the first stage in Piaget's theory, during which the child relies heavily on innate motor responses to stimuli

SCENARIO: according to Vygotsky, your teacher could be considered the ....

the awareness that things continue to exist even when not perceived

the principle that properties such as mass, volume, and number remain the same despite changes in the forms of objects

a fertilized egg

SCENARIO: Nakai breaks a cookie into two uneven pieces and gives the smaller one to Ayla. She doesn't get that it is an unequal portion because she lacks...

the third of Piaget's stages, when a child understands conversation but still is incapable of abstract thought

In Piaget's theory, the preoperational child's difficulty taking another's point of view.

SCENARIO: if a child is playing peekaboo, according to Piaget, they lack _____

the second stage in Piaget's theory, marked by well-developed mental representation and the use of language

in Piaget's theory, the stage of cognitive development during which people begin to think logically about abstract concepts