In your own words, what did Jean Piaget think about a child's cognitive development?

1. sensorimotor stage
1. when?
2. how?
3. toy example:
4. object permanence=
2. preoperational stage
1. when?
2. milk example:
3. conservation=
4. stuffed dog example:
5. egocentric=
6. brother example of egocentricism:
7. theory of mind=
3. concrete operational stage
1. when?
2. put it in your own words:
3. an example:
4. formal operational stage
1. when?
2. put it in your own words:
3. an example: