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1.Use of simple logic
2.Use of simple mental manipulation
3.Conservation- the principle that matter does not increase or decrease because of a change in form.

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When the cant first think for themselves, and does not think logically and behavior that's predicted.

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Object Permanence- the understanding that objects continue to come and go, and thinks things are really gone but they're really not
Egocentrisim- limited ability to comprehend a situation from a perspective one has not experienced.
Animism- tendency to attribute life ot inanimate things.

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Cognitive Stages of Development: Sensorimotor Stage- Cognitive structures or schema are how humans acquire and apply knowledge about their world.
Assimilation- use of available cognitive structures to gain new info.
Accommodation-process of modifying cognitive structures in the face of newly realized complexities in the environment.

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Rooting- when touched on the cheek, a baby will turn his or her head to side it was touched to put an object in its mouth.
Sucking- when an object is placed in the baby's mouth, the infant will suck on it.
Moro- when startled, a baby will fling their limbs out and retract them.
Babinski- when a baby's foot is stroked, he or she will spread their toes.
Grasping- If an object is placed into a baby's palm or foot pad, the baby will try to grasp it.

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Teratogens -disease agents, drugs, and other environmental agents that can cause birth defects during the prenatal period.