There's 4 stages in Piaget's stages of development. Describe them and what are their respective age groups?

1. Sensorimotor (0-2 years) = goal-directed behaviour, object permanence. 2. Preoperational (2-7 years) = rapid increase in language ability with overgeneralised language, symbolic thought, dominated by perception. 3. Concrete operational (7-11 years) = operates logically with concrete materials, classifies and serial orders. 4. Formal operational (11- adulthood) = solves abstract and hypothetical problems, thinks combinatorially.