Key Studies on Thinking and Decision-Making 🧠

Introduction: Why do people make “wrong” choices? 👀

students, every day you make decisions that feel simple but are actually based on hidden mental shortcuts. You decide what to wear, whether to trust a rumor, how to answer a multiple-choice question, or whether a headline sounds believable. The cognitive approach explains behaviour by focusing on mental processes such as attention, memory, thinking, and decision-making. In this lesson, you will study key research that shows how people think, judge, and sometimes make predictable mistakes.

Learning goals

By the end of this lesson, students, you should be able to:

explain the main ideas and terms in key studies on thinking and decision-making,
apply IB Psychology reasoning to these studies,
connect these studies to the broader cognitive approach,
summarize why these studies matter for understanding behaviour,
use evidence from research to support an answer in IB Psychology.

These studies are important because they show that human thinking is not always fully logical. Instead, people often use shortcuts called heuristics, and they can also be influenced by schemas, framing, and memory biases. That helps psychologists understand why people sometimes misjudge situations in real life, from diagnosing illness to believing fake news 📱.

Study 1: Tversky and Kahneman — Heuristics and biases

One of the most famous studies in cognitive psychology comes from Amos Tversky and Daniel Kahneman. They investigated how people make decisions under uncertainty. Their work showed that people often use mental shortcuts called heuristics rather than carefully calculating every possible outcome.

A heuristic is a simple rule of thumb that helps people make quick judgments. Heuristics can be useful because they save time and mental effort. However, they can also lead to systematic errors, called biases. Two key heuristics are the availability heuristic and the representativeness heuristic.

The availability heuristic happens when people judge how likely something is based on how easily examples come to mind. For example, after watching several news reports about shark attacks, students might overestimate how common shark attacks are, even though they are very rare. The representativeness heuristic happens when people judge something by how closely it matches a stereotype or typical example. For instance, a student wearing glasses and reading a science magazine might be judged as more likely to be a scientist, even though many other people could fit that description.

Tversky and Kahneman also showed that people do not always follow the laws of probability. In one famous line of research, participants were asked to solve problems involving probability and logical judgment. Their responses often showed that people relied on intuitive thinking instead of formal logic. This supports the idea that cognition is limited and influenced by shortcuts.

These findings are useful in real life. Doctors may use quick judgments when diagnosing symptoms, and this can sometimes lead to errors if they rely too much on a first impression. Likewise, judges or teachers may form unfair expectations about someone based on one detail. In IB Psychology, this study is important because it demonstrates that cognition is active and efficient, but not always accurate.

Study 2: Wason — Confirmation bias and reasoning

Peter Wason studied how people test ideas and solve logic problems. His work showed that people often look for information that confirms what they already believe, rather than trying to disprove it. This is called confirmation bias.

In Wason’s classic selection task, participants saw cards with letters and numbers and had to choose which cards to turn over in order to test a rule. Many people chose cards that seemed likely to confirm the rule instead of cards that could actually disprove it. This reveals a common mistake in human reasoning: people often search for evidence that fits their existing belief, even when that is not the best strategy.

For example, if students believes that “all athletes are confident,” you may pay attention to examples of confident athletes and ignore shy athletes who also play sports. That is confirmation bias in everyday life. It is especially relevant in social media, where people tend to follow accounts and read posts that already match their opinions 📲.

Wason’s research links to the cognitive approach because it shows that thinking is shaped by internal mental processes, not just outside events. It also supports the idea that cognition can be biased by expectations and prior knowledge. In exam answers, you should explain that his study highlights the limits of rational thinking and the influence of schemas on judgment.

Study 3: Kahneman and Tversky — Framing effects

Another important idea from Kahneman and Tversky is framing. Framing means that the way information is presented can change the decision people make, even when the actual facts are the same.

For example, imagine two hospitals describe a surgery in two different ways: one says there is a $90\%$ survival rate, while the other says there is a $10\%$ mortality rate. Both statements mean the same thing, but many people feel more positive about the first one. This happens because people react not only to content, but also to wording.

