Psychological Research Methods: Concepts, Ethics, and Critical Thinking
The Importance of Psychological Research
Distinguishing Facts from Opinions: Research is the fundamental process that differentiates facts from mere opinions.
Scientific Method: Psychologists rigorously use the scientific method to conduct research, which is essential for confirming facts.
Empirical Research: Facts can only be established through empirical research. The term "empirical" means observed, indicating that knowledge is gained through direct observation and experience.
The Scientific Method: Steps and Principles
Steps in the Scientific Method:
Identify the Question: Define the specific question that needs to be researched.
Formulate a Hypothesis: Develop a testable prediction based on an existing theory. A theory is a broad but well-developed explanation about the world.
Test the Hypothesis: Design and conduct a study or experiment to empirically test the prediction.
Draw Conclusions: Analyze the results of the test to determine whether the hypothesis is supported or refuted.
Report Results: Share the findings with the scientific community. This allows others to attempt replication, repeating the study or experiment to verify the results and demonstrate their reliability.
Falsifiability of Hypotheses: A scientific hypothesis must be falsifiable, meaning it is capable of being shown to be incorrect. This reliance on falsifiability is crucial for generating high confidence in the information produced by scientific research, as only ideas that can withstand attempts at disproof are accepted.
Research Methods for Examining Behavior
Case (Clinical) Studies
Definition: An in-depth study of one (or a very few) individuals.
Advantage: Provides a tremendous amount of detailed information.
Disadvantage: Findings cannot be generalized or applied to the larger population as a whole due to the unique nature of the individual(s) studied.
Famous Examples:
Canadian conjoined twins, Krista and Tatiana Hogan (New York Times, 2011).
Phineas Gage (1948), known for a severe brain injury and subsequent personality changes.
Naturalistic Observation
Definition: Involves watching animals or humans behave in their normal, natural environment.
Major Advantage: Offers a realistic picture of behavior as it occurs organically.
Disadvantages:
Difficulty in Setup and Control: It can be challenging to set up and control variables within a natural setting.
Observer Effect: The tendency of people or animals to behave differently from normal when they are aware of being observed. This can alter the natural behavior researchers aim to study.
Participant Observation: A strategy to reduce the observer effect, where the observer becomes an active participant in the group being observed.
Observer Bias: The tendency of observers to see what they expect to see, which can skew their interpretations of behavior.
Blind Observers: Individuals who do not know the specific research question, employed to mitigate observer bias.
Surveys
Definition: A method using a series of questions (paper, electronic, or verbal) to which participants respond about a specific topic.
Administration: Typically given to a representative sample, which is a randomly selected subset of subjects from a larger population of interest, ensuring the sample reflects the larger group.
Advantages:
Large Data Collection: Allows for gathering data from a vast number of people quickly.
Study Covert Behaviors: Can explore behaviors that are not directly observable (e.g., attitudes, beliefs, private experiences).
Disadvantages:
Ensuring Representativeness: Crucially, the sample must be truly representative; otherwise, the results will not be meaningful or generalizable.
Accuracy of Responses: Participants may not always provide accurate responses due to memory issues, social desirability, or courtesy bias (the tendency to give answers that are perceived as more polite or socially acceptable rather than truthful).
Correlational Technique
Definition: A measure of the relationship between two variables (e.g., smoking and weight gain).
Variable: Anything that can change or vary.
Correlation Coefficient (): A mathematical formula processes measures of two variables to produce a correlation coefficient, which indicates two key aspects of the relationship:
Direction of the relationship: Whether variables change together in the same or opposite ways.
Strength of the relationship: How closely the variables are associated.
Predictive Power: Knowing the value of one variable allows researchers to predict the value of the other variable, though this prediction doesn't imply causation.
Range of : The correlation coefficient ranges from to .
Strength Interpretation: The closer is to or , the stronger the relationship between the variables.
No Correlation: $R = 0.0$ indicates no linear relationship.
Perfect Correlation: $R = -1.00$ or $R = +1.00$ indicates a perfect relationship (though rare in real-world psychology).
Types of Correlation:
Positive Correlation: Variables are related in the same direction. As one variable increases, the other also increases; as one decreases, the other decreases (e.g., as eating increases, weight increases).
Negative Correlation: Variables are related in opposite directions. As one variable increases, the other decreases (e.g., as exercise increases, weight decreases).
Important Distinction: Correlation is NOT Causation: Although a correlation indicates a relationship, it does not mean that one variable causes changes in the other. There might be a third, unmeasured variable influencing both, or the direction of causality might be opposite to what is inferred.
