Unit 0: Science Practices
Topic 0.4: Research Design and Ethics
The Big Picture: Designing Studies Responsibly
Once a psychologist formulates a hypothesis, they have to figure out the best way to test it. Do they need numbers, or do they need stories? Do they need to perfectly recreate real life, or is a sterile laboratory better? And most importantly, how do they ensure that the human beings (or animals) involved in the study walk away unharmed? This topic explores the mechanics of research design and the strict ethical guidelines that keep science safe.
1. Choosing a Research Design
The process of determining which research design to use depends entirely on the question being asked. If a researcher wants to know what percentage of teenagers own a smartphone, they use a survey. If they want to know *how* a specific teenager feels about social media deeply changing their friendships, they might use an in-depth case study. Data generally falls into two distinct categories:
- Quantitative Research: Research that translates the social world into numbers that can be treated mathematically. Example: Recording the exact number of seconds it takes a mouse to run a maze, or calculating the average SAT score of a high school.
- Qualitative Research: Research that focuses on non-numerical data, such as subjective experiences, feelings, or beliefs. Example: Analyzing the written transcripts of an interview with a patient suffering from depression.
Sometimes, psychologists need to turn subjective feelings (qualitative) into hard numbers (quantitative) to run statistical analyses. A great tool for this is using Likert Scales, a type of survey response scale that asks respondents to rate their level of agreement on a range. Example: Rating the statement "I feel anxious today" on a scale from 1 (Strongly Disagree) to 5 (Strongly Agree).
2. The Laboratory vs. Everyday Life
You might wonder: "How can an experiment in a sterile, windowless laboratory tell us anything about real life?" The value of simplified laboratory conditions is that they allow researchers to isolate cause and effect by controlling all confounding variables. The goal of an experiment is not to perfectly recreate the exact behaviors of everyday life, but to test the underlying theoretical principles.
Example: A researcher might have participants play a competitive computer game in a lab and measure how often they blast a loud noise at their opponent. That exact scenario doesn't happen in real life. However, it reveals the underlying principle of *aggression*, which perfectly helps us understand real-world behaviors like road rage or sports violence.
3. The Rules of the Game: Ethics
In the past, psychologists conducted some incredibly questionable experiments (which we will learn about in later units!). Today, strict rules safeguard human and animal welfare. Before any data can be collected, every study must be approved by an Institutional Review Board (IRB)—a committee that reviews research proposals to ensure they are ethical and protect the rights, safety, and well-being of participants.
The Core Ethical Guidelines for Human Participants
The APA (American Psychological Association) outlines specific rules that must be followed in every study:
- Informed Consent: The process of giving participants enough information about a study (its purpose, procedures, risks) so they can voluntarily decide whether to participate.
- Informed Assent: Agreement from a minor (or someone who cannot legally give full consent) to participate after the research has been explained in a way they can understand. Example: A parent gives legal consent for their 7-year-old, but the 7-year-old must still give their assent.
- Protection from Harm: Researchers must ensure participants do not suffer undue physical or psychological harm. They cannot be traumatized or put in unreasonable physical danger.
- Confidentiality: The ethical principle that personal information obtained from a participant should not be revealed without permission. Data is usually published anonymously as a group average, never attaching names to test scores.
- Debriefing: Sometimes researchers have to use deception to get genuine reactions. For instance, they might use Confederates (actors who secretly work for the researcher while pretending to be regular participants). If deception is used, the researcher MUST provide a debriefing—a post-experimental explanation of the study's true purpose and any deceptions used, ensuring the participant leaves feeling okay.
The Stanford Prison Experiment (1971): Conducted by Philip Zimbardo at Stanford University, psychologically healthy college students were randomly assigned as "guards" or "prisoners" in a mock prison. The study was aborted after only six days because the "guards" engaged in severe psychological abuse, and "prisoners" showed signs of extreme trauma. You will learn more about this experiment in Unit 4!
Why Study Animals?
Psychologists study animals to understand species differences, but more often, they study animals to learn about people. Because humans and animals share common biology (like similar nervous systems and identical ways of learning through rewards), studying a rat or a pigeon can reveal fundamental laws of behavior. Just like with humans, animal research is strictly governed by ethical codes requiring humane care, healthy living conditions, and the minimization of pain.
4. AP Science Practice Focus: Ethical Scenarios
According to the College Board's framework, Practice 2.D requires students to "Evaluate whether a psychological research scenario followed appropriate ethical procedures." On the exam, you will be given a description of an experiment and you must play the role of the Institutional Review Board, actively checking off whether the researcher respected consent, confidentiality, and debriefing.
📝 The AAQ Exam Connection
Ethical guidelines are a major part of the Article Analysis Question (AAQ) FRQ. On Part D of every single AAQ you will be directly tested on these concepts.
- Part D (Identify an Ethical Guideline): Based on a 2025 update, you will now be asked to do two things with ethical guidelines. First, you must identify one ethical guideline that the researchers in the provided text successfully followed. If you only do this you will not earn the point! Once you identify the ethical guideline you then have to describe how they applied it.
- Pro-Tip: Scan the article for clues. Did participants sign a waiver before starting? (Informed Consent). Were their names removed from the published data? (Confidentiality). Did the researcher explain the trick at the end of the study? (Debriefing).
5. Don't Trip Up! (Common Misconceptions)
⚠️ Anonymity vs. Confidentiality: These are different! Anonymity means absolutely no one knows who the participants are, not even the researcher collecting the data (like an unsigned drop-box survey). Confidentiality means the researcher does know who you are, but ethically promises to keep that information a secret from the public.
⚠️ Values in Science: Is psychology 100% objective? No! Psychologists' personal values heavily influence what topics they choose to study and how they apply their results. A researcher who values independence might study the negative impacts of conformity, while a researcher from a culture that values community might study the exact same concept as a positive social glue.
6. Level Up Your Score: Interactive Review
Ensure these ethical guidelines are locked in by practicing with our review tools:
- Flashcard Drill: Head to our Flashcards and review the "Unit 0" deck to master the differences between Consent and Assent.
- Connections: Play Connections and see if you can successfully group all the APA Ethical Guidelines together in one category!
- Unit 0 Quiz: Verify your understanding of the Institutional Review Board and research design with our adaptive quiz.