| A | B |
| Jean Piaget | psychologist who study cognitive development |
| cognitive development | the ways in which thinking and reasoning grow & change |
| sensorimotor stage | the stage in which word symbols are tied to movements & names of objects |
| object permanence | term for awareness that specific objects are real & part of world |
| preoperational stage | stage in which child is very self-involved |
| reversibility | term for hte idea that relationships go both ways |
| conservation | term for the idea that some object's characteristics change change while others stay the same |
| concrete operational stage | stage in which the child understands there is a real world with real objects |
| formal operational stage | stage in which abillity to deal with highly symbolic thoughts appear |
| assimilation | process of acquiring new information about worlkd & fitting it into what already knows |
| accommodation | process of creating a new concept to handle new information |