At what age do infants begin to coordinate physical sensations with schemas, according to Piaget's sensorimotor stage?

Infants begin to coordinate physical sensations with schemas during the 1-4 months age range, which aligns with Piaget's concept of the sensorimotor stage, specifically the substage known as primary circular reactions. During this period, infants start to focus on their own body and the effects of their actions, such as discovering that sucking their thumb or kicking their legs produces interesting effects. This exploration leads to the development of repetitive actions that are associated with the pleasurable sensations they produce, demonstrating the early formation of schemas—mental structures that help organize and interpret information.

At this stage, infants are moving beyond simple reflexive actions to intentional behavior, actively engaging with their environment through trial and error. This foundational development is critical as it lays the groundwork for further cognitive growth, allowing the child to create more complex and varied schemas. As they progress, they will refine their understanding of their surroundings and begin to interact with objects and people in more advanced ways.