Final answer:
Jean likely specializes in developmental psychology, which focuses on physical, cognitive, and psychosocial development throughout the human lifespan.
Step-by-step explanation:
Jean is a psychologist who studies the changes that take place in people over the course of their lifespan. Jean most likely specializes in developmental psychology. Developmental psychology is the branch of psychology that studies physical, cognitive, and psychosocial development across a person's life. Jean Piaget, a notable figure in this field, focused particularly on the role of social interactions in child development and the development of cognitive abilities from infancy to adulthood.
Developmental psychologists aim to understand the growth and changes that individuals undergo from conception through childhood, adolescence, adulthood, and death. They work within three developmental domains: physical, cognitive, and psychosocial. Physical development includes changes in the body and brain, senses, motor skills, and health. Cognitive development encompasses learning, attention, memory, language, thinking, reasoning, and creativity, while psychosocial development involves emotions, personality, and social relationships.