Introduction: Why Methodology Matters
Welcome to one of the most important chapters in your Psychology AS course! Think of methodology as the "behind-the-scenes" toolkit of a psychologist. It is the "how" and "why" of a study. In this chapter, we are looking specifically at how methodological issues apply to the Individual Differences area, focusing on the classic study by Freud (1909) and the contemporary study by Baron-Cohen et al. (1997). By understanding these issues, you will be able to evaluate any study like a pro. Don't worry if some terms feel like a lot to take in—we will break them down step-by-step!1. Research Methods and Techniques
Psychologists choose different methods depending on what they want to find out. In the Individual Differences section, we see two very different approaches:The Case Study (Freud)
Freud used a case study, which is an in-depth investigation of a single person (Little Hans).- Strength: It provides incredibly rich, detailed qualitative data that reveals things a simple survey couldn't.
- Weakness: Because it only looks at one person, the findings are hard to generalise (apply) to everyone else.
The Quasi-Experiment (Baron-Cohen et al.)
Baron-Cohen used a quasi-experiment. This is where the researcher investigates a difference that already exists (in this case, whether participants had Autism/Asperger’s Syndrome or not).- Strength: It allows researchers to study variables that they cannot ethically or physically change themselves (like having a disorder).
- Weakness: Because the researcher doesn't randomly assign people to groups, there might be other participant variables (differences) that affect the results.
Key Takeaway: Freud’s method is like a deep-dive into one person's life, while Baron-Cohen’s is like a scientific comparison between groups.
2. Types of Data: Qualitative vs. Quantitative
Data is just the information gathered during a study. There are two main types:Quantitative Data (Numbers)
Baron-Cohen gathered quantitative data using the "Eyes Task." For example, he recorded the mean score for the Autism group as \( 16.3 \) out of \( 25 \).- Strength: Easy to compare and analyse using statistics. It is objective (not based on opinion).
- Weakness: It doesn't tell us "why" someone felt a certain way; it lacks detail.
Qualitative Data (Words/Descriptions)
Freud’s study is almost entirely qualitative data—descriptions of Little Hans’s dreams and his fear of horses.- Strength: Very detailed and gives a full picture of the person’s experience.
- Weakness: Hard to summarise and can be subjective (the researcher might interpret the words in their own biased way).
Quick Review: Think Numbers = Nearly always quantitative. Letters/Language = Qualitative.
3. Ethical Considerations
All psychologists must follow the British Psychological Society (BPS) guidelines. These are grouped into four main headings:Respect
This includes informed consent (asking permission) and confidentiality (keeping names private). Example: Little Hans’s real name was Herbert Graf, but Freud used a pseudonym (a fake name) to protect his privacy.Competence
Psychologists must stay within what they are trained to do. They shouldn't give medical advice if they are only trained in research.Responsibility
This includes the protection of participants from harm and debriefing them after the study. Common Mistake: Students often think "harm" only means physical pain. In psychology, psychological harm (feeling stressed or embarrassed) is just as important!Integrity
Psychologists should be honest and avoid deception (lying to participants) unless it is absolutely necessary for the study to work.4. Validity: Are the results "true"?
Validity is about whether the study actually measures what it claims to measure.- Internal Validity: Is the test accurate? In Baron-Cohen’s study, did the "Eyes Task" really measure "Theory of Mind," or was it just measuring how good someone is at looking at pictures?
- Ecological Validity: Is the study like real life? Freud’s study has high ecological validity because it happened in Hans’s own home. Baron-Cohen’s Eyes Task has lower ecological validity because we don't usually see just a person's eyes in a static black-and-white photo in real life.
5. Reliability: Is the study consistent?
Reliability is about whether we would get the same result if we did the study again.- External Reliability: Can the study be replicated? Baron-Cohen’s study is highly reliable because the "Eyes Task" is standardised (everyone gets the same photos and the same instructions).
- Inter-rater Reliability: Do two different researchers agree on the results? In Freud’s study, this was low because Freud was the only one interpreting Hans’s dreams. If another psychologist looked at them, they might have had a different idea!
6. Sampling Bias and Ethnocentrism
Sampling Bias
This happens when the people in the study don't represent the whole population.- Freud: Huge bias! He studied one middle-class boy in Vienna. We can't assume every child in the world goes through the same thing.
- Baron-Cohen: Used a volunteer/self-selected sample for the Autism group. These people might be more motivated or have higher intelligence than the average person with Autism.
Ethnocentrism
This is the tendency to look at the world only from the perspective of your own culture. Example: Both studies were conducted in Western cultures (Austria and the UK). They assume that "Understanding Disorders" works the same way everywhere in the world, which might not be true!Final Quick Review Box
- Freud (1909): Case study, qualitative data, low reliability, high ecological validity, small sample.
- Baron-Cohen (1997): Quasi-experiment, quantitative data, high reliability, low ecological validity, larger (but still biased) sample.
- Remember the BPS Ethics: Respect, Competence, Responsibility, and Integrity.