an evolutionary standpoint, keeping tabs on your enemies is far more critical for survival than tracking your friends. Allies are predictable and safe, meaning they require fewer active mental resources to monitor. Rivals, competitors, and enemies represent immediate social and physical threats. Professor Tamami Nakano’s research shows that the brain acts as a security system, prioritizing social friction and using conflicts as heavy cognitive anchors to construct an accurate, highly detailed map of who poses a danger to whom.
A: Traditional brain studies use incredibly boring, artificial tests that don’t match real life. To fix this, Osaka University researchers had 21 students watch six episodes of the legal drama SUITS, which is packed with complex office politics, deep loyalties, and fierce corporate backstabbing. By scanning the students’ brains using fMRI before they knew the characters and after they watched the drama, scientists could see exactly how the brain reorganized its activity patterns to reflect the newly learned web of human alliances and rivalries.
A: Right now, artificial intelligence is great at looking at a social media network and seeing who is “connected” or “not connected” based on followers or likes. However, AI is notoriously bad at understanding the emotional nuance of human relationships. By showing that the human brain relies heavily on specific regions, like the medial prefrontal cortex, to prioritize and track adversarial conflict, this study provides a concrete blueprint for software engineers. Programmers can design AI systems that infer human social dynamics by focusing on tension and rivalries, allowing machines to understand human stories and social groups with human-like accuracy.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this neuroscience research news
Author: Saori Obayashi
Source: University of Osaka
Contact: Saori Obayashi – University of Osaka
Image: The image is credited to Tamami Nakano
Original Research: Open access.
“Antagonism Shapes Social Maps in the Human Brain” by Isato Chikazawa, Ryo Ishibashi & Tamami Nakano. Communication Psychology
DOI:10.1038/s44271-026-00491-y
Abstract
Antagonism Shapes Social Maps in the Human Brain
Human relationships form a complex web of affiliative and antagonistic ties. Yet how the brain represents their affective structures remains unclear. Here, using a television drama depicting intertwined friendships and rivalries, we examined how the brain encodes the valence of interpersonal relationships.
Participants underwent fMRI scanning before and after watching the drama while viewing the faces of its central characters. They then rated each character pair for relationship strength and valence, and whole-brain representational similarity analysis (RSA) identified brain regions representing these relational structures.
Relationship valence effects were most prominent for antagonistic (negative) relationships in the left anterior supramarginal gyrus and right medial prefrontal cortex. Univariate analyses revealed increased activation in the precuneus after drama viewing, suggesting enhanced retrieval of narrative-related person knowledge, though this region did not show statistically significant representational similarity patterns reflecting interpersonal relationships.
These findings indicate that the human brain constructs a multidimensional social map from narrative experience, with antagonistic ties playing important role in shaping social relationship representations.
