To make the statement true, change "theories regarding changes in emotional ability" to "theories regarding changes in cognitive ability" or "theories of cognitive development." Jean Piaget is famous primarily for his theories about cognitive development, describing how children's thinking evolves through distinct stages from infancy to adulthood

. While he acknowledged emotional development, his main contribution lies in explaining how intellectual and cognitive processes change qualitatively over time, not specifically emotional abilities

. So a corrected version could be: "Jean Piaget is famous for his theories regarding changes in cognitive ability that occur as we move from infancy to adulthood."