Lecture 2 Social Psychology: Hindsight Bias, Scientific Method, and Theory Construction

The Paradox of Contradictory Proverbial Wisdom

Idiomatic Contradictions in Language: English contains numerous proverbs and sayings regarding human behavior that directly contradict one another. These pairs of opposites allow individuals to find perceived "truth" in almost any outcome, making them unreliable as predictive tools. * Examples of Contradictory Sayings: * "Opposites attract" vs. "Birds of a feather flock together." * "Out of sight, out of mind" vs. "Absence makes the heart grow fonder." * "Look before you leap" vs. "He who hesitates is lost." * "Two is company, three is a crowd" vs. "Two heads are better than one." * "The pen is mightier than the sword" vs. "Actions speak louder than words."
The Problem of Deriving Truth: Because these sayings suggest that both a behavior and its complete opposite are true, they cannot be used to derive actual scientific or psychological truths. People tend to focus only on the phrase that is consistent with their current belief or observation.
Coexistence of Opposites: The reason these contradictory ideas can coexist in the same language without being discarded through experience is explained by the first major concept in social psychology: the hindsight bias.

Defining and Understanding the Hindsight Bias

Textbook Definition: Hindsight bias is the tendency to overestimate, after learning an outcome, one's ability to have foreseen that outcome.
The "Obviousness" Illusion: Predictive tasks (e.g., elections, football games) are difficult to perform accurately before the event occurs. However, once the outcome is known, the result seems obvious, and individuals fool themselves into thinking they "knew it all along."
Hypothetical Example - Bombing Events: * Post-Event Reaction: An individual might say, "It was so obvious that this bombing was going to happen. I can't believe the government didn't foresee it." * Pre-Event Prediction: When asked where the next one might be, that same individual might say, "Well, the next one won't be so predictable." * Conclusion: Predicting events ahead of time is objectively difficult, but outcomes appear inevitable in hindsight.

Experimental Evidence of Hindsight Bias in Historical and Social Contexts

The British vs. Gurkhas War Study: This study was conducted approximately $50$ years ago. Participants are told about a war fought $100$ s and $100$ s of years ago between the British and the Gurkhas. * Advantaged Entities: * The British: Had a larger army and more advanced weaponry. * The Gurkhas: Had a longer history of warfare (tactics) and better knowledge of the terrain/land. * Methodology: * Group A: Told the British won and asked who they would have predicted to win. * Group B: Told the Gurkhas won and asked who they would have predicted to win. * Results: Invariably, participants claim they would have predicted the side they were told won the war. Knowing the outcome changes how the participant evaluates the preceding information (advantages/disadvantages).
The Social Proverb Study: Participants are presented with a series of quotations and asked whether they agree or disagree. * Condition 1: Participants read "Love is stronger than fear" and are told a story of a mother fighting a bear for her children. They typically agree, finding the logic sound. * Condition 2 (Mirror Image): Other participants read "Fear is stronger than love" and are told a story of a man running from a mugger, leaving his spouse behind. They also typically agree. * Condition 3: "He that has fallen cannot help him who is down" (You must be out of the hole to pull someone else up). Participants find this logical. * Condition 4: "He that has fallen can help him who is down" (Shared experience leads to empathy and teamwork). Participants also find this logical.
Psychological Mechanism: When presented with a statement, the human mind naturally searches only for information consistent with that statement. Once the saying is presented, it feels obvious, reinforcing the hindsight bias.

Real-World Applications and the Illusion of Predictability

Sports Coaching: Fans often believe they could coach better than professionals because they evaluate play calls based on the result. If a play fails, the fan claims it was "obvious" it would fail, ignoring the uncertainty that existed before the ball was snapped.
Elections and Trials: Once a candidate wins or a jury delivers a verdict, people convince themselves the outcome was a certainty from the beginning.
Believing Opposites Simultaneously: Hindsight bias allows people to believe opposites (e.g., "Opposites attract" on Monday versus "Birds of a feather" on Friday) because each statement triggers different memories that confirm the statement at hand, provided they aren't compared side-by-side.

Hindsight Bias in Academic Preparedness and Study Strategies

The Self-Assessment Trap: Students often study by looking at a study guide, reading a question (e.g., "What is the definition of hindsight bias?"), then immediately checking their notes for the answer. * The Error: Once the student reads the definition, it feels obvious. They say, "Oh, yeah, I would have known that," and move on. This is a delusion of knowledge created by hindsight bias.
Recommended Study Procedure: * Step 1: Study all notes thoroughly. * Step 2: Put all notes away. * Step 3: Pull out the self-assessment/study guide. * Step 4: Answer the questions without assistance. If you can produce the answer from scratch, you truly know it. If you cannot, you have avoided being fooled by the hindsight bias.

