Several years ago, changes in advertising restrictions allowed pharmaceutical companies to begin promoting their products through traditional media. today, it is common to see ads on television ending with, "ask your doctor about [our medicine]." in addition to creating awareness about their drugs, the companies are most likely hoping to promote public interest social responsibility communications. reduce deceptive advertising. offer objective-and-task marketing communications. stimulate interest, persuading consumers to investigate further. signal encoding symbols to simplify the feedback loop.