The authors of your text present a study by Egan and his colleagues in which monkeys were given a choice between different colors of M&Ms-later,their preference for different colors 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, meaning they showed a preference for the colors they had previously chosen, indicating a cognitive bias similar to that seen in humans.

The Authors of Your Text Present a Study by Egan