How do Festinger and Carlsmith (1959) determine the level of cognitive dissonance experienced by participants in their classic peg-turning study?

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Festinger and Carlsmith determined the level of cognitive dissonance experienced by participants in their classic peg-turning study by assessing their attitudes regarding how fun the experimental peg-turning task was. Participants who were paid $1 to lie about how enjoyable the task was experienced increased cognitive dissonance because they had to reconcile the fact that they had lied for a small amount of money with the fact that the task was actually boring. Those who were paid $20 did not experience as much cognitive dissonance because they had a larger external justification for their lie.

How Do Festinger and Carlsmith (1959) Determine the Level of Cognitive