Presentation on theme: "Psychology as a Science: The Importance of Research."— Presentation transcript:
Psychology as a Science: The Importance of Research
3 Impression of Psychology With hopes of satisfying curiosity, many people listen to talk-radio counselors and psychics to learn about others and themselves. Dr. Crane (radio-shrink) http://www.nbc.com http://www.photovault.com Psychic (Ball gazing)
4 Why Do Psychology? 1.How can we differentiate between uniformed opinions and examined conclusions? 2.The science of psychology helps make these examined conclusions, which leads to our understanding of how people feel, think, and act as they do!
Limits of Human Intuition and Overconfidence Activity Math Problem Overconfidence Activity 5
6 ACTIVITY Need ten volunteers You will be instructed to lie or tell the truth. Be sure your response is detailed and believable. Determine if the student is lying or telling the truth. Rate your degree of confidence 50% = fifty-fifty chance 100% = absolutely certain
7 Overconfidence Sometimes we think we know more than we actually know. Anagram BARGEGRABE ENTRYETYRN WATERWREAT How long do you think it would take to unscramble these anagrams? People said it would take about 10 seconds, yet on average they took about 3 minutes (Goranson, 1978).
8 What About Intuition & Common Sense? Many people believe that intuition and common sense are enough to bring forth answers regarding human nature. Intuition and common sense may aid queries, but they are not free of error.
9 Limits of Intuition Personal interviewers may rely too much on their “gut feelings” when meeting with job applicants. Taxi/ Getty Images
11 Hindsight Bias is the “I-knew-it-all-along” phenomenon. After learning the outcome of an event, many people believe they could have predicted that very outcome. We only knew the stock market would plummet after it actually did plummet. Video: Understanding Research Hindsight Bias
12 The Scientific Attitude The scientific attitude is composed of curiosity (passion for exploration), skepticism (doubting and questioning) and humility (ability to accept responsibility when wrong).
13 Critical Thinking Critical thinking does not accept arguments and conclusions blindly. It examines assumptions, discerns hidden values, evaluates evidence and assesses conclusions. The Amazing Randi Courtesy of the James Randi Education Foundation
14 How Do Psychologists Ask & Answer Questions? Psychologists, like all scientists, use the scientific method to construct theories that organize, summarize and simplify observations.
15 A theory is an explanation that integrates principles and organizes and predicts behavior or events. For example, low self-esteem contributes to depression. Theory
16 A hypothesis is a testable prediction, often prompted by a theory, to enable us to accept, reject or revise the theory. People with low self-esteem are apt to feel more depressed. (not an educated guess) Hypothesis
17 Research would require us to administer tests of self-esteem and depression. Individuals who score low on a self-esteem test and high on a depression test would confirm our hypothesis. Research Observations
18 Research Process
19 OPERATIONAL DEFINITIONS Operational definitions reduce experimenter bias and allow for replication (repeating results) An operational definition of a variable is observable and measurable. How could self-esteem be observed and measured? Activity: operationally define the underlined term.
20 Operational Definitions: 1.The teacher wants to find a way to help make Billy act more friendly toward other children. 2.A psychologist wants to know if the new form of psychotherapy will make people less depressed. 3.Does this drug help people overcome tiredness? 4.Boys show more affection for their fathers than their mothers. 5.People dream more if they have a big meal before going to sleep. 6. College athletes are not as smart as regular students.
21 ADDITIONAL PRACTICE OPERATIONAL DEFINITIONS Remember, you need to be able to observe and measure the variable: – Happiness – Fear – Conscientiousness
22 Description Case Study A technique in which one person, group, or situation is studied in depth to reveal underlying behavioral principles. Is language uniquely human? Susan Kuklin/ Photo Researchers
23 CASE STUDY Often used in clinical work. Can include tests, interviews, analysis of letters, or transcripts. Example: Phineas Gage
24 Survey A technique for ascertaining the self-reported attitudes, opinions or behaviors of people usually done by questioning a representative, random sample of people. http://www.lynnefeatherstone.org
25 Survey Random Sampling If each member of a population (the larger group the hypothesis applies to) has an equal chance of inclusion into a sample, it is called a random sample (unbiased). It will be representative of the population. If the survey sample is biased, its results are not valid. The fastest way to know about the marble color ratio is to blindly transfer a few into a smaller jar and count them.
