Why do people do good? A new scientific study suggests that it's not just for an emotional reward: people may actually act selflessly because they're acutely tuned into the needs and actions of others. For decades, psychologists and neuroscientists have puzzled over the tendency of humans to engage in altruistic acts -- defined as acts "that intentionally benefit another organism, incur no direct personal benefit, and sometimes bear a personal cost." The bottom line, says Duke University professor Scott Huettel, is that altruism may rely on a basic understanding that others have motivations and actions that may be similar to our own. "It's not exactly empathy," he says, but something more primitive.
