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  1. Chapter 1: Thinking Critically With Psychological Science

  2. SQ3R • Survey, Question, Read, Recite, and Review, SQ3R is a study method that encourages active processing of new information. • Distributing study time, listening actively in class, overlearning, focusing on big ideas, and being a smart test-taker will also boost learning and performance.

  3. Intro • Our intuition is often wrong when it comes to physical reality • If you drop a bullet off a table 3 feet high, and fire another one straight across an empty football field, which hits the ground first?

  4. Intro • We are all amateur psychologists, suggested Fritz Heider, who attempted to explain others’ behavior (see Chapter 18). That need for a coherent world, however, sometimes leads to error. • There are limits to intuition and common sense • It is surprising that just a few minutes after seeing the effect scene, people would reliably claim to have seen the cause scene.

  5. Intro • We tend to believe that we can accurately remember what we saw just a few minutes ago. • Memory for pictures tends to be more accurate than memory for words. • We put a lot of confidence in things that we have seen with our own eyes.

  6. Intro • Application to eyewitness testimony in the courtroom is clear. Typically, cases go to trial many months after the events occur, very likely making eyewitnesses more vulnerable to inference-based errors. Misremembering the causes of others’ behavior over long periods may also foster conflict in social relationships.

  7. Intro • Importantly, the research indicated that causal-inference errors were common in a backward but not a forward direction. • That is, exposure to “effect” pictures caused illusory memories of seeing “cause” pictures, but exposure to “cause” pictures did not produce false memories of seeing “effect” pictures. The researchers speculate that there is a stronger need to answer “Why?” than to answer “What would happen if . . . ?”

  8. Hindsight Bias • I-knew-it-all-along phenomenon • Is the tendency to believe, after learning an outcome, that one would have foreseen it. • Finding out that something has happened makes it seem inevitable. • Thus, after learning the results of a study in psychology, it may seem to be obvious common sense.

  9. However……….. • Experiments have found that events seem far less obvious and predictable beforehand than in hindsight. • Sometimes psychological findings even jolt our common sense.

  10. Overconfidence • The Confirmation Bias: Overconfidence stems partly from our tendency to search for information that confirms our preconceptions. • Our everyday thinking is limited by our tendency to think we know more than we do. • Asked how sure we are of our answers to factual questions, we tend to be more confident than correct. • Despite lackluster predictions, the overconfidence of experts is hard to dislodge.

  11. Overconfidence • It is really intellectual conceit!!! • The Psychic: ESP……….

  12. Scientific attitude encourages critical thinking • Scientific attitude reflects a hard-headed curiosity to explore and understand the world without being fooled by it. • Critical thinking: examine assumptions, discern hidden values, evaluate evidence, and assess conclusions.

  13. Scientific attitude encourages critical thinking • Active listening and participation is a requirement for learning and mastering a subject. • The study of psychology can help us to think critically. Remember that psychologists are scientists. • The scientific approach can help us evaluate competing claims and ideas regarding phenomena ranging from subliminal persuasion, ESP, and mother-infant bonding to astrology, basketball streak-shooting, and hypnotic age regression.

  14. Scientific attitude encourages critical thinking • An important goal of this course is to teach questioning thinking that examines assumptions, discerns hidden values, evaluates evidence, and assesses conclusions. • Psychology’s critical inquiry has produced surprising findings that have sometimes debunked popular beliefs.

  15. Scientific attitude encourages critical thinking • While making decisions, discerning people will welcome the powers of their gut wisdom yet know when to restrain it with rational, reality-based critical thinking. (e.g., assessing suicide risk, jurors, truth from deception, sports, religion).

  16. Scientific attitude encourages critical thinking • Our intuitions provide us with useful insights but they can also seriously mislead us. • The scientific method provides us with a very important tool in helping us sift sense from nonsense.

