AP Psychology — development across the lifespan

Unit 3 of AP Psychology follows a person from before birth to late adulthood, and the category's development and learning material already covers its best-known landmarks: Piaget's conservation, Vygotsky's zone of proximal development, secure attachment and Erikson's final stage. This material covers the rest of the development topics the course framework lists, which exam questions reach just as often.

It starts with how development is studied: the enduring themes of stability and change, nature and nurture, and continuity and stages, and the difference between cross-sectional and longitudinal designs, including the cohort differences that can mislead a cross-sectional study. Physical development runs from prenatal influences such as teratogens, through infant reflexes like rooting, the visual cliff, and critical or sensitive periods, including imprinting in other animals, to puberty with its primary and secondary sex characteristics, and on to the changes of adulthood, such as menopause and slower reaction times.

Language development covers the stages found across cultures (cooing, babbling, the one-word stage and telegraphic speech) and the telling errors of overgeneralization. Social-emotional development covers parenting styles; Bronfenbrenner's ecological systems from the microsystem to the chronosystem; peer relationships, with parallel and pretend play in childhood and the imaginary audience and personal fable in adolescence; identity statuses; the social clock and emerging adulthood; and adverse childhood experiences. The written work also includes a question on how sex and gender influence socialization, the course's topic 3.3.

Four formats are offered. The quiz has twelve questions on short invented cases, each asking which concept or stage the case shows. The flashcards cover the vocabulary, including the four identity statuses and the five ecological systems. The oral exam begins with designing a study of vocabulary across adulthood and continues one question at a time through prenatal influences, language milestones, parenting and adolescent identity, ending with brief feedback. The written work is a printable sheet of eight open questions, from comparing research designs to classifying invented teenagers by identity status.

The material is based on the published AP Psychology course framework, Unit 3, topics 3.1, 3.2, 3.3, 3.5 and 3.6. The stages of prenatal development and the pragmatics of language are left out, as the framework places them outside the exam.

• Compare cross-sectional and longitudinal designs and explain cohort differences
• Explain teratogens, infant reflexes, the visual cliff, critical periods and imprinting
• Describe the physical changes of puberty and adulthood
• Identify the stages of language development and overgeneralization
• Apply parenting styles, ecological systems, adolescent egocentrism and identity statuses to cases

Practice material written by Zestly, based on the College Board AP Psychology Course and Exam Description (effective fall 2024, with the October 2025 clarifications), Unit 3, topics 3.1 Themes and Methods in Developmental Psychology, 3.2 Physical Development Across the Lifespan, 3.3 Gender and Sexual Orientation, 3.5 Communication and Language Development and 3.6 Social-Emotional Development Across the Lifespan. All cases are invented.