Piaget's cognitive development

Jean Piaget was a developmental psychologist in the early half of the nineteenth century. He was famous because of his work with children and figuring out how their brains worked. He believed that a child's brain is different from an adult's brain, and that there are stages that the brain has to go through developmentally to be considered totally matured. One of the reasons that our brain needs to go through developmental stages because humans …

…as they go throughout the cognitive stages their brain comprehends more and more and is then better equipped to think abstractly. Everyone matures at a different rate so that the ages for these stages are an approximation that is fairly close. A very important fact is that since not every child reaches each stage at the same age, and some may never progress from a certain stage depending on their environment and their mental capabilities