  17. Scientific attitude encourages critical thinking • Randolph A. Smith’s Challenging Your Preconceptions: Thinking Critically About Psychology: • Guidelines for critical thinking…

  18. Scientific attitude encourages critical thinking • Smith’s Guidelines for critical thinking… • Critical thinkers are open-minded. They can live with uncertainty and ambiguity. • Critical thinkers are able to identify inherent biases and assumptions. They know that people’s beliefs and experiences shape the way they view and interpret their worlds.

  19. Scientific attitude encourages critical thinking • Smith’s Guidelines for critical thinking… • Critical thinkers practice an attitude of skepticism. They have trained themselves to question the statements and claims of even those people they respect. They are ready to reexamine their own ideas. • Critical thinkers distinguish facts from opinions. They recognize the need to rely on scientific evidence rather than personal experience.

  20. Scientific attitude encourages critical thinking • Smith’s Guidelines for critical thinking… • Critical thinkers don’t oversimplify. They realize the world is complex and there may be multiple causes for behavior. • Critical thinkers use the processes of logical inference. They carefully examine the information given and recognize inconsistencies in statements and conclusions.

  21. Scientific attitude encourages critical thinking • Smith’s Guidelines for critical thinking… • Critical thinkers review all the available evidence before reaching a conclusion. They will consult diverse sources of information and consider a variety of positions before making a judgment.

  22. Psychological theories guide scientific research • A useful theory effectively organizes a wide range of observations and implies testable predictions, called hypotheses. • Research: test and reject or revise a particular theory.

  23. The Science of Psychology: The Scientific Method

  24. Predictions • They specify in advance what results would support the theory and what results would disconfirm it. • As an additional check on their own biases, psychologists report their results precisely with clear operational definitions of concepts.

  25. Operational Definitions • Define research variables that allow others to replicate, or repeat, their observations. • Often, research leads to a revised theory that better organizes and predicts observable behaviors or events. • Must be clear, concise, specific!

  26. Case Studies • Case Studies are a method by which psychologists analyze one or more individualsor groups in great depth in the hope of revealing things true of us all. While individual cases can suggest fruitful ideas, any given individual may be atypical, making the case misleading.

  27. Case Studies • Leary identifies four uses of the case study in behavioral research. • First, as the text suggests, a case study may be used as a source of insights and ideas, particularly in the early stages of investigating a specific topic. (e.g., Freud’s theory of psychoanalysis emerged from his case studies of therapy clients. Piaget’s theory of cognitive development arose from case studies of his own children)

  28. Case Studies • Second, case studies may be used to describe particularly rare phenomena (e.g., people who have killed or tried to kill U.S. presidents; Investigations of mass murders also are limited to a case study approach; Luria used a case study to describe another rare phenomenon—a man who had nearly perfect memory).

  29. Case Studies • Third, case studies in the form of psychobiographies involve the application of psychological concepts and theories in an effort to understand the lives of famous people, such as da Vinci, Martin Luther, Mahatma Gandhi,Richard Nixon.

  30. Case Studies • Finally, case studies provide illustrative anecdotes. Researchers and teachers often use case studies to illustrate general principles to other researchers and to students.

  31. Case Studies • There are at least two important limitations of case studies. • First, they are virtually useless in providing evidence to test behavioral theories or treatments. The lives and events studied occur in uncontrolled fashion and without comparison information. No matter how reasonable the investigator’s explanations, alternative explanations cannot be ruled out.

  32. Case Studies • Second, most case studies rely on the observations of a single investigator. Thus, we often have no way of assessing the reliability or validity of the researcher’s observations or interpretations. • Because the researcher may have a vested interest in the outcome of the study (e.g., whether a therapy works), one must always be concerned about self-fulfillingprophecies and demand characteristics.

  33. Surveys • The survey looks at many cases in less depth and asks people to report their behavior or opinions. Asking questions is tricky because even subtle changes in the order or wording of questions can dramatically affect responses. •  A limitation: what people say and what they do are often two very different things.

  34. Bias • We are vulnerable to the false consensus effect, whereby we overestimate others’ agreement with us. • The survey ascertains the self-reported attitudes or behaviors of a population by questioning a representative, random sample.

