The swiss psychologist jean piaget is best known for his: influential theory of psychosocial development throughout the life span. theory proposing that children progress through distinct stages of cognitive development. extensive studies of how parenting styles influence the social behavior of children and adolescents. information-processing theory of social development.

The theory was proposing that children progress through different  stages of cognitive development

Explanation:

Jean Piaget was a Swiss psychologist. He was a famous psychologist worked on child development. In his theory, he describes how children construct their mental model about the world. He never agreed with the concept that intelligence is fixed traits. He focused on the cognitive development of the children that occurs due to the combination of biological and environmental factors. He was the first psychologist who studied a systematic way of development of the children.

answer; i believe the correct answer is prefrontal cortex;