Final answer:
During middle childhood, cognitive growth enables children to develop more complex concepts of themselves.
Step-by-step explanation:
The cognitive growth that takes place during middle childhood enables children to develop more complex concepts of themselves. During middle childhood (ages 6-11), children's thought processes become more logical and organized when dealing with concrete information. They develop the ability to understand concepts such as past, present, and future, and can plan and work towards goals. This cognitive development allows children to have a more advanced understanding of themselves and their place in the world.