Welcome to the World of Psychological Research!
Ever wondered how psychologists actually "know" what they know? They don't just guess; they use specific research methods to investigate human behavior. In this chapter, we are going to look at the four main tools in a psychologist’s toolkit: Experiments, Observations, Self-reports, and Correlations.
Don't worry if some of these terms sound a bit scientific at first. By the end of these notes, you’ll see that these methods are just organized ways of asking questions about the world. Let’s dive in!
1. Experiments
The main goal of an experiment is to find out if one thing causes another. This is called looking for cause-and-effect. Psychologists change one variable to see how it affects another.
Types of Experiments
Laboratory Experiment: These happen in a controlled environment (like a room at a university). The researcher has high control over everything that happens.
Example: Testing if a specific noise level affects how many words a person can memorize in a quiet room vs. a loud room.
Strength: Very easy to repeat (replicable) because it is so controlled.
Weakness: Can feel "fake," so people might not act naturally (low ecological validity).
Field Experiment: These happen in a real-world setting, like a school or a shopping center. The researcher still changes something, but the participants are in their natural environment.
Example: A researcher drops their books in a busy hallway to see if people stop to help.
Strength: Behavior is more natural because people are in a real setting.
Weakness: Harder to control extraneous variables (like a sudden loud bell ringing that distracts people).
Quasi Experiment: In these, the researcher doesn't actually change the main variable. The "difference" already exists naturally in the people being studied.
Example: Comparing the memory of people who are 20 years old vs. people who are 70 years old. The researcher didn't make them 20 or 70; they were already that age.
Strength: Allows us to study things we can't ethically or physically change (like age or gender).
Weakness: You can't be 100% sure the "cause" is what you think it is, because you didn't control the groups yourself.
Quick Review: Lab = Total Control. Field = Real Life. Quasi = Pre-existing groups.
Key Takeaway:
Experiments are the best way to find cause-and-effect, but you have to balance control with natural behavior.
2. Observation
Sometimes, the best way to understand people is just to watch them! Observations involve watching and recording behavior as it happens.
How we watch (The Setting)
Naturalistic Observation: Watching behavior in its "natural habitat" without interfering.
Example: Watching how children play on a school playground.
Controlled Observation: Watching behavior in a room where the researcher has set up specific conditions.
Example: Watching how a child reacts to a specific new toy in a play-lab.
The "Who" and "How"
Participant Observation: The researcher joins in with the group they are studying.
Analogy: Like an undercover boss working alongside their employees to see what the job is really like.
Non-participant Observation: The researcher stays separate and just watches from a distance.
Overt Observation: The participants know they are being watched.
Covert Observation: The participants are unaware they are being watched (it's "undercover").
Recording the Data
Structured Observation: The researcher uses a "tally chart" or coding frame to count specific behaviors (e.g., "How many times did they smile?").
Unstructured Observation: The researcher just writes down everything they see in a descriptive way (like a diary entry).
Did you know? A common mistake is thinking "Naturalistic" and "Covert" are the same. You can do a "Naturalistic Overt" observation where you sit in a park with a clipboard—everyone sees you, but the park is still a natural setting!
Key Takeaway:
Observations give us great detail about what people actually do, rather than what they say they do.
3. Self-Report
A self-report is exactly what it sounds like: asking people to report on their own thoughts, feelings, or behaviors.
Questionnaires
These are sets of written questions. They can be done on paper or online. They are great for getting lots of data from many people quickly.
Weakness: People might lie to look better (this is called Social Desirability Bias).
Interviews
Structured Interview: Every person is asked the exact same questions in the exact same order. No skipping!
Unstructured Interview: More like a conversation. There is a topic, but the interviewer can ask follow-up questions based on the answers.
Semi-structured Interview: A mix of both. There are some set questions, but the interviewer has the freedom to explore interesting points.
Memory Aid: Think of a Structured interview as a Script, and an Unstructured interview as a Chat.
Key Takeaway:
Self-reports are the only way to find out what is happening inside someone's head, but you have to trust that they are being honest.
4. Correlation
A correlation is a way of measuring the relationship between two variables. We don't change anything; we just see if two things "go together."
Types of Correlation
Positive Correlation: As one variable goes up, the other goes up too.
Example: The more hours you spend revising, the higher your test score tends to be.
Negative Correlation: As one variable goes up, the other goes down.
Example: The more hours you spend playing video games, the lower your test score might be.
No Correlation: There is no link at all.
Example: Your shoe size has no link to your test score.
Common Mistake Alert! Correlation does NOT equal causation. Just because two things are linked doesn't mean one caused the other.
Example: Ice cream sales and shark attacks both go up in the summer. Does eating ice cream cause shark attacks? No! The "third variable" is the hot weather (more people buy ice cream AND more people go in the ocean).
Key Takeaway:
Correlations are great for spotting patterns, but they don't tell us why the pattern exists.
Quick Summary Checklist
Before you move on, make sure you can answer these:
1. Which method looks for cause-and-effect? (Answer: Experiment)
2. What do we call it when participants don't know they are being watched? (Answer: Covert Observation)
3. What is the main problem with self-reports? (Answer: Social Desirability/Honesty)
4. Can a correlation prove that one thing causes another? (Answer: No!)