When we make decisions, we’re not always in charge. We can be too impulsive or too deliberate for our own good; one moment we hotheadedly let our emotions get the better of us, and the next we’re paralyzed by uncertainty. Then we’ll pull a brilliant decision out of thin air—and wonder how we did it. Though we may have no idea how decision making happens, neuroscientists peering into our brains are beginning to get the picture. What they’re finding may not be what you want to hear, but it’s worth your while to listen.

A version of this article appeared in the January 2006 issue of Harvard Business Review.