Final answer:
Developmental psychology is the field that studies the normal changes in behavior over the lifespan, covering physical, cognitive, and psychosocial development.
Step-by-step explanation:
The psychological perspective that examines the normal changes in behavior that occur across the lifespan is called developmental psychology. This field of psychology is concerned with how people change over time, considering a range of aspects such as physical maturation, cognitive skills, moral reasoning, and social behavior.
Developmental psychology views development as a lifelong process that can be scientifically studied across various domains including physical, cognitive, and psychosocial development. Numerous theories within this perspective, such as those proposed by Freud, Erikson, Piaget, and Kohlberg, have contributed to our understanding of psychological growth across different stages of life.