Non-impulsive people live in a world of both space and time. They experience a past, a present, and a future. Impulsive people, at least to the extent that they are impulsive, live only in the present. Non-impulsive people use fantasy to help control both their present and their future. Impulsive people use fantasy to help control both their present and their future. Impulsive pepole are deficient in this ability. In addition, because constructive actions take more time than destructive ones, impulsive people have an inherent tendency to be aggressive, thereby eliciting aggressive responses from their environment. Impulsive people do have fantasies, but they are spatial and superficial, like cartoons. They are narcissistic, and therefore unrealistic. In children, the development of the ability to use fantasy constructively involves the anticipation of reliable gratifications, and other positive experiences with fantasy. The same considerations apply to impulsive patients in a maturational form of treatment. Their therapy needs to be a pleasurable and educational experience.