What is the primary difference between infant abilities during the fourth and fifth substages of the sensorimotor period?

Question

Quizplus · Accepted Answer

During the fifth substage of the sensorimotor period, infants begin to experiment with new behavior to see what effects those actions have, thus deliberately varying their behavior to create new schemes. This experimentation is a key difference from the fourth substage, where actions are more repetitive and focused on achieving outcomes that the infant has previously experienced.

What Is the Primary Difference Between Infant Abilities During the Fourth