sensorimotor- infancy- six substages- motor activity
preoperational- 2 sub stages- intelligence and memory develop- shown in symbols- non logical thinking- toddlers and young children
concrete operational- systematic and logical method through symbols- primary school to early adolescence
formal operational- logical series of symbols, not easily understood concepts- formal education- 35% of all people- adolescence to adulthood- hypothetical and deductive reasoning- abstract concepts
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