Baby Lucy is 8 months old. She picks up a toy in her crib and accidentally hits her crib with the toy, making an interesting noise. She begins to drag the toy back and forth against the sides of the...

Baby Lucy is 8 months old. She picks up a toy in her crib and accidentally hits her crib with the toy, making an interesting noise. She begins to drag the toy back and forth against the sides of the crib's railing, which produces another different and interesting sound. This prompts Lucy to continue repeating the action over and over again. Piaget would say that this is an example of