Preview
IB DP Psychology — Cognitive Approach | SL & HL | Paper 1
🎯 Learning Intentions By the end of this note, you will be able to:
- Define cognitive bias, heuristic, confirmation bias, and the availability heuristic using IB-aligned terminology.
- Explain how heuristics give rise to systematic cognitive biases in everyday thinking and decision-making.
- Describe the role of schemas and prior knowledge in shaping biased information processing.
- Evaluate research evidence for cognitive biases using supporting and opposing studies in ACAS format.
- Apply cognitive bias concepts to a real-world case study from the cognitive perspective.
- Discuss the extent to which cognitive biases provide a complete explanation of flawed human decision-making.
- Analyse cognitive bias research using relevant concept areas: Bias, Causality, Measurement, and Perspective.
Introduction & Context
Imagine you are scrolling through social media and you notice that every article you click on seems to confirm exactly what you already believed about a political issue. You might think you are simply finding the truth — but what if your mind is quietly filtering out anything that challenges your existing view? Or consider a friend who, after hearing about two plane crashes in the news, suddenly refuses to fly, even though they happily drive every day despite far higher statistical risk. These are not random quirks. They are predictable, systematic patterns in the way human minds process information.
Psychologists have long been fascinated by the gap between how rationally we think we reason and how we actually reason. Classical economic and philosophical models assumed humans were logical agents who weigh evidence carefully before making decisions. But decades of cognitive psychology research have revealed something more interesting: our minds routinely take mental shortcuts, and those shortcuts — while often efficient — can lead us reliably astray. Understanding why this happens is one of the most practically important questions in psychology.
🔍 Analogy — The Worn Path Through the Forest Imagine a forest where people have walked the same route for years. Over time, a clear path forms — it is easy to follow, requires no thought, and gets you somewhere quickly. But the worn path does not always lead to the best destination; it just leads to the most familiar one. Cognitive heuristics are like those worn paths in the mind: they are mental shortcuts formed through experience that guide thinking efficiently, but they can lead us to predictably wrong conclusions when the situation demands more careful navigation.
Core Concepts
Before we can understand why people make poor decisions, we need to understand the mental machinery that produces those decisions. The human brain processes an enormous volume of information every second. To manage this, it relies on simplified rules of thumb — strategies that reduce complex judgements to manageable ones. These strategies are not flaws in the system; they are features. But like any shortcut, they come with trade-offs.
📖 Key Definition — Heuristic A heuristic is a cognitive shortcut or simplified rule of thumb that the mind uses to make quick judgements and decisions, particularly in situations of uncertainty. Heuristics reduce the cognitive effort required for decision-making but can produce systematic errors known as cognitive biases.
Heuristics are not inherently problematic. In many everyday situations — choosing which queue to join, judging whether a stranger looks friendly, estimating how long a task will take — heuristics produce fast, reasonably accurate results. The problem arises when the same shortcuts are applied to situations that require more careful analysis, or when the