Who proposed a four-stage theory of cognitive development, including assimilation and accommodation?

• A. Sigmund Freud
• B. Jean Piaget
• C. Erik Erikson
• D. Lev Vygotsky

Answer: (B)

Understanding how children actively adapt their thinking through assimilation and accommodation within a four-stage cognitive development framework is what this item is about. Jean Piaget proposed this theory, outlining how thinking moves through four distinct stages: sensorimotor, preoperational, concrete operational, and formal operational. Assimilation is when a child fits new information into existing mental schemes, like a toddler calling all four-legged animals “dog.” Accommodation is when the child changes those schemes in response to new information, such as learning that a whale isn’t a dog or that a mold of a leaf isn’t the same as a real leaf. This combination of adapting thinking and progressing through stages is central to Piaget’s view of how cognition develops. Other theorists—Freud with psychosexual stages, Erikson with psychosocial stages, and Vygotsky with sociocultural theory—describe different forces and processes in development and do not present the same four-stage progression with assimilation and accommodation.