Cognitive dissonance
The discomfort of holding two conflicting cognitions, especially a gap between what you did and what you believe about yourself, and the mental moves that reduce it. People usually change the belief to fit the act, not the reverse.
What drives it
Protects a consistent, favourable self-image ('I am decent and competent'). When behaviour threatens that image, the story is adjusted so the self survives intact.
How it shows
Work
The executive who fought for an acquisition becomes its most loyal defender as it fails. Managers who fired someone come to remember them as worse than they were. People who came through a brutal hiring process or initiation defend it. Someone who signed off on a dubious number begins to believe it was defensible.
Relationships
After treating someone badly, people tend to run them down: 'she had it coming'. Those who gave up a lot for a relationship hold on harder. Doing someone a favour makes you like them more (the Ben Franklin effect).
Self
Irritation, defensiveness or a sudden urge to explain when someone points out an inconsistency. Watch for your opinion of a person dropping right after you have wronged them; that is the mind making the act fit.
What tells it apart
Rationalisation: Rationalisation produces excuses the person may half-know are excuses; dissonance reduction includes genuine attitude change, so the person does not merely justify the act but comes to believe in it.
Sunk cost fallacy: Sunk cost is a decision to keep investing because of past spend; dissonance shows as changed liking or belief, a person who now truly values what they paid for, not one who just keeps paying.
Ambivalence: Ambivalence holds both sides openly and can say so ('I love him and he exhausts me'); dissonance is uncomfortable and gets resolved, usually by quietly dropping one side.
A test
Track how a person's evaluation of someone or something moves after they commit to it or harm it; a shift that follows their own actions rather than new information is dissonance reduction.
Questions to carry
- What changed in how they talked about someone after they had already let that person down?
- After I did something that didn't fit who I think I am, what story did I start telling about it?
How strong the research is
moderate. The broad effect is well supported, but a 2024 multi-lab replication of the classic induced-compliance paradigm (Vaidis and colleagues) did not find the predicted attitude change, so the strength of specific paradigms is in question.
Where it comes from
Leon Festinger, 1957; Leon Festinger and James Carlsmith, 1959; Elliot Aronson, 1960s (self-concept version)
Sources
- Leon Festinger, A Theory of Cognitive Dissonance (1957)
- Elliot Aronson (later editions with Joshua Aronson), The Social Animal (1972)