"givers always score high on other-interest, but they vary in self-interest. There are two types of givers, and they have dramatically different success rates. Selfless givers are people with high other-interest and low self-interest. They give their time and energy without regard for their own needs, and they pay a price for it. Selfless giving is a form of pathological altruism, which is defined by researcher Barbara Oakley as "an unhealthy focus on others to the detriment of one's own needs," such that in the process of trying to help others, givers end up harming themselves."