In another study, by the music psychologist Gary McPherson, children were asked a simple question before they started their first music lesson: 'How long do you think you will play your new instrument?' The options were: through this year, through primary school, through high school, or throughout life. On the basis of their answers, McPherson categorized the children (again in secret) into three groups, showing short-term commitment, medium-term commitment, and long-term commitment. He then measured the amount of practice by each child per week and came up with three more categories: low (20 minutes per week), medium (45 minutes per week), and high (90 minutes per week). When he plotted the children's actual performance on a graph, the differences between the three groups were astonishing. Not only did the long-term committed perform better with a low level of practice than the short-term committed with a high level of practice (presumably forced by their parents!) - the long-term committed performed 400 per cent better than the short-term committed when they, too, adopted a high level of practice.