Why you think ads brainwash others but not you
We are quick to believe that media campaigns, political propaganda, and advertisements heavily influence other people. However, we consistently believe that we ourselves are largely immune to these same influences. This cognitive bias is called the third-person effect. Studies show this gap in perception can lead people to support censorship of media they believe will harm others while leaving themselves unaffected.
The Illusion of Personal Immunity
When people encounter aggressive advertising, sensationalized news, political campaign ads, or controversial entertainment, they rarely worry about their own ability to process the content rationally. Instead, they assume they possess the critical faculties required to see through manipulation, identify bias, and remain unswayed. At the same time, when asked how that exact same media impacts the public at large, the assessment shifts dramatically. Observers routinely assume that average citizens, political opponents, or younger demographics are highly susceptible to persuasion, deception, and moral harm.
In communication theory and social psychology, this systematic discrepancy is known as the third-person effect. First formulated by sociologist W. Phillips Davison in 1983, the concept describes a widespread tendency: individuals consistently estimate that mass media messages exert a greater impact on other people than on themselves. The effect is not merely an occasional misjudgment about a single advertisement; it represents a deeply ingrained perceptual habit that shapes how individuals interpret the flow of information throughout society.
Researchers separate the third-person effect into two interconnected elements: the perceptual component and the behavioral component. The perceptual component involves the cognitive gap itself—the belief that 'you' and 'I' are unaffected while 'they' are vulnerable. The behavioral component encompasses the real-world actions people take based on that perception. When individuals convince themselves that others are being misled or corrupted by media exposure, they often mobilize to regulate, restrict, or outright ban that content.