Framing effects matter in health, advertising, and politics. A product may be advertised as “$95\%$ fat free” instead of “$5\%$ fat,” even though both describe the same thing. People often prefer the positively framed version because it sounds safer or better. This shows that cognition is not purely logical; it is influenced by how information is presented.

In cognitive psychology, framing is important because it helps explain how people evaluate choices. It also connects with decision-making under uncertainty, where individuals may not calculate outcomes exactly but instead use surface features of a message. students, this is a strong example to use when describing why cognition can be predictable yet biased.

Study 4: Loftus and Palmer — Memory and reconstructive thinking

Although Loftus and Palmer are best known for memory research, their findings also help explain decision-making because people often make judgments based on remembered information. They showed that memory is reconstructive, meaning people do not simply replay events like a video. Instead, memory can be influenced by questions, wording, and later information.

In their study, participants watched film clips of car accidents and were then asked questions using different verbs, such as “smashed,” “collided,” or “contacted.” The wording changed participants’ speed estimates. Later, when asked whether they saw broken glass, those who heard stronger verbs were more likely to report seeing it, even when there was no broken glass.

This matters for thinking and decision-making because people often use memory to make judgments. If memory is distorted, then decisions can be distorted too. For example, a witness may confidently identify a suspect because their memory has been shaped by leading questions. A customer may decide a restaurant is unsafe after hearing a dramatic story, even if the story is inaccurate.

This study is relevant to the cognitive approach because it shows that cognition is constructive, not passive. People actively build memories using what they already know and what they are later told. That makes memory an important part of how people think and decide.

How these studies fit together

students, these studies all show a central idea in the cognitive approach: behaviour depends on mental processes that can be studied scientifically. Tversky and Kahneman showed that people use heuristics and are affected by framing. Wason showed that people often seek confirming evidence. Loftus and Palmer showed that memory can be changed by wording and can affect later judgments.

Together, they show that human thinking has strengths and limits. Heuristics help people make fast decisions, but they can create bias. Confirmation bias can protect existing beliefs, but it can also block accurate reasoning. Reconstructive memory helps people make sense of the world, but it can also create errors. These studies all support the cognitive view that behaviour is linked to internal mental processes and that those processes can be influenced by schemas, prior knowledge, and context.

For IB Psychology, it is important to connect these ideas to broader themes such as reliability of cognition, the role of schemas, and real-world applications. For example, in medicine, education, law, and media, people must make decisions quickly and often with incomplete information. Cognitive research helps explain why mistakes happen and how decision-making might be improved.

Conclusion: Why these studies matter ✅

The key studies on thinking and decision-making are important because they show that people are not always perfectly rational. Instead, they rely on heuristics, are influenced by framing, often seek confirming evidence, and can be misled by memory processes. These findings are a major part of the cognitive approach to understanding behaviour because they reveal how mental processes shape actions in everyday life.

If students can explain each study, use the correct terminology, and connect the findings to real-world examples, you will be well prepared for IB Psychology questions on cognitive explanations of behaviour. Remember: in this topic, the focus is not just on what people do, but on how they think before they act.

Study Notes

The cognitive approach studies internal mental processes such as thinking, memory, attention, and decision-making.
A heuristic is a mental shortcut that helps people make quick judgments.
The availability heuristic depends on how easily examples come to mind.
The representativeness heuristic depends on similarity to a stereotype or prototype.
Bias is a systematic error in thinking or decision-making.
Confirmation bias is the tendency to look for information that supports an existing belief.
Framing effects show that the wording or presentation of information can change decisions.
Loftus and Palmer showed that memory is reconstructive and can be influenced by leading questions.
These studies show that cognition is both useful and fallible.
In real life, these ideas apply to medicine, law, education, advertising, and media.
For IB answers, students should define key terms, describe the study clearly, and explain its link to the cognitive approach.
Strong answers include an example showing how the research applies outside the lab.