| |
| | Development, Child - MSN Encarta |
 | | Based on his studies and observations, Piaget theorized that children proceed through four distinct stages of cognitive development: the sensorimotor stage, the preoperational stage, the concrete-operational stage, and the formal-operational stage. |
 | | During the sensorimotor stage, which lasts from birth to about age 2, understanding is based on immediate sensory experience and actions. |
 | | Another significant achievement of the germinal stage is implantation of the cell mass, now called the blastocyst, into the inner wall of the mother’s uterus, where it will remain for the duration of prenatal development. |
| encarta.msn.com /encyclopedia_761557692_3____13/Development_Child.html (1814 words) |
|