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The Moral Ape
The deepest foundation on which morality is built is the phenomenon of empathy, the understanding that what hurts me would feel the same way to you. And human ego notwithstanding, it's a quality other species share.
It's not surprising that animals far less complex than we are would display a trait that's as generous of spirit as empathy, particularly if you decide there's no spirit involved in it at all. Behaviorists often reduce what we call empathy to a mercantile business known as reciprocal altruism. A favor done today—food offered, shelter given—brings a return favor tomorrow. If a colony of animals practices that give-and-take well, the group thrives.
But even in animals, there's something richer going on. One of the first and most poignant observations of empathy in nonhumans was made by Russian primatologist Nadia Kohts, who studied nonhuman cognition in the first half of the 20th century and raised a young chimpanzee in her home. When the chimp would make his way to the roof of the house, ordinary strategies for bringing him down—calling, scolding, offers of food—would rarely work. But if Kohts sat down and pretended to cry, the chimp would go to her immediately. "He runs around me as if looking for the offender," she wrote. "He tenderly takes my chin in his palm ... as if trying to understand what is happening."
You hardly have to go back to the early part of the past century to find such accounts. Even cynics went soft at the story of Binta Jua, the gorilla who in 1996 rescued a 3-year-old boy who had tumbled into her zoo enclosure, rocking him gently in her arms and carrying him to a door where trainers could enter and collect him. "The capacity of empathy is multilayered," says primatologist Frans de Waal of Emory University, author of Our Inner Ape. "We share a core with lots of animals."
While it's impossible to directly measure empathy in animals, in humans it's another matter. Hauser cites a study in which spouses or unmarried couples underwent functional magnetic resonance imaging (fMRI) as they were subjected to mild pain. They were warned before each time the painful stimulus was administered, and their brains lit up in a characteristic way signaling mild dread. They were then told that they were not going to feel the discomfort but that their partner was. Even when they couldn't see their partner, the brains of the subjects lit up precisely as if they were about to experience the pain themselves. "This is very much an 'I feel your pain' experience," says Hauser.
The brain works harder when the threat gets more complicated. A favorite scenario that morality researchers study is the trolley dilemma. You're standing near a track as an out-of-control train hurtles toward five unsuspecting people. There's a switch nearby that would let you divert the train onto a siding. Would you do it? Of course. You save five lives at no cost. Suppose a single unsuspecting man was on the siding? Now the mortality score is 5 to 1. Could you kill him to save the others? What if the innocent man was on a bridge over the trolley and you had to push him onto the track to stop the train?
Pose these dilemmas to people while they're in an fMRI, and the brain scans get messy. Using a switch to divert the train toward one person instead of five increases activity in the dorsolateral prefrontal cortex—the place where cool, utilitarian choices are made. Complicate things with the idea of pushing the innocent victim, and the medial frontal cortex—an area associated with emotion—lights up. As these two regions do battle, we may make irrational decisions. In a recent survey, 85% of subjects who were asked about the trolley scenarios said they would not push the innocent man onto the tracks—even though they knew they had just sent five people to their hypothetical death. "What's going on in our heads?" asks Joshua Greene, an assistant professor of psychology at Harvard University. "Why do we say it's O.K. to trade one life for five in one case and not others?"