Object Permanence:The understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed. This is a key concept developed during the sensorimotor stage.
Preoperational Stage:The second stage in Piaget's theory of cognitive development (from about 2 - 7 years old), where children begin to engage in symbolic play and learn to manipulate symbols.
Reflexes:Automatic responses or actions programmed by non-cortical brain centers. These are crucial for survival during early infancy which falls under sensorimotor stage.