Sensorimotor stage (birth to two)-- Use five senses to explore and understand things2. Preoperational stage (ages two to seven)-- Use symbols to present things and feelings-- Egocentric: Children's' thoughts and communicationsare all about themselves. Children's inability to see a situationfrom another person's point of view.-- Centration: This is the tendency to focus on only oneaspect of a situation at one time.