Final answer:
The fourth substage of the sensorimotor stage is the coordination of secondary schemes, which occurs between 8 and 12 months of age. Infants develop intentionalactions and begin to actively explore their environment, coordinating more complex actions that involve manipulating objects or using tools.
Step-by-step explanation:
The fourth substage of the sensorimotor stage is the coordination of secondary schemes.
This substage occurs between 8 and 12 months of age.
During this substage, infants develop intentional actions and begin to actively explore their environment.
They coordinate their secondary schemes, which are more complex actions that involve manipulating objects or using tools. For example, a baby may use a stick to reach for a toy that is out of reach.
This substage represents a significant milestone in the development of infants' understanding of cause and effect relationships, as well as their ability to plan and execute goal-directed actions.