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IB DP Psychology — Concepts | SL & HL | Paper 1
🎯 Learning Intentions By the end of this note, you will be able to:
- Define the terms psychological theory and psychological model using IB-aligned terminology.
- Explain the difference between a theory and a model, and the conditions under which each is used to explain behaviour.
- Describe the role of the three major psychological perspectives — biological, cognitive, and sociocultural — in generating theories and models of behaviour.
- Evaluate research evidence for psychological theories using supporting and opposing studies in ACAS format.
- Apply the concept of perspective to a real-world case study, explaining the same behaviour from multiple theoretical viewpoints.
- Discuss the extent to which any single psychological theory or model can provide a complete explanation of human behaviour.
- Analyse psychological theories and models using relevant concept areas: Perspective, Causality, Bias, and Measurement.
Introduction & Context
Imagine watching two people react very differently to the same stressful event — say, a public speaking task. One person freezes, their heart racing, convinced they will fail. The other feels a surge of energy and performs confidently. Both experienced the same situation, yet their responses were worlds apart. How do we begin to explain this? Do we look inside the brain, examine their past experiences, or consider the social environment they grew up in? The answer, it turns out, depends enormously on which theoretical lens you choose to look through.
Psychology is a discipline built on the attempt to explain, predict, and sometimes change human behaviour and mental processes. But because behaviour is extraordinarily complex, no single explanation has ever been sufficient. Over more than a century of scientific inquiry, psychologists have developed a rich toolkit of theories and models — structured frameworks that organise observations, generate predictions, and guide research. Understanding what these frameworks are, how they differ, and why perspective matters is foundational to everything else in IB Psychology.
🔍 Analogy — The Blind Men and the Elephant Imagine several people, each touching a different part of an elephant in complete darkness. One feels the trunk and concludes it is a snake. Another feels the leg and says it is a tree. A third feels the side and insists it is a wall. Each person is not wrong — they are accurately describing what they touched. But none of them has the complete picture. Psychological theories work similarly: each perspective captures something real and important about human behaviour, but no single theory touches the whole elephant. The skill in psychology is knowing which part each theory is describing — and recognising that the full picture requires multiple perspectives working together.
Core Concepts
Before we can evaluate any specific explanation of behaviour, we need to understand the tools psychologists use to build those explanations. When researchers observe patterns in behaviour — say, that people tend to remember emotionally charged events more vividly than neutral ones — they do not simply record the observation and move on. They attempt to organise it into a coherent framework that can explain why the pattern exists, predict when it will occur, and generate testable hypotheses. This is the work of theory-building.
📖 Key Definition — Psychological Theory A psychological theory is a well-substantiated, systematic explanation of some aspect of human behaviour or mental processes, developed through repeated observation, experimentation, and