Radiolab: "Morality"

Original Air Date: August 13, 2007
Hosts: Jad Abumrad & Robert Krulwich
Featured Guests: Josh Greene, Mark Hauser, Franz de Waal, Judy Smetana, Mr. Riggs

Episode Overview

This episode explores the origins, nature, and development of morality—probing whether our sense of right and wrong is hardwired or learned, how it manifests in the brain, and how it evolves from childhood to adulthood. With philosophical thought experiments, neuroscientific research, primate observations, children’s playgroups, and a look at the history of penitentiaries, "Morality" dives into the science and emotion behind justice and empathy.

Key Segments & Discussion Points

1. The Trolley Problem: Judging Moral Dilemmas with the Brain

[01:30–18:00]

• Hosts introduce two classic moral thought experiments:

  • Scenario One: A runaway trolley is heading toward five workers. You can pull a lever to divert the trolley to another track, killing one instead of five.
  • Scenario Two: Stand on a bridge; you can push a large man off to stop the trolley and save the five—but at the cost of his life.

• Results:

  • Pulling the lever: Most people say yes (9 out of 10).
  • Pushing the man: Most people say no (9 out of 10).
  • The math is the same, yet the intuition differs.

• Mark Hauser (Harvard) discusses that people’s reasoning is often inconsistent and driven by instinct rather than logic.

  “They don’t understand what drove their judgments, which were completely spontaneous and automatic and immediate.” —Mark Hauser [05:40]

• Joshua Greene (Princeton neuroscientist/philosopher)

  • Uses brain scanners to examine responses to moral dilemmas.
  • Finds pulling the lever and pushing the man activate different parts of the brain:
    • Lever: Logical, calculating regions.
    • Pushing: Emotional, aversion-driven regions.
  • Suggests the brain contains “warring tribes”—some calculate outcomes, others recoil emotionally.

  “It’s like bleacher’s morality.” —Robert Krulwich [17:00]
  “...Maybe in your brain and every brain you’ll find little warring tribes, little subgroups, one that is sort of doing a logical, sort of counting kind of thing.” —Robert Krulwich [13:50]

2. The Evolutionary Roots of Morality

[18:00–28:20]

• Josh Greene posits we inherit a basic “primate morality.”

  • Rules like “don’t push someone off a bridge” are deeply embedded.
  • Cultural morality is layered atop these instincts.

• Franz de Waal (Emory primatologist) observes chimpanzee social behaviors—

  • Chimps share food and display empathy, reinforcing that our moral roots are not uniquely human.
  • Example: Chimps dividing a blackberry branch fairly among the group.

  “If you remove the capacity for empathy from morality, the whole thing falls apart.” —Franz de Waal [27:38]

• Empathy as a foundational trait:

  • Story of Binti Jua the gorilla—who rescued a human child in distress.

  “Actually, the response of that gorilla to the boy who had fallen in was a very common, typical ape response.” —Franz de Waal [28:00]

3. The Limit of Empathy: Extreme Dilemmas

[28:20–38:30]

• Another moral scenario: Would you smother your own child to save villagers from an enemy patrol?

  • People’s brains show a “world war” between logical sacrifice and an intense, primal reflex not to harm one’s own child.

• Josh Greene’s Findings:

  • In this extreme scenario, humans engage brain regions above the eyebrows (prefrontal cortex) more than chimps ever could.
  • These regions are more developed in humans and may allow us to override primal instincts for the “greater good.”

  “Looking at these two flashes of light at the front of a human brain, you could say we are looking at what makes us special.” —Robert Krulwich [36:18]

• Audience Debate:

  • The hosts themselves disagree over what choice they’d make, showing both logical and emotional responses.

• Guilt and Shame:

  • The discussion ends noting that guilt/shame—the ability to blush, self-reflect, and be tormented by past acts—may truly distinguish humans from other animals.

4. The Moral Sense in Children: The Playgroup and the Happy Victimizer

[38:30–56:10]

• Judy Smetana (University of Rochester):

  • Children begin to develop a sense of morality as young as two.
  • By age four, kids know hitting is wrong, regardless of rules or being caught.
  • Some rules (sit for lunch) are seen as flexible; rules against hurting others are absolute.

• Playgroup Observations:

  • Kids can recite rules (“No hitting, no pushing, no banging heads”) and understand hurt feelings.
  • Despite understanding, kids may still hurt others—“the happy victimizer effect.”

