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IB DP Psychology — Concepts: Perspective | SL & HL | Paper 1
🎯 Learning Intentions By the end of this note, you will be able to:
- Define the biological, cognitive, and sociocultural approaches using IB-aligned terminology.
- Explain the core assumptions of each approach and how they differ in their explanations of human behaviour.
- Describe the role of biological, cognitive, and sociocultural factors in shaping thought, emotion, and behaviour.
- Evaluate research evidence for each approach using supporting and opposing studies in ACAS format.
- Apply each approach to a real-world case study, identifying which factors each perspective would emphasise.
- Discuss the strengths and limitations of each approach as an explanation of human behaviour.
- Analyse the three approaches using relevant concept areas: Perspective, Bias, Causality, and Responsibility.
- Compare the three approaches, identifying points of overlap and tension between them.
Introduction & Context
Imagine two students sitting the same exam. One freezes with anxiety, their heart racing, their mind going blank. The other feels calm, methodically working through each question. A third student, who studied in a noisy household with little encouragement, gives up halfway through. Why do people respond so differently to the same situation? Is it something in their brain chemistry? Is it the way they think about the exam? Or is it the environment they grew up in?
Psychology does not offer a single, unified answer to questions like this. Instead, it approaches human behaviour through multiple lenses — each one illuminating a different layer of the same phenomenon. These lenses are called approaches or perspectives , and in IB Psychology, three are central: the biological approach, the cognitive approach, and the sociocultural approach. Understanding what each approach assumes, what kinds of evidence it draws on, and where it falls short is one of the most important foundations of the entire course.
🔍 Analogy — Three Doctors, One Patient Imagine a patient who is exhausted, unmotivated, and struggling to concentrate. A neurologist examines their brain chemistry and hormone levels. A cognitive therapist explores their thought patterns and beliefs about themselves. A sociologist asks about their work environment, relationships, and cultural pressures. Each professional is looking at the same person but through a completely different lens. None of them is wrong — they are each capturing a real part of the picture. The three approaches in psychology work in exactly the same way.
Core Concepts
Before exploring each approach individually, it is worth pausing on what the word "approach" actually means in psychology. An approach is not simply a topic — it is a set of underlying assumptions about what causes human behaviour. These assumptions determine what questions psychologists ask, what methods they use to answer those questions, and what kinds of explanations they find convincing. Recognising the assumptions behind each approach is the key to understanding why psychologists sometimes reach very different conclusions about the same behaviour.
The first approach begins with the body. Long before psychology existed as a formal discipline, philosophers and physicians noticed that damage to the brain changed personality, that certain traits seemed to run in families, and that chemicals could alter mood and perception. These observations pointed toward a powerful idea: that human behaviour is rooted in biology.
📖 Key Definition — The Biological Approach The biological approach in psychology holds that human behaviour, thought, and emotion can be explained by