피아제의 인지 발달 1단계

Piaget's sensorimotor stage spans from birth to approximately two years of age. During this period, infants learn about the world by linking sensory input with motor actions, such as placing objects in their mouths or shaking them to produce sounds. This stage represents the foundation of cognitive development as infants actively explore their environment through direct physical interaction.

Infants explore objects primarily through sensory-motor coordination by using their senses and developing motor skills. They mouth objects to determine texture and edibility, and as their grasping ability improves, they shake, bang, or drop objects to observe cause-and-effect relationships like sounds. This active exploration enables infants to understand their environment and gradually build cognitive awareness through direct interaction.

Object permanence is the understanding that objects continue to exist even when they are not directly seen, heard, or touched. Infants under five months typically assume objects cease to exist once out of sight. However, between five and eight months, infants begin developing object permanence, a major cognitive milestone. They demonstrate this by searching for hidden objects, reflecting their emerging ability to mentally represent objects beyond immediate visibility.

Stranger anxiety emerges around five to eight months because infants cannot yet assimilate unfamiliar people into their established mental schemas. When confronted with an unfamiliar person, infants experience fear or discomfort, expressing it through crying, clinging to caregivers, or turning away. This response signifies growing cognitive differentiation between familiar and unfamiliar stimuli, a crucial aspect of early socioemotional development during infancy.

Schemas are mental frameworks infants use to organize and understand experiences. When infants encounter a stranger, they cannot assimilate this unfamiliar person into their existing schemas of familiar people like parents or caregivers. This cognitive mismatch creates distress, triggering stranger anxiety responses. As infants develop more flexible schemas through continued exposure and cognitive growth, they gradually accommodate new experiences and reduce anxiety around unfamiliar individuals.

Cause-and-effect understanding develops as infants experiment with objects through shaking, banging, and dropping them to observe resulting sounds or movements. This experimentation helps infants recognize that their actions produce specific outcomes, building foundational knowledge about how objects interact within their environment. This emerging understanding of cause-and-effect relationships supports the development of more complex cognitive abilities as infants progress through piaget s theory of cognitive development from childhood into adulthood.

During the sensorimotor stage, infants learn by combining sensory perception with motor responses in coordinated ways. For example, they use their sense of touch and sight while grasping objects, or use hearing and motor control when shaking items to produce sounds. This sensory-motor coordination allows infants to gradually understand basic physical properties and predict how objects behave, forming the cognitive foundation for later developmental stages.