“Psychology has been at the heart of advertising since its invention, although, academically, advertising and psychology have long since gone their separate ways. For advertisers, the ability to manipulate consumer impressions and decision making has been the key to success. If product sales increase following a carefully orchestrated campaign, the persuasive tactics have evidently worked, although as with any natural experiment it is hard to establish cause and effect due to the lack of control over confounding variables” (Giles, p. 106).
Giles, D., 2003. Media Psychology. Mahwah: Lawrence Erlbaum Associates.