Psychology
Developmental Psychology
This guide helps you get your bearings in Developmental Psychology before you start exploring the interactive timeline, framework graph, and concept maps.
Before You Dive In
- Developmental psychology studies how people change across the entire lifespan — not just childhood, though that remains the most researched period.
- The field is organized around stage theories (Piaget, Erikson, Kohlberg) that propose universal, sequential progressions — but cross-cultural research has complicated the universality claims.
- Start with Piaget's theory of cognitive development — even where it's been revised, his questions and methods shaped the entire field.
- Nature vs. nurture is the field's oldest debate, but modern developmental science treats the question as "how do genes and environments interact?" rather than picking sides.
- Attachment theory (Bowlby, Ainsworth) bridges developmental and clinical psychology and remains one of the most empirically supported frameworks.
Key Terms to Know
Cognitive stagesPiaget's four stages (sensorimotor, preoperational, concrete operational, formal operational) describing qualitative shifts in how children think.
AttachmentThe emotional bond between infant and caregiver; secure attachment predicts better social and emotional outcomes (Bowlby, Ainsworth).
Zone of proximal developmentThe gap between what a learner can do alone and what they can do with guidance — a key concept from Vygotsky.
Critical periodA time window during which specific experiences are necessary for normal development (e.g. language acquisition).
Psychosocial stagesErikson's eight stages of identity development across the lifespan, each defined by a central conflict (e.g. trust vs. mistrust).
Common Confusions
Thinking developmental psychology is only about children — lifespan development includes adolescence, adulthood, and aging.
Assuming Piaget's stages are fixed and universal — neo-Piagetian research shows more variability and domain-specificity than originally proposed.
Conflating "critical period" with "sensitive period" — critical periods have hard cutoffs, while sensitive periods are windows of heightened (but not exclusive) plasticity.
Recommended Reading
The Origins of Intelligence in Children— Jean Piaget
1952Attachment and Loss, Vol. 1: Attachment— John Bowlby
1969Child Development— Laura E. Berk
2017How to Use the Interactive View
1
Explore the timeline
Open the interactive view and scan the framework timeline. Which frameworks came first? Which ones overlap? Where are the big transitions?
2
Read the articles
Click into individual frameworks to read what each one claims, where it came from, and how it relates to its neighbors.
3
Check the concept map
See how the key ideas within a framework connect. This is useful for figuring out what to learn first and what depends on what.
4
Test yourself
Take the quiz for any framework you've read about. It's a quick way to find out whether you actually understood the core ideas or just skimmed them.