In this Hidden Brain episode, psychologist Abigail Marsh shares her research on altruism, sparked by two life-changing experiences: being rescued by a stranger on a highway and rushing to help her injured child. Through her studies of kidney donors who give to strangers, Marsh reveals how brain structure—specifically, a larger and more active amygdala—correlates with extraordinary altruistic behavior and the ability to recognize fear in others.
The episode explores how altruistic individuals often view their actions as obvious choices rather than heroic deeds, and explains that courage involves acting despite fear, not the absence of it. Marsh discusses humans' capacity for helping strangers, how altruistic behaviors like blood donation become normalized over time, and practical ways people can cultivate altruism through everyday actions in their communities.
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Psychologist Abigail Marsh's research into altruism stems from two life-changing experiences. The first occurred when a stranger risked his life to save her from a dangerous highway situation, crossing six lanes to help her disabled car. The second involved her own instinctive rush to help her injured child on a ski slope. These experiences sparked her curiosity about what drives people to help others, especially when there's nothing to gain and everything to lose.
Through her research, Marsh discovered that altruistic kidney donors, who give organs to strangers, show unique traits. They possess larger and more active amygdalas—about 8% larger than average—making them better at recognizing others' fear. These individuals often treat strangers like family and typically view their extraordinary acts as simple, obvious choices that anyone would make.
Contrary to popular belief, heroic rescuers experience intense fear during their acts of courage. Marsh points to examples like Cory Booker, who admitted feeling terrified while saving a neighbor from a burning building, and kidney donors who overcome medical fears to help others. She suggests that true courage isn't about being fearless but about acting despite fear.
Shankar Vedantam and Marsh discuss humans' inherent capacity for altruism, noting our unique tendency to care for unrelated young. Marsh observes that altruistic behaviors like blood donation have become normalized over time, and that increased well-being in societies tends to boost altruistic behavior.
Marsh emphasizes that cultivating altruism starts with everyday acts of helping. She suggests focusing on local needs and opportunities, noting that taking modest risks and facing fears can build the courage needed for altruistic actions. Whether it's helping through local charities or aiding strangers, she maintains that individual actions matter in fostering a culture of altruism.
1-Page Summary
Through harrowing experiences on a freeway and a ski slope, psychologist Abigail Marsh has delved deep into why people perform altruistic acts, particularly for strangers. Her research into selflessness is directly rooted in these moments of high stakes and unexpected kindnesses.
One night on I-5 South from Seattle, Abigail Marsh faced a life-threatening situation. She swerved to avoid a dog and ended up spinning her car, which came to a halt in the fast lane facing oncoming traffic. To her surprise and relief, a stranger risked his own life to help her. Crossing six lanes of highway in the middle of the night, he reached Abby's immobilized vehicle. Once there, he waited for a gap in traffic, ran to the driver's side, corrected the issue with the car being in drive, got it started, and then quickly drove them to safety.
Marsh's life was saved thanks to the bold actions of a stranger. As she sat in her car, unable to move with vehicles whizzing past, this person chose to act, risking his life multiple times. Abby would later look back on the stranger's spontaneous courage and wonder what could have moved him to such a daring rescue.
This incident had a profound impact on Marsh. It left her in shock, flooded with gratitude, and filled with regret for not being able to thank the man or learn his name. However, this life-changing event did more than stir her emotions; it sparked a relentless curiosity about the psychological forces driving altruistic behavior. Why would someone risk their life for a stranger?
Abigail Marsh didn't just walk away from this experience with her life; she walked toward a career that seeks to answer the questions her incident presented. She became a psychologist with a particular interest in what pushes individuals to help one another, especially when there's nothing to be gained and everything to lose.
Marsh compares her ...
Personal Experiences That Inspire Research on Altruism
Extraordinary altruists, such as altruistic kidney donors, exhibit unique psychological and neurobiological traits that differentiate them from the general population, as studied by researchers like Abigail Marsh.
