The authors of your text present a study by Egan and his colleagues in which monkeys were given a choice between different colours of M&Ms.Later their preference for different colours of M&Ms was re-assesseD)The researchers found that

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The study by Egan and colleagues demonstrated that monkeys exhibited post-decision dissonance, a psychological phenomenon where individuals justify their choices by increasing their preference for the selected option and decreasing their preference for the rejected ones.

The Authors of Your Text Present a Study by Egan