Psychological Reactance
An uncomfortable drive to resist when you feel your freedom is threatened, pushing you to reclaim what you perceive as taken away.

A motivational state of discomfort that arises when people perceive a threat to or loss of their behavioral freedom. Introduced by psychologist Jack Brehm in 1966, it describes the impulse to restore threatened freedoms. The intensity depends on how important the freedom is and how severe the perceived threat feels.
What this means in real life
A teenager is told they absolutely cannot date someone; instead of accepting the boundary, they become determined to date that person specifically to prove they can make their own choices—even if they weren't that interested before.
What it isn’t
It is not simple stubbornness or defiance for its own sake. Reactance is a specific psychological response to perceived loss of freedom, not just disagreement or rebellion. Someone can be stubborn without experiencing reactance, and reactance can occur even in people who aren't naturally rebellious.
Commonly misused online
Social media often frames reactance as 'people just being contrarian' or 'doing the opposite of what they're told.' In reality, reactance is about restoring a sense of autonomy, not simply opposing authority—the motivation is internal freedom, not external defiance.