27 Survey Wording can change the results of a survey. Q: Should cigarette ads and pornography not be allowed on television? (not allowed vs. forbid) Wording Effects
28 WORDING EFFECTS Women with young children should be able to work outside the home. – 8 in 10 Americans agreed
29 WORDING EFFECTS Women should stay at home if they have young preschool children. – 7 in 10 Americans agreed
30 SURVEY People may be reluctant to admit undesirable or embarrassing things about themselves Or they may say what they think they should say. Examples?
31 FALSE CONSENSUS EFFECT A tendency to overestimate the extent to which others share our beliefs and behaviors. Example?
32 Naturalistic Observation Observing and recording the behavior of animals in the wild and recording self-seating patterns in a multiracial school lunch room constitute naturalistic observation. Courtesy of Gilda Morelli
34 NATURALISTIC OBSERVATION What problems did you encounter while doing the naturalistic observation? What were the advantages of doing this type of research? How would you describe your results? What can we conclude from the data? Can we assume causation from this data? Why or why not?
35 Descriptive Methods Case studies, surveys, and naturalistic observation describe behaviors. They are correlational types of research rather than experimental. Summary
36 CORRELATION Correlation shows a relationship between variables. It is measured by the correlation coefficient. The extent to which two factors vary together determines how well either factor predicts the other
37 Correlation When one trait or behavior accompanies another, we say the two correlate. Correlation coefficient Indicates direction of relationship (positive or negative) Indicates strength of relationship (0.00 to 1.00) r = 0.37 + Correlation Coefficient is a statistical measure of the relationship between two variables.
38 CORRELATION Positive correlation: a direct relationship; two variables increase or decrease together Negative correlation: an inverse relationship; as one thing increases, the other decreases. It would be very rare in Psychology to have a perfect (1.00) correlation
Guys – if you want keep your hair, don’t get married Among men, the number of years they are married positively correlates to baldness So… marriage causes baldness in men, right? 40
41 or Correlation does not mean causation!!!
42 Correlation Practice Which relationship is stronger? +.6 or -.7 Complete PsychSim Activity
43 Illusory Correlation The perception of a relationship where no relationship actually exists. When we believe there is a relationship we are likely to notice and recall instances that confirm our belief. Parents conceive children after adoption. Confirming evidence Disconfirming evidence Do not adopt Disconfirming evidence Confirming evidence Adopt Do not conceive Conceive Michael Newman Jr./ Photo Edit
44 Given random data, we look for order and meaningful patterns. Order in Random Events Your chances of being dealt either of these hands is precisely the same: 1 in 2,598,960.
45 Order in Random Events Given large numbers of random outcomes, a few are likely to express order. Angelo and Maria Gallina won two California lottery games on the same day. Jerry Telfer/ San Francisco Chronicle
46 Experimentation Like other sciences, experimentation is the backbone of psychological research. Experiments isolate causes and their effects. Reaction Time Experiment Exploring Cause and Effect
47 Many factors influence our behavior. Experiments (1) manipulate factors that interest us, while other factors are kept under (2) control. Effects generated by manipulated factors isolate cause and effect relationships. Exploring Cause & Effect
48 An independent variable is a factor manipulated by the experimenter. The effect of the independent variable is the focus of the study. For example, when examining the effects of breast feeding upon intelligence, breast feeding is the independent variable. Independent Variable
49 A dependent variable is a factor that may change in response to an independent variable. In psychology, it is usually a behavior or a mental process. For example, in our study on the effect of breast feeding upon intelligence, intelligence is the dependent variable. Dependent Variable
50 Experimentation A summary of steps during experimentation.
51 INDEPENDENT AND DEPENDENT VARIABLES What (IV) affects what (DV)? Practice exercises.
52 CONTROLING OTHER VARIABLES An experiment has at least two different conditions: control condition experimental condition Random assignment of subjects between conditions equates the conditions (basketball example)
53 CONFOUNDING AND RANDOM VARIABLES Confounding (uncontrolled factors that might have affected the dependent variable and confused interpretation of the experimental data) Random variables (uncontrolled factors such as differences in subjects' backgrounds, personalities, health, and so on that might confound research results) These need to be eliminated when possible. Why? Random assignment is presumed to distribute impact of uncontrolled variables randomly and probably equally across groups.