  “So to hit another kid or to take another kid's toys feels good. But to have your toys taken by another kid feels bad.” —Robert Krulwich [51:22]

• Moral Reasoning:

  • Coordinating the victim’s and the transgressor’s perspectives, and using empathy, is a major developmental challenge.

• Role of Experience & Reflection:

  • Children may feel shame, regret, and, over time, internalize moral lessons—sometimes likened to “seeds in the dirt” that must grow.

5. Conscience, Guilt, and Moral Memory: The Homestead Game

[56:10–1:12:40]

• Amy O’Leary’s Story:

  • As a child, Amy led her class in exploiting a simulation game, forming a “company,” underpaying peers, and flooding the “economy” with counterfeit money.
  • No explicit punishment from the teacher, just his “quiet disappointment.”

  “It stuck with me as this lesson of, even if you’re not going to get punished for something, it still can be wrong.” —Amy O’Leary [1:10:00]

• Lasting Impact:

  • Both Amy and a classmate (Dale) share stories of childhood moral lapses that shaped them into more empathetic adults.

  “I’ll help anybody I can just because I don’t want to have that feeling again.”—Dale [1:11:30]

• Moral Development:

  • These memories of guilt, shame, and striving to “do what you know is right” play a crucial role in adulthood.

  “If people are left alone, they have a tendency to do the right thing. Kids have the tendency to do the right thing.” —Mr. Riggs [1:12:09]

6. Society, Punishment, and Prison Reform

[1:13:10–1:21:30]

• Eastern State Penitentiary (Philadelphia):
  • The hope: solitary isolation would make criminals genuinely penitent.
  • Over time, sensory deprivation was found to cause mental breakdown, not moral reflection.
  • Symbolizes society’s optimism (or naivety) about the ease of “fixing” morality.

  “Walls were built with the idea that people are inherently good. And by the end, they were housing all these inmates who apparently they had assumed were inherently evil.” —Sean Kelley [1:20:30]

Notable Quotes

• On Explaining Intuition:

  “They don’t understand what drove their judgments, which were completely spontaneous and automatic and immediate.”
  —Mark Hauser [05:40]

• On Human Evolution and Morality:

  “...It’s probably better to say that it was handed up from below, that our most basic core moral values are not the things that we humans have invented, but the things that we’ve actually inherited from other people.”
  —Robert Krulwich [17:40]

• On Empathy:

  “If you remove the capacity for empathy from morality, the whole thing falls apart.”
  —Franz de Waal [27:38]

• On Guilt/Shame:

  “Guilt. The ability to blush. That’s the one expression that the apes don’t have, as far as I know… I’m not sure that they are particularly well-developed in the chimpanzee.”
  —Robert Krulwich [37:45]

• On Conscience:

  “It stuck with me as this lesson of—even if you’re not going to get punished for something, it still can be wrong, because then it was successful. If that has happened.”
  —Amy O’Leary [1:10:00]

Important Timestamps

• Trolley Problem Introduced: [02:20]
• Mark Hauser on Universality of Reactions: [05:40]
• Josh Greene on Brain Scans: [12:50]
• Franz de Waal's Chimpanzee Empathy: [22:30]
• Brookfield Zoo Gorilla Rescue Story: [28:00]
• Extreme Moral Dilemma (Smothering Baby): [32:20]
• Brain Areas Unique to Humans: [36:18]
• Children's Moral Understanding (Smetana): [39:45]
• Rules Recited by Playgroup Kids: [48:20]
• “Happy Victimizer” Effect: [51:22]
• Amy O'Leary's Homestead Game Story: [56:10–1:12:40]
• Eastern State Penitentiary Segment: [1:13:10–1:21:30]

Episode Tone & Style

The hosts maintain a curious, investigative tone, blending philosophical depth and scientific inquiry with playful banter and real-life stories. Empathy and reflection run through the episode, with moments of humor, vulnerability, and deep ethical questioning.

Summary: Takeaways for Listeners

• Moral intuition is both ancient and complex—sometimes logical, sometimes deeply emotional.
• Evidence from primates suggests core elements like empathy predate humanity.
• Brain science reveals competing voices in our heads: logic wrestles with instinct.
• Children’s morality is surprisingly robust—and still developing—as early as age two to four.
• Personal and societal experiences of guilt and shame shape lifelong morality.
• Philosophical puzzles, biology, culture, and environment all contribute to our sense of right and wrong.

In short: Morality is as much a tug-of-war in our brains and societies now as it’s ever been—a dynamic, evolving, and fundamental part of being human.