From the page: "The introvert advantage isn't only about avoiding trouble--for yourself or the global financial system. Florida State University psychologist K. Anders Ericsson believes that deliberate practice--training conducted in solitude, with no partner or teammate--is key to achieving transcendent skill, whether in a sport, in a vocation or with a musical instrument. In one study, Ericsson and some of his colleagues asked professors at the Music Academy in Berlin to divide violinists into three groups, ranging from those who would likely go on to professional careers to those who would become teachers instead of performers. The researchers asked the violinists to keep diaries and found that all three groups spent about the same amount of time--more than 50 hours a week--on musical activities. But the two groups whose skill levels made them likelier to play well enough to perform publicly spent most of their time practicing in solitude.
In later studies, Ericsson and his colleagues found similar results with chess grand masters, athletes and even ordinary college students studying for exams. For all these groups, solitary training allows for a level of intense and personal focus that's hard to sustain in a group setting. "You gain the most on your performance when you work alone," says Ericsson. "And the introverted temperament might make some kids more willing to make that commitment.""