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The internal discomfort of holding conflicting opinions.
Featured in 14 UX Bites
Similar psychology:
You could reduce churn by creating an early moment of commitment, so quitting later creates cognitive dissonance with the promise users made to themselves.
Users may use commitment features less, e.g., subscriptions, even if they'd benefit, because signing up triggers cognitive dissonance with how they see themselves.
It's possible users break unwanted habits more easily when made to see their own actions, as the cognitive dissonance becomes harder to ignore.
Pressure mechanics like streaks may increase frustration, as missing a day creates cognitive dissonance between users' actions and how disciplined they feel.
Reducing cognitive dissonance, e.g., by letting users opt out of guilt-inducing mechanics, could make your product feel more enjoyable to use.
Research answers may become less reliable, as users exaggerate intended behaviour to avoid the cognitive dissonance of admitting it clashes with their self-image.