The Experiment
Definition: An experiment involves the deliberate manipulation of one or more variables to observe if corresponding changes in behavior result, which allows for the determination of cause-and-effect relationships.
Operational Definition: This is a specific definition of a variable of interest that allows it to be directly measured. For example, in studying "violent TV," an operational definition might be "aggressive play."
Independent Variable (IV): The variable in an experiment that is manipulated or changed by the experimenter. It is the presumed cause.
Example: Exposure to violent TV.
Dependent Variable (DV): The variable in an experiment that represents the measurable response or outcome, reflecting the effect of the independent variable. It is the presumed effect.
Example: Aggression (measured as aggressive play).
Experimental Group: The group of subjects in an experiment who are subjected to or receive the independent variable (e.g., watching violent TV).
Control Group: The group of subjects in an experiment who are not subjected to the independent variable. They may receive a "placebo" treatment to control for confounding variables.
Example: Not watching violent TV.
Random Assignment: The process of assigning subjects to either the experimental or control groups randomly. This ensures that each subject has an equal chance of being in either group, which is critical for controlling for confounding (extraneous) variables (variables other than the IV that could influence the DV). Random assignment helps ensure the groups are as similar as possible before the manipulation of the IV.
Controlling for Bias in Experiments
Placebo Effect
Definition: The phenomenon where the expectations of participants in a study can significantly influence their behavior or experienced outcomes, even if they receive an inert or inactive treatment.
Single-Blind Study: A research design where subjects do not know if they are in the experimental or control group. This method primarily reduces the placebo effect by preventing participants' expectations from biasing their responses.
Experimenter Bias (Effect)
Definition: The tendency of the experimenter’s expectations for a study to unintentionally influence the results of the study. This can happen through subtle cues or differences in how experimenters interact with participants in different groups.
Double-Blind Study: A research design where neither the experimenter nor the subjects know if the subjects are in the experimental or control group. This method controls for both the placebo effect and the experimenter effect, providing a more objective assessment of the independent variable's impact.
Ethical Concerns in Conducting Research
Ethics Committees / Institutional Review Board (IRB)
Role: Groups typically composed of psychologists and other professionals (e.g., lawyers, community members) who review each proposed research study. They judge its ethical soundness, safety, and consideration for the well-being of participants. These committees are often referred to as Institutional Review Boards (IRB).
Common Ethical Guidelines for Human Participants
Balancing Rights vs. Value: The rights and well-being of participants must always be carefully weighed against the scientific value of the study.
Informed Consent: Participants must be allowed to make an informed decision about their participation. This involves providing them with sufficient information about the study's purpose, procedures, potential risks, and benefits before they agree to participate.
Justified Deception: If deception (purposefully misleading participants) is used, it must be fully justified by the potential scientific value of the study, and there should be no other feasible way to conduct the research without it.
Right to Withdraw: Participants must be explicitly informed that they can withdraw from the study at any time without penalty.
Protection from Risks: Participants must be protected from physical or psychological risks, or if risks are unavoidable, they must be explicitly informed of these risks beforehand.
Debriefing: After the study, the investigator must debrief participants, explaining the true nature and purpose of the study, and sharing expectations or preliminary results. This is especially crucial when deception has been employed.
Confidentiality: All data collected from participants must remain confidential, ensuring their privacy and anonymity.
Animal Research
Purpose: Animal research often addresses questions that would be unethical or impractical to study with human participants.
Ethical Focus: The primary ethical consideration in animal research is to avoid exposing animals to unnecessary pain or suffering.
Prevalence: Animals are utilized in approximately of psychological studies when appropriate and necessary.
Critical Thinking
Definition: Critical thinking involves making reasoned judgments about claims, rather than blindly accepting them.
Four Basic Criteria:
Skepticism Towards "Truths": Very few claims should be accepted as absolute "truths" without being subjected to rigorous testing and evidence.
Quality of Evidence: Not all evidence is equal in quality. Critical thinkers evaluate the source, methodology, and biases inherent in evidence.
Authority Limitations: Just because someone is considered an authority or has significant expertise does not automatically make all their claims true. Even experts can be wrong.
(Implied fourth criterion, often tied to logical fallacies or biases, though not explicitly listed as a point on page 21 beyond the third point: considering alternative explanations and avoiding emotional reasoning).
Pseudopsychologies
Definition: Pseudopsychologies are systems for explaining human behavior that are not based on, or consistent with, scientific evidence. They often lack empirical support and falsifiability.
Examples:
Phrenology: The practice of reading bumps on the skull to determine personality traits and mental abilities.
Palmistry: The practice of reading palms to predict future events or reveal character traits.
Graphology: The analysis of personality traits through handwriting.