Religion & Law

A person's moral judgments can be changed almost instantly by delivering a magnetic pulse to an area of the brain near the right ear, according to a study in the Proceedings of the National Academy of Sciences.  People in the study read stories designed to produce moral judgments. One such story begins with a woman named Grace putting powder in her friend's coffee. After that, the story can go in several different directions.  In one version, Grace believes she's putting sugar in her friend's coffee. But it turns out to be poison and her friend dies. In another version, Grace believes she's putting poison in the coffee but it turns out to be sugar and her friend is fine.  People who hear these stories generally forgive Grace for unwittingly poisoning her friend, says Liane Young, a researcher in the Department of Brain and Cognitive Sciences at the Massachusetts Institute of Technology. And, she says, they usually condemn Grace for the failed attempt to do harm.

Young and her colleagues used a technique called transcranial magnetic stimulation, or TMS, to temporarily decrease activity in an area of the brain called the right temporoparietal junction. It's near the surface of the brain, above and behind the right ear, and it seems to helps us decipher another person's beliefs.  Twenty volunteers got TMS before or during the time they were listening to stories like the one about Grace and the coffee. The stimulation caused people to pay less attention to Grace's intention and more attention to the outcome, Young says.  "If no harm was done, then subjects would judge [Grace's behavior] as OK," she says, even if the story made it clear Grace was trying to poison her friend. That's the sort of moral judgment you often see in kids who are 3 or 4 years old, Young says.

"Moral judgment is just a brain process," [Harvard psychologist Joshua Greene] says. "That's precisely why it's possible for these researchers to influence it using electromagnetic pulses on the surface of the brain." . . . If something as complex as morality has a mechanical explanation, Green says, it will be hard to argue that people have, or need, a soul.