Inoculation theory
A small dose of a weak counter-argument builds resistance to persuasion.
What it means
A theory of attitudinal resistance proposing that exposing people to a weakened form of an opposing argument — together with refutations — 'vaccinates' their existing attitudes against later, stronger attacks. Like a biological vaccine, the mild threat motivates people to generate their own defenses (counter-arguments and bolstering), so when the real persuasive assault arrives, they are mentally prepared to rebuff it. It works better than simply supplying supportive arguments, and is now applied to 'prebunking' misinformation before it spreads. It matters as one of the few proactive strategies for protecting beliefs against manipulation.
Examples
Showing teens a mild, refuted version of pro-smoking arguments makes them more resistant to real tobacco marketing.
Before an election, a short video shows viewers a manipulation trick — one alarming anecdote standing in for evidence — and dismantles it, so real posts using that trick land weakly.
A recruiter warns a candidate that rivals will dangle a bigger number at the last minute, and explains why; when the counter-offer arrives, it has lost much of its force.
First described in William McGuire (1961).