Ed Yong at “The Atlantic” writes:
You’ve likely seen the video before: a stream of kids, confronted with a single, alluring marshmallow. If they can resist eating it for 15 minutes, they’ll get two. Some do. Others cave almost immediately.
This “Marshmallow Test,” first conducted in the 1960s, perfectly illustrates the ongoing war between impulsivity and self-control. The kids have to tamp down their immediate desires and focus on long-term goals—an ability that correlates with their later health, wealth, and academic success, and that is supposedly controlled by the front part of the brain. But a new study by Alexander Soutschekat the University of Zurich suggests that self-control is also influenced by another brain region—and one that casts this ability in a different light.
Press your right index finger to the top of your right ear, where it meets your head. Now move up an inch and back an inch. You’re now pointing at your right temporoparietal junction (rTPJ). This area has long been linked to empathy and selflessness. But Soutschek, by using magnetic fields to briefly shut down the rTPJ, has shown that it’s also involved in self-control… If the rTPJ is bigger, people are more likely to behave altruistically. If the neurons within it are better-connected (and well-linked to other parts of the brain), people show less bias towards their own in-groups. If the area is stimulated by electric currents, people become better at taking someone else’s perspective. And if the region is disrupted, it changes our ability to reason about morality…
Empathy depends on your ability to overcome your own perspective, appreciate someone else’s, and step into their shoes. Self-control is essentially the same skill, except that those other shoes belong to your future self—a removed and hypothetical entity who might as well be a different person. So think of self-control as a kind of temporal selflessness. It’s Present You taking a hit to help out Future You.