Janie is a 3-month-old infant participating in an experiment. she's lying in her crib with one end of a ribbon tied to her foot and the other end tied to a mobile dangling over her crib. she quickly learns that she controls the movement of the mobile with her kicking. one week later, the researchers return, tie the ribbon to her foot and hang the mobile above her crib. immediately, janie starts vigorously kicking her leg. what does this experiment demonstrate?

Three-month-olds can remember things for at least a week.

Explanation:

As you can see from the text shown in the question above, Jamie (a three-month-old baby) participated in an experiment where he could understand that he could control the movement of an object through the movement of his foot. A week later the researchers realized that Jamie remembers that by moving his foot he can control the movement of the object, which means that three-month-olds can remember things for at least a week.