from the works presented by Edward Thorndike. Jean Piaget Jean Piaget is known for his theory of cognitive development that describes how children create a mental model of the world around them. His theory is important because it is one of the first theories that disagreed with the idea that intelligence was a steadfast trait. His theory sees cognitive development as something that happens because of biological maturation and one's interaction with their surrounding environment. Piaget did not want to measure a child's knowledge, like an I.Q. score, instead he focused on how children did with fundamental concepts. Piaget's theory has four stages. The sensorimotor stage which is birth to 18–24 months. The preoperational stage is toddler ages (18–24 months) to early childhood, age 7. The concrete operational stage, ages 7 to 12. Then the formal operation stage which is adolescence to adulthood. Before Piaget's theory it was believed that children were just less competent thinkers but this theory and his stages helped to show that children think in significantly differently ways than adults do. Lev Vygotsky Lev Vygotsky is best known for his theory in cognitive development known as social development theory. Vygotsky was developing his theories of cognitive development around the same time that Jean Piaget was developing his theories. Vygotsky believed that social interaction plays a critical role in cognitive development. He places a large emphasis on culture and how it affects cognitive development. He also sees the importance of adults in cognitive development in children. Vygotsky says that development cannot be understood without referring back to the social and also the cultural context in which it is embedded. Vygotsky claimed that learning occurs via skillful interaction in which the child is with someone who models behaviors or gives instructions for the child to follow, most likely a parent or a teacher. The child tries to understand the instructions or actions provided and then stores the information so they can use it to guide their future performances. Piaget's theory says that a child's development must follow their learning, Vygotsky disagreed with this. He believed that social learning tends to come before development. Psychology of learning theories Learning theories are attempts to better understand and explain learning processes. There are several different theories that account for learning. Neuroscience The neuroscience of learning focuses on the relationships among the central nervous system, learning, and behavior. This central nervous system