Social Psychology: Beyond Common Knowledge and Folklore

Critique of Social Science: Some critics argue that social science only discovers what is already found in an encyclopedia of quotations or that human behavior is "what you would expect."
The Rebuttal: Proverbial wisdom is contradictory and therefore not a reliable source of fact. Furthermore, the claim that behavior is "what you'd expect" is itself an example of hindsight bias—outcomes only feel expected after they are revealed.
Counterintuitive Nature: Social psychology is full of results that are non-obvious and counterintuitive, but the presence of hindsight bias makes it difficult for the public to appreciate how surprising those findings truly are.

The Scientific Method: A Systematic Process for Establishing Truth

Definition of Science: Carl Sagan described science as "a way of thinking more than it is a body of thought." It is a process used to arrive at truth claims while preventing scientists from fooling themselves.
The Six Basic Steps (Overview): 1. Define a Question: Formulate a specific research goal. For example, an educational psychologist might ask, "How do we improve children's performance (grades) in school?" Terms must be strictly defined. 2. Collect Background Information: Studies do not exist in isolation. Researchers look at preexisting literature. A general principle identified might be: Rewarding a behavior makes it more likely to occur. 3. Form a Hypothesis: Use background information to make a specific, testable prediction. e.g., "If we reward kids with ice cream for good grades, they will perform better on future tests." 4. Design a Study and Collect Data: This involves complex methodology and statistics. Example: Split a class in half; group $1$ gets ice cream for good grades, group $2$ gets nothing. Measure performance on a final exam where no ice cream is offered. 5. Interpret Data: Results are either consistent (support) or inconsistent (reject) with the hypothesis. * Note on Terminology: Science never uses the word "proof." Results "support" a hypothesis. Only mathematics and logic use "proof." 6. Revise the Theory: If data contradicts the hypothesis (e.g., kids rewarded with ice cream actually did worse due to the "justification effect"), the theory must be modified. Perhaps rewards only work if they are maintained, or perhaps they undermine intrinsic motivation. The cycle then returns to step $3$ to test the new revised theory.

The Nature and Function of Scientific Theories

The Real-World Definition: A scientific theory is a general framework constructed to explain how and why people behave as they do. It describes the relationship between variables (e.g., environment and behavior).
Theory vs. Layperson "Guess": * In casual conversation, "theory" means a guess (e.g., "I have a theory about why my friend is late"). * In science, a theory is a high-level framework explaining facts. Gravity will always be a "theory" because it is the framework that explains the fact that objects fall.
Misinterpretations in Public Discourse: Some argue that concepts like evolution are "just a theory, not a fact." In science, a theory is actually greater than a fact because it provides the explanation for the observation.
Utility of Theories: They allow for specific predictions in novel situations (e.g., predicting that a clicker will fall with $100\%$ accuracy even if never dropped in that room before) and tell scientists which variables are irrelevant (e.g., the color of the object in gravity experiments).

Criteria for Evaluating the Quality of a Scientific Theory

Broad Applicability: The theory should explain a wide range of phenomena. The theory of gravity explains both falling objects on Earth and the movement of galaxies.
Simplicity (Parsimony): A theory should not require unnecessary assumptions. A theory of dreaming involving "invisible elves" is bad because it assumes the existence of elves without evidence.
Predictive Power: A theory must make specific predictions about what will happen under condition $A$ . If it cannot predict future events, it cannot be tested.
Falsifiability (Testability): A theory must make predictions that could, in principle, be proven wrong. * Scientific strength comes from failing to prove a theory wrong despite repeated attempts. * If a clicker floated in the air, gravity would be falsified. Because this never happens, we have high confidence in the theory, though it is never "proven" as absolute, unupdatable truth.

Case Study: The Flying Spaghetti Monster as a Falsification Exercise

The Hypothesis: The universe was created by an invisible, untouchable, silent Flying Spaghetti Monster (FSM). This being changes measurements to mask its presence.
Student Interaction: One student noted they had heard of this "a few months ago," to which the lecturer clarified the concept is a "tongue-in-cheek" joke used to illustrate scientific principles.
Evaluation via Scientific Criteria: * Broad Applicability: High (explains the whole universe). * Simplicity: Low (requires assuming an unobserved entity). * Predictive Power: Low (makes no testable claims except for the afterlife). * Falsifiability: Non-existent (if the entity changes all measurements to hide, there is no difference between its existence and non-existence). Thus, FSM is not a valid scientific theory.