  35. Representative Sample • Obtaining a representative sample of even a well-defined population may not be easy. • Who has a phone • Who will actually vote • Who is on what list • Time of day call is made • How many surveys sent vs. how many returned • Compared to what!!!!!!!!! (e.g., recommended by more than 75% of dentists)

  36. Naturalistic Observation • Consists of observing and recording the behavior of organisms in their natural environment. • Like the case study and survey methods, this research strategy describes behavior but does not explain it.

  37. Correlations • When surveys and naturalistic observations reveal that one trait or behavior accompanies another, we say the two correlate. • A correlation coefficient is a statistical measure of relationship. • a positive correlation indicates a direct relationship, meaning that two things increase together or decrease together. • a negative correlation indicates an inverse relationship: As one thing increases, the other decreases.

  38. Correlations • The tendency to interpret correlations in terms of cause and effect is a common error.

  39. Correlations • Hippocrates’ delightful Good News Survey (GNS) was designed to illustrate errors that can be hidden in seemingly sound scientific studies. • The survey found that people who often ate Frosted Flakes as children had half the cancer rate of those who never ate the cereal. • Conversely, those who often ate oatmeal as children were four times more likely to develop cancer than those who did not. • Does this mean that Frosted Flakes prevents cancer while oatmeal causes it?

  40. Correlations • What are the explanations for these correlations. The answer? • Cancer tends to be a disease of later life. Those who ate Frosted Flakes are younger. In fact, the cereal was not around when older respondents were children, and so they are much more likely to have eaten oatmeal.

  41. Correlations • Scientists have linked television-watching with childhood obesity. In fact, the degree of obesity rises 2 percent for each hour of television viewed per week by those aged 12 to 17, according to a study in the Journal of the American Academy of Pediatrics. • One explanation is that TV watching results in less exercise and more snacking (often on the high-calorie, low-nutrition foods pitched in commercials). Is that conclusion justified?

  42. Correlations • What are some alternative explanations for the correlation? • The causal relationship may be reversed. Obesity may lead children to prefer more sedentary activities, such as TV viewing. • Or, some third factor may explain the relationship. For example, parents having little formal education may not emphasize good nutrition or good use of leisure time.

  43. Correlations Misinterpreting Correlations: • Keith Stanovich has identified two major classes of ambiguity in correlational research: the “directionality problem” and the “third variable possibility.” • Directionality Problem: Researchers have long known about the correlation between eye-movement patterns and reading ability: Poorer readers have more erratic patterns (moving the eyes from right to left and making more stops) per line of text.

  44. Correlations directionality problem: • In the past, however, some educators concluded that “deficient oculomotor skills” caused reading problems and so developed “eye-movement training” programs as a corrective. Many school districts may still have “eye-movement trainers,” representing thousands of dollars of equipment, gathering dust in their storage basements.

  45. Correlations directionality problem: • Careful research has indicated that the eye movement/reading ability correlation reflects a causal relationship that runs in the opposite direction. • Slow word recognition and comprehension difficulty lead to erratic eye movements. • When children are taught to recognize words efficiently and to comprehend better, their eye movements become smoother. • Training children’s eye movements does nothing to enhance their reading comprehension.

  46. Correlations Third variable possibility: • Basically, a third variable account for the problem. E.g., an unexpected virus. • Poor people living in an area with poor sanitation contract a serious disease. After more research, however, the cause was found to be related to an inadequate diet- nothing at all to do with the sanitary conditions.

  47. Correlation Vs. Casuation • Perhaps the most irresistible thinking error is to assume that correlation proves causation. • Correlation reveals how closely two things vary together and thus how well one predicts the other. • However, the fact that events are correlated does not mean that one causes the other. • Thus, while correlation enables prediction, it does not provide explanation.

  48. Correlations Exercise

  49. Scatter Plots • Researchers depict scores on graphs called scatterplots; each point plots the value of two variables. • The correlation coefficient helps us to see the world more clearly by revealing the extent to which two things relate.