Final answer:
Overimitation is commonly seen among 2- to 6-year-olds, where they imitate all aspects of adult behavior, even those that are irrelevant and inefficient.
Step-by-step explanation:
The phenomenon common among 2- to 6-year-olds where they imitate adult actions that are irrelevant and inefficient is known as overimitation. This is a stage where children have not fully developed the ability to distinguish necessary actions from unnecessary ones in behavioral sequences, leading them to mimic all aspects of adult behavior, even those that are not logical or required. It differs from concepts like egocentrism, where children are unable to see things from perspectives other than their own, or animism, where they might believe that inanimate objects have living characteristics. Overimitation demonstrates children's propensity to learn from older figures by copying them, even when the actions do not make sense.