The document discusses several theories related to learner development:
1. Sigmund Freud emphasized that personality consists of the id (pleasure-centered), ego (reality-centered), and superego (conscience). He also believed people progress through 5 psychosexual development stages from oral to genital.
2. Jean Piaget's theory of cognitive development consists of 4 stages from sensorimotor to formal operations based on how children understand and interact with the world.
3. Lev Vygotsky emphasized that social learning and culture influence cognitive development and the zone of proximal development, which is the distance between what learners can do independently vs. with guidance.