Final answer:
Jean Piaget and Inhelder conducted studies on children to understand how their minds develop. Piaget proposed that children construct schemata, mental models used for interpreting information. Their work highlighted the cognitive changes that occur in children at different stages of development.
Step-by-step explanation:
Jean Piaget and Inhelder conducted studies on children to understand how their minds develop. Piaget proposed that children construct schemata, mental models used to interpret and categorize information. These schemata are adjusted through the processes of assimilation and accommodation, where children assimilate new information based on their existing knowledge and accommodate their schemata when encountering new information. Piaget's work spanned over 50 years and shed light on various cognitive changes in children at different stages of development.