Development Across the Lifespan discusses key concepts in developmental psychology including:
1. Lifespan developmental psychology examines changes from conception to death physically, cognitively, and psychosocially.
2. The nature vs nurture debate examines the relative influences of genetics and environment on development. Most experts believe both play a role.
3. Jean Piaget's theory of cognitive development outlined four stages from infancy to adulthood: sensorimotor, preoperational, concrete operational, and formal operational.
4. Erik Erikson described psychosocial crises that influence personality development at each stage of childhood. Attachment research also showed the importance of nurturing relationships.