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IB DP Psychology — Cognitive Approach | SL & HL | Paper 1
🎯 Learning Intentions By the end of this note, you will be able to:
- Define System 1 and System 2 thinking using IB-aligned terminology from Dual Processing Theory.
- Explain how the two systems interact and the conditions under which each system dominates decision-making.
- Describe the role of cognitive heuristics and cognitive biases as products of System 1 processing.
- Evaluate research evidence for Dual Processing Theory using supporting and opposing studies in ACAS format.
- Apply Dual Processing Theory concepts to a real-world case study from the cognitive perspective.
- Discuss the extent to which Dual Processing Theory provides a complete explanation of human decision-making and judgment.
- Analyse Dual Processing Theory using relevant concept areas: Bias, Causality, Measurement, and Perspective.
Introduction & Context
Imagine you are walking down a familiar street when a car suddenly swerves towards you. You do not pause to weigh up your options — you jump back onto the pavement instantly, without conscious deliberation. Now consider a different scenario: you are sitting an important exam and must choose between two complex arguments for your essay. This time, you slow down, re-read the question, and carefully construct your reasoning before committing to an answer. These two experiences feel fundamentally different, and that difference is not accidental — it reflects something deeply important about how the human mind operates.
Psychologists have long noticed that human thinking seems to operate on two distinct levels: one that is fast, automatic, and effortless, and another that is slow, deliberate, and effortful. This observation forms the foundation of one of the most influential frameworks in cognitive psychology — Dual Processing Theory. Rather than treating the mind as a single, unified reasoning machine, this theory proposes that two qualitatively different systems run in parallel, each suited to different kinds of cognitive demands. Understanding how these systems work — and when they fail — helps explain a remarkable range of everyday behaviours, from snap judgments to careful planning.
🔍 Analogy — The Autopilot and the Pilot Think of your mind as an aircraft with two modes of operation. Most of the time, the autopilot (System 1) handles routine tasks — maintaining altitude, following a familiar route — without the pilot needing to intervene. The autopilot is fast, efficient, and largely invisible. But when the weather turns unpredictable or an unusual decision must be made, the pilot (System 2) takes manual control, carefully analysing instruments and thinking through each action. The autopilot is not inferior — it handles most situations brilliantly — but it can be fooled by unusual conditions in ways the manual pilot would not be. Dual Processing Theory describes exactly this division of cognitive labour.
Core Concepts
When psychologists began studying decision-making in the latter half of the twentieth century, they noticed something puzzling: people consistently made errors in reasoning that should have been easy to avoid. Even highly educated individuals fell for predictable logical traps. The explanation, researchers came to argue, was not that people were irrational — it was that they were using a different kind of reasoning than formal logic demands. This insight led to the formalisation of what we now call System 1 thinking.
📖 Key Definition —