SOLITUDE is out of fashion. Our companies, our schools and our culture are in thrall to an idea I call the New Groupthink, which holds that creativity and achievement come from an oddly gregarious place. Most of us now work in teams, in offices without walls, for managers who prize people skills above all. Lone geniuses are out. Collaboration is in.

But there’s a problem with this view. Research strongly suggests that people are more creative when they enjoy privacy and freedom from interruption. And the most spectacularly creative people in many fields are often introverted, according to studies by the psychologists Mihaly Csikszentmihalyi and Gregory Feist. They’re extroverted enough to exchange and advance ideas, but see themselves as independent and individualistic. They’re not joiners by nature.

One explanation for these findings is that introverts are comfortable working alone — and solitude is a catalyst to innovation. As the influential psychologist Hans Eysenck observed, introversion fosters creativity by “concentrating the mind on the tasks in hand, and preventing the dissipation of energy on social and sexual matters unrelated to work.” In other words, a person sitting quietly under a tree in the backyard, while everyone else is clinking glasses on the patio, is more likely to have an apple land on his head. (Newton was one of the world’s great introverts: William Wordsworth described him as “A mind for ever/ Voyaging through strange seas of Thought, alone.”)

Solitude has long been associated with creativity and transcendence. “Without great solitude, no serious work is possible,” Picasso said. A central narrative of many religions is the seeker — Moses, Jesus, Buddha — who goes off by himself and brings profound insights back to the community.