In this Hidden Brain episode, psychologists Jay Van Bavel and Dominic Packer examine how group identities affect human behavior and social connections. Through examples ranging from national identity to sports team allegiance, they explain how group affiliations shape our perceptions, influence our judgments, and affect our relationships with others. Their research shows that even randomly assigned groups can trigger strong feelings of loyalty and hostility.
The discussion explores how these tribal instincts manifest in modern contexts, from consumer preferences to political divisions that affect family relationships. Van Bavel and Packer also address how shared challenges can unite people across existing divides, using examples from sports teams to national crises, and examine how leaders can use group dynamics to foster unity in divided communities.

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Psychologists Jay Van Bavel and Dominic Packer explore how group identities profoundly impact social connections and behavior. Van Bavel illustrates this through the example of Canadians abroad finding instant camaraderie through shared national symbols, like the maple leaf flag. This connection extends to consumer behavior, where group identities can influence preferences - for instance, when Canadian identity is activated, people show stronger preference for culturally significant products like maple syrup.
Our group affiliations significantly influence how we perceive and interpret the world around us. Research from the University of Sussex demonstrates this effect through a study where participants rated identical odors as more offensive when they believed they came from outgroup members. In sports, this bias manifests in how fans interpret controversial moments, like the disputed 1966 World Cup goal between England and Germany, where each side's perception aligned with their team's interests.
Henri Tajfel's research reveals how even randomly assigned groups can trigger in-group favoritism and out-group hostility. Van Bavel explains that this tendency appears in every studied culture, with modern political divisions exemplifying these tribal instincts. These divisions have become so pronounced that they affect personal relationships, with research showing political disagreements shortening family gatherings and influencing dating preferences.
Van Bavel and Packer demonstrate how shared adversity can unite people across existing divides. Their own relationship, which began with tension over gym equipment, was strengthened through shared challenges. This principle extends to larger scales - from sports teams building bridges across community divisions to the unifying effect of national crises. Leaders can harness these dynamics, as demonstrated by Mandela's strategic use of rugby to foster unity in post-apartheid South Africa.
1-Page Summary
Group identities have a profound impact on social connections and preferences, affecting everything from brand loyalty to personal interactions. Psychologists Jay Van Bavel and Dominic Packer delve into how these collective identities can bind strangers and inform behaviors and choices.
Van Bavel highlights the social fabric that is woven through shared identities, allowing for instant camaraderie in new environments.
Jay Van Bavel recounts an anecdote for travelers from Canada to sew the Canadian national flag onto their backpacks, an emblem that signals their identity while abroad. This practice aids in forging instant connections with fellow Canadians. Van Bavel himself experienced this kinship during his first international trip to Venice in high school, when he was approached by another Canadian, drawn by the Canadian maple leaf on his sweater.
Subtle reminders of our group affiliations can steer our preferences and even purchasing decisions.
In a revealing study in Ottawa, Van Bavel observed that when participants' Canadian identity was made salient, they exhibited a stronger preference for maple syrup over honey during a taste test. This inclination showcases that activating a specific identity can make associated symbols and products more appealing, given maple syrup's strong connection to Canadian culture.
Van Bavel draws attention to the comm ...
The Social Bonding Power of Group Identities
Group identities have a profound impact on the way we perceive the world around us and judge various situations. Studies in different domains, from sensory experiences to sports affiliations and policing, illustrate that our alignment to particular groups biases our views.
A clear example of how group identity can influence our basic senses is a study from the University of Sussex involving odors.
Participants of this study were exposed to the smell of t-shirts worn by someone from their university, considered an in-group, versus t-shirts from a rival university, an out-group. The study found that participants rated the odor as more disgusting when they thought the t-shirt belonged to an out-group member, even though the actual smell was identical. This demonstrates how our group affiliations can even skew our olfactory perceptions to favor our in-group.
Our loyalty to the groups we identify with can also shape our perception of events and reality itself.
During the 1966 World Cup finals, a controversial goal during the England vs. Germany match sparked dispute. The English players, motivated by their allegiance and desire to win, celebrated what they saw as a goal, while the German players protested. This moment underscores how our group loyalties can lead us to interpret events in a way that favors our side, sometimes in contradiction with the evidence.
Additionally, studies at Yankee Stadium have shown that Yankees fans made distorted judgments about the distance to Fenway Park, perceiving it as much closer than it actually is, indicating that their sports allegiance can even distort spatial perceptions.
On a more societal level, research from NYU has revealed that when viewing videos portraying conflicts between police officers and suspects, viewers who identify with the police often blame the suspect, focusing on their actions. Conv ...
How Group Identities Shape Our Perceptions and Judgments
The research of Henri Tajfel and Jay Van Bavel provides insights into how group affiliations can create favoritism and hostility, even driving wedges between family members and romantic partners.
Psychological studies illustrate the tendency to favor one's own group after random assignments.
Henri Tajfel's study demonstrated how random assignment to groups, based solely on purported artistic preferences for Paul Klee or Wassily Kandinsky, could incite in-group favoritism and out-group hostility. Volunteers, falsely informed about their preferred artist, tended to allocate more money to their in-group members, even at the cost of receiving less themselves, just to maximize the difference between the groups. The participants expressed this bias despite not interacting with other group members or expecting to meet them.
Jay Van Bavel expands on this by noting that the formation of groups and coalitions is natural and has been observed in every studied culture. These groupings, regardless of how they may appear to outsiders, evoke genuine and significant feelings to members. The identification with a group rapidly alters their automatic evaluations of those within or outside these groups.
Political affiliations have morphed into something akin to sectarian conflicts, imposing moralized identities that disrupt social relationships.
According to Van Bavel, politics today, particularly in the United States, exude a polarization that can be compared to sectarian conflicts, with significant moral undertones. This ideological divide causes individuals to view those within their in-group as inherently good, while demonizing members of the out-group as evil. Consequently, people may cast their support or vote for a candidate from ...
The Divisive Effects of Group-Based Tribalism and Polarization
Finding common ground through shared identities and experiences can create strong bonds and foster cooperation. Jay Van Bavel and Dominic Packer's work delves into the psychology behind this phenomenon.
Jay and Dominic's relationship began tensely over smelly gym equipment, but they soon bonded over the adversity of a stinky office—a clear example of how shared challenges can unite people and overcome initial divides.
Van Bavel recounts a life-saving experience where he choked on a cheese cube during a reception, and Dominic, after a tense moment, performed the Heimlich maneuver, saving his life. This extreme situation cemented their bond, leading to a lasting friendship and later collaboration. Similarly, studies, such as one in northern Iraq, demonstrate that when people come together in teams for sports, even reluctant participants can grow a sense of unity, rising above their initial differences.
In more extreme situations, like hostages banding together on a hijacked plane regardless of nationality, or the way Americans came together following the 9/11 attacks, the shared identity that comes from a crisis can promote resilience and unification.
Astronauts looking at Earth from space often feel a sense of awe and connectedness with all of humanity. This suggests that promoting a sense of common humanity could motivate people to work together against shared threats, like climate change.
Coltan Scrivner points out that horror fans and those with a high morbid curiosity may be more resilient in troubling times. The shared social experience of watching scary movies can mitigate loneliness and provide pe ...
Using Identities to Promote Cohesion and Cooperation
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