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Formal Operational Stage

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Concrete Operational Stage

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Preoperational Stage

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Sensorimotor Stage (object permanence)

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Don't have object permanence (out of sight, out of mind)

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Schema: mental mold into which we pour our experiences
Maturation: an orderly sequence of generically designed biological growth processes
Assimilation: incorporating new experiences into our current understanding
Accommodation: the process of adjusting a schema and modifying it

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You have a sense of self and an increased long-term memory.

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90% of US babies walk by 15 months.

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25% of all babies in the US walk by 11 months.

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Thinking, memory, and language develop. Fiber pathways supporting language and agility proliferate into puberty. Shuts down excess connection.
80% of American teens are fine with how things are now, 20% aren’t

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The brains neural network sprouts most rapidly in the frontal lobes, which enable rational planning.

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The developing brain cortex overproduces neurons, with the number peaking at 28 weeks. It subsides to a stable 23 billion at birth.