Answer:
decentering
Explanation:
Based on the information provided within the question this child is demonstrating an understanding of decentering. This term refers to the ability that a child may have of visualizing all the aspects regarding a specific situation. This ability is usually seen in children ages 7-12 and shows that the child has an increased ability of logic use. Which is what the child in this situation is demonstrating by being able to determine that both cups had the same amount of liquid after all the steps of the process have been completed.
It was considered an idiopathic disorder