Swiss developmental psychologist who developed the most influential theory of cognitive development — four stages from sensorimotor to formal operations — and founded genetic epistemology.
Stages of cognitive development: sensorimotor (0-2), pre-operational (2-7), concrete operational (7-12), formal operational (12+). Assimilation and accommodation: cognitive development occurs through incorporating new information into existing schemas (assimilation) and revising schemas (accommodation). Constructivism: children construct knowledge through active engagement with the world — not passive reception. Object permanence, conservation, egocentrism.
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