Answer:
assimilation
Explanation:
Jean Piaget was a Swiss psychologist who was born on August 9, 1896 and is most notably recognized for his work on child development. According to my research on Piaget's studies, I can say that based on the information provided within the question he would most likely say that Mickey's reaction best demonstrates the concept of assimilation. This concept is defined as a cognitive process that controls how we take in new information and add that new information into our existing knowledge database.
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