麻豆社

Over the last half a century, American psychologist Walter Mischel has been following the subjects of his ground-breaking study of delayed gratification known as the Marshmallow Test. He tells Quentin Cooper that childhood 'high delayers' achieved greater academic success and better relationships later in life but also that just about everybody can improve their self-control. With Mitu Khandaker-Kokoris and Lesley Fellows. (Photo: Getty Images)