The ModernEncyclopedia Est. 2026 · A living curriculum · Regularly updated
PSY-19 · Social Sciences · Fully written

Learn Psychology with any AI

The science of mind & behaviour

Psychology is the science of mind and behaviour — how we perceive, remember, feel, decide and relate to one another. It sits between biology and the social sciences, and it is messier, and more contested, than its textbook confidence sometimes suggests.

Learned honestly, it's as much about how to run and read a study as about the findings themselves — because a striking number of famous results turned out to be shakier than they looked. Set your level below.

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PSY-19 · Psychology
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§02

A map of Psychology

Mind and behaviour, many angles

The field's main branches.

  • Biological psychology — the brain and nervous system behind behaviour.
  • Cognitive psychology — memory, attention, language and reasoning.
  • Developmental psychology — how minds change across a lifetime.
  • Social psychology — how others shape what we think and do.
  • Individual differences — personality, intelligence and what makes us differ.
  • Research methods & statistics — the backbone that decides what to believe.
  • Applied fields — clinical, educational, forensic and beyond.
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The canon

The figures and the famous studies

Real people and real experiments — several now seen more critically.

  • Wilhelm Wundt — opened the first psychology lab in 1879, making it a science.
  • William James — The Principles of Psychology, the field's first great synthesis.
  • Sigmund Freud — psychoanalysis: hugely influential, and hugely contested as science.
  • Pavlov & B.F. Skinner — conditioning and behaviourism.
  • Jean Piaget — the stages of children's cognitive development.
  • The classic social studies — Milgram on obedience, Asch on conformity, and Zimbardo's Stanford Prison experiment (now heavily criticised on method and ethics).
  • Kahneman & Tversky — the systematic biases in human judgement.
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The live debates

An unusually self-critical field

Psychology's most important debates are about its own reliability.

  • The replication crisis. Many celebrated findings don't reproduce — the single most important thing to understand about modern psychology.
  • Nature vs nurture. The joint shaping of behaviour by genes and environment.
  • Is psychology a science? How far a rigorous science of something as slippery as the mind is possible.
  • The ethics of the classics. Studies that couldn't be run today, and what they really showed.
  • WEIRD samples. Much research used Western, educated participants — so how universal are the findings?
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Where to start

A route in

A route in — everything runs from the panel above.

  1. Run Orientation on cognitive or social psychology.
  2. Use Great Debates on the replication crisis — read the famous studies with a sceptical eye.
  3. Learn to judge a study: ask the tutor how you'd know whether a finding is real.
  4. Read a good intro textbook alongside Kahneman's Thinking, Fast and Slow.

Treat every striking result as a question: does it replicate?