Altruistic kidney donors, sometimes referred to as non-directed kidney donors, give their kidneys to anonymous strangers, often with little concern for the recipient's identity or the outcome. They display an unusual pattern on social discounting tasks, that is, they show a willingness to sacrifice as much for strangers as most people would for distant friends or acquaintances.
Altruistic people are relatively better at recognizing other people’s fear, with increased amygdala activation in response to fearful images. Their amygdalas are also larger—on average about 8% larger than those in a control group. This increased size and activity in the amygdala are key for detecting others' fear and anxiety.
Altruistic kidney donors, like Harold Mintz, treat people they have never met as if they have a close social connection, essentially valoring strangers similarly to how they would value family or friends.
Despite their extraordinary actions, altruists often regard their actions as something not special, reflecting a mindset that what they do is the simple and clear decision when presented with the opportunity to help.
The Psychology and Neuroscience of Extraordinary Altruists
Understanding that fear plays a significant role in altruistic actions challenges the often misrepresented "superhero" narrative and highlights the human aspect of courage.
Despite depictions as fearless saviors, real-life rescuers experience fear like anyone else, and their acts of courage can mean overcoming intense personal dread.
As mayor of Newark, New Jersey in 2012, Cory Booker faced the challenge of feeling fear while undertaking a rescue from a burning building. Booker impulsively ran into the smoke-filled house to save his neighbor's daughter, against the pleas from his security detail, and suffered injuries including smoke inhalation and second-degree burns. Despite the media depiction of him as a superhero without fear, Booker admitted to feeling terrified during the ordeal.
The same emotion is faced by individuals like altruistic kidney donors who often have deep-seated fears, such as a phobia of needles. Nonetheless, their concern for others motivates them to overcome such fears, highlighting that courage is not the absence of fear, but action in spite of it.
Embracing fears and choosing to act altruistically despite them demonstrates true courage, which can grow through exposure to risks and challenges.
Emotion, Especially Fear, In Altruistic Behavior
Shankar Vedantam and Abigail Marsh discuss the inherent altruistic nature of humans and how it manifests in various behaviors that illustrate a capacity for greater kindness and selflessness.
Vedantam suggests that humans possess an innate capacity for care that extends beyond their own offspring. This tendency can be linked to the potential for escalating altruism through expanding the circle of care, or alloparenting, which involves caring for infants who are not one's own. Alloparenting is a behavior not commonly observed in many primate species but is prevalent in humans and is speculated to be a foundation for the high levels of altruism seen in our species.
Marsh illustrates that human altruism is not limited to caring for unrelated infants but also extends to actions such as blood and organ donation. Over time, blood donation, once regarded as extraordinary, has become commonplace. Marsh shares optimism that other forms of altruism, like organ donation, could similarly become more accepted and normal ...
The Potential for Greater Altruism in Human Nature
Abby Marsh encourages individuals to engage in altruistic behaviors and outlines ways to overcome barriers that may prevent people from acting on their altruistic impulses.
Marsh asserts that everyday life is replete with examples of people helping each other, a reality often overshadowed by the media's focus on the worst human behaviors. She suggests that our personal experiences commonly involve interactions with genuinely nice individuals.
Marsh points out that becoming more altruistic starts with performing altruistic acts, regardless of size, and that altruism can be cultivated through everyday acts of helping. She recommends focusing on needs and opportunities within one's local environment, noting that when recruiting for research, people exhibit altruism by their readiness to help. Positive acts like helping a baby blue jay embody altruistic impulses, proving that despite the potential cost of time and effort, helping can be rewarding.
Taking examples from the Florida beachgoers forming a human chain to the general increase in altruistic behavior during the COVID-19 pandemic, Marsh suggests that attending to immediate crises or voluntary actions can foster a culture of altruism. She advises looking around for help needed in one's physical world, whether it's through local charities or aiding strangers, encouraging the notio ...
Overcoming Barriers to Altruistic Action
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