54 OTHER METHODS OF CONTROL Eliminating order effects Matching conditions to eliminate confounding variables Double blind Eliminate experimenter bias – Experimenter expectancies – Confirmation bias
55 Population Representative Sample ( larger the better) Experimental Group Control Group Apply Methods of control Apply methods of control Independent Variable Placebo Measure Dependent Variable Is the difference statistically significant? Random Assignment Everyone has equal chance. Random Sampling (aka Random Selection) This is the goal! EXPERIMENTAL DESIGN =
56 EXPERIMENTATION Population (group you are generalizing your hypothesis to) Random sample from the population Random sample creates a representative sample rather than a biased sample Random assignment of subjects to experimental group or control group
57 EXPERIMENTATION Experimental group gets the independent variable Control group gets the placebo Be sure all measures of control are in place so the only thing influencing the results (dependent variable) is the independent variable
58 EXPERIMENTATION Measure the dependent variable (you can do this because of operational definitions) Compare the results between the experimental group and the control group using inferential statistics. Is there a statistically significant difference (greater than 1 in 20 =.05)? If so, you have established a causal relationship.
59 ETHICAL PRINCIPLES Established by the American Psychological Association – Obtain informed consent of potential participants – Protect subjects from harm and discomfort – Treat information about subjects confidentially – Fully explain the research afterward (debrief) – Institutional Review Boards should screen research proposals
60 EXPERIMENTAL DESIGN ASSIGNMENT
61 Complete Practice Exams in Study Guide – Chapter One, Answers begin p. 20 Progress Test One, p. 8, #’s 1-20 Progress Test Two, p. 11, #’s 1 -20 Thinking Critically, p. 13 #’s 1-20 – Chapter Twelve, Answers begin p. 361 Progress Test One, p. 348, # 2-6, 15, and Matching Items Progress Test Two, p. 350, # 2, 7, 10 and Matching Items Thinking Critically, p. 353, #’s 1-5, 7-8, 11
62 Comparison Below is a comparison of different research methods.
63 FAQ Q1. Can laboratory experiments illuminate everyday life? Ans: Artificial laboratory conditions are created to study behavior in simplistic terms. The goal is to find underlying principles that govern behavior.
64 FAQ Q2. Does behavior depend on one’s culture and gender? Ans: Even when specific attitudes and behaviors vary across cultures, as they often do, the underlying processes are much the same. Biology determines our sex, and culture further bends the genders. However, in many ways woman and man are similarly human. Ami Vitale/ Getty Images
66 FAQ Q4. Is it ethical to experiment on people? Ans: Yes. Experiments that do not involve any kind of physical or psychological harm beyond normal levels encountered in daily life may be carried out.
68 FAQ Q6. Is psychology potentially dangerous? Ans: It can be, but it is not. The purpose of psychology is to help humanity with problems such as war, hunger, prejudice, crime, family dysfunction, etc.
69 Survey: What you are about to read, including chapter outlines and section heads. Question: Ask questions. Make notes. Read: Look for the answer to your questions by reading a manageable amount at a time. Rehearse: Recall what you’ve read in your own words. Test yourself with quizzes. Review: What you learn. Read over notes and quickly review the whole chapter. Tips for Studying Psychology Psychology can teach you how to ask and answer important questions. Survey, Question, Read, Rehearse and Review (SQ3R)
70 Distribute your time. Learn to think critically. Listen actively in class. Overlearn. Be a smart test-taker. Tips for Studying Psychology Additional Study Hints
Overconfidence Activity 1)I feel 98 percent certain that the area of the U.S. is more than ____ square miles but less than ____ square miles. 2)I feel 98 percent certain that in 2010 the population of the US was more than ___ but less than ____. 3)I feel 98 percent certain that the number of dogs in America is more than ___ but less than ___. 71
Overconfidence Activity 4)I feel 98 percent certain that in 2012 the number of female engineers in the United States was more than ___ % of all engineers but less than ___%. 5)I feel 98 percent certain that in 2011 the number of Starbucks in the US was more than___ but less than ___. 72