In a New Yorker piece last month, Jonah Lehrer wrote about the neuroscience of choking under pressure:
Choking is actually triggered by a specific mental mistake: thinking too much. The sequence of events typically goes like this: When people get anxious about performing, they naturally become particularly self-conscious; they begin scrutinizing actions that are best performed on autopilot. The expert golfer, for instance, begins contemplating the details of his swing, making sure that the elbows are tucked and his weight is properly shifted. This kind of deliberation can be lethal for a performer. …There is something poignant about [the] deconstruction of choking. It suggests that the reason some performers fall apart on the back nine or at the free-throw line is because they care too much. They really want to win, and so they get unravelled by the pressure of the moment. The simple pleasures of the game have vanished; the fear of losing is what remains.