The Art of Virtual Persuasion , Science

Excerpts: For example, a week before the 2004 U.S. presidential election,
Jeremy Bailenson and colleagues at Stanford University asked 240 volunteers to
fill out surveys regarding the two main candidates, President George W. Bush
and Senator John Kerry, while viewing side-by-side photographs of the two men.
For a randomly selected third of the subjects, the researchers used software to
merge Bush's photo with a photo of the subject, making Bush look more like the
subject without the subject noticing.

The Art of Virtual Persuasion, Greg Miller, 07/09/07, DOI:
10.1126/science.317.5843.1343, Science: Vol. 317. no. 5843, p. 1343