This post comes from a website that you can subscribe to by clicking on www.skeptic.com/eskeptic/signup. I have reproduced it unchanged as I feel it is well written and deserves a wider audience. I guarantee that by the time you have finished reading this post you will have changed your mind about quite a few things!
In this week’s eSkeptic, Dr Harriet Hall, MD, (aka the Skepdoc) reviews 50 Great Myths of Popular Psychology: Shattering Widespread Misconceptions about Human Behavior by Scott O. Lilienfeld, Steven Jay Lynn, John Ruscio, and Barry L. Beyerstein.
Dr Harriet Hall, MD is a retired family physician and Air Force Colonel living in Puyallup, Washington. She writes about alternative medicine, pseudoscience, quackery, and critical thinking. She is a contributing editor to both Skeptic and Skeptical Inquirer, an advisor to the Quackwatch website, and an editor of ScienceBasedMedicine.org, where she writes an article every Tuesday. She recently published Women Aren’t Supposed to Fly: The Memoirs of a Female Flight Surgeon. Her website is www.skepdoc.info.
The Mythbusters of Psychology
a book review by Dr. Harriet Hall, MD
KARL POPPER WROTE: “SCIENCE MUST BEGIN WITH MYTHS and with the criticism of myths.” Popular psychology is a prolific source of myths. It has produced widely held beliefs that “everyone knows are true” but that are contradicted by psychological research. A new book does an excellent job of mythbusting: 50 Great Myths of Popular Psychology by Scott O. Lilienfeld, Steven Jay Lynn, John Ruscio, and the late, great skeptic Barry L. Beyerstein.
I read a lot of psychology and skeptical literature, and I thought I knew a lot about false beliefs in psychology, but I wasn’t as savvy as I thought. Some of these myths I knew were myths, and the book reinforced my convictions with new evidence that I hadn’t seen; some I had questioned and I was glad to see my skepticism vindicated; but some myths I had swallowed whole and the book’s carefully presented evidence made me change my mind.
The authors start with a chapter explaining how myths and misconceptions arise.
- Word of mouth. If we hear something repeated enough times, we tend to believe it.
- Desire for easy answers and quick fixes.
- Selective perception and memory. We remember our hits and forget our misses.
- Inferring causation from correlation.
- Post hoc, ergo propter hoc reasoning.
- Exposure to a biased sample. Psychologists overestimate the difficulty of stopping smoking because they only see patients who come to them for help, not the many who stop on their own.
- Reasoning by representativeness — evaluating the similarity between two things on the basis of superficial resemblance.
- Misleading film and media portrayals.
- Exaggeration of a kernel of truth.
- Terminological confusion. Because of the etymology of the word schizophrenia, many people confuse it with multiple personality disorder.
The authors discuss our susceptibility to optical illusions and other cognitive illusions, our propensity to see patterns where they don’t exist, the unreliability of intuition, and the fact that common sense frequently misleads us. They characterize science as “uncommon sense” — it requires us to set aside our common sense preconceptions when evaluating evidence. They cover 50 myths in depth, explaining their origins, why people believe them, and what the published research has to say about the claims. Everything is meticulously documented with sources listed. Here’s a sample of the myths they cover:
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- Criminal profiling is helpful in solving cases. In most studies, professional profilers barely do better than untrained persons. Most of what they say can be inferred from “base rate information” about criminals: guessing that a serial killer is a white male will be right more than 2/3 of the time just based on statistics.
- A large proportion of criminals successfully use the insanity defense. The insanity defense is raised in less than 1% of criminal trials and is successful only about 25% of the time.
- If you’re unsure of your answer when taking a test, it’s best to stick with your initial hunch. Darn! I wonder how many questions I got wrong over the years because I believed that. 60 studies have consistently shown that students are more likely to change a wrong answer to a right one than vice versa, and students who change more answers tend to get higher test scores.
- Students learn best when teaching styles are matched to their learning styles. This turns out to be an urban legend not supported by any acceptable evidence. It could backfire because students need to correct and compensate for their shortcomings, not avoid them. The authors cite a satirical story from The Onion about nasal learners demanding an odour-based curriculum.
- It’s better to express anger to others than to hold it in. The evidence shows that expressing anger only reinforces it and leads to more aggression.
- Men and women communicate in completely different ways. There are differences, but they are very slight, probably not enough to be meaningful, and definitely not enough to suggest that they are from different planets as claimed in the book Men are from Mars, Women are from Venus. Women don’t talk more than men: a study of college students carrying recorders showed that both sexes talked about 16,000 words a day.
- A positive attitude can stave off cancer. Not only does the evidence not support this claim, but there is evidence that women who were highly stressed were less likely to develop breast cancer. And attitudes don’t prolong survival: even the most optimistic cancer patients lived no longer than the most fatalistic ones.
- Memory is like a tape recorder.
- Memories of traumatic experiences are commonly repressed.
- Subliminal advertising is effective.
- Some people are left-brained, others are right-brained.
- Playing Mozart’s music to infants boosts their IQ.
- When dying, people pass through a universal series of psychological stages.
- Hypnosis is useful for retrieving memories.
- The polygraph can detect lies.
- Low self-esteem is a major cause of psychological problems.
- Only deeply depressed people commit suicide.
- Abstinence is the only realistic treatment goal for alcoholics.
- Childhood sexual abuse usually leads to adult psychopathology.
The authors also list a total of 250 other myths in a brief “Fiction/Fact” format with suggested resources for further reading. Some of these facts intrigued me. Dreams occur in non-REM sleep as well as during REM sleep. Transcendental meditation yields no greater effects than rest or relaxation alone. Most women don’t have worse moods in the premenstrual period. Women are no better than men at guessing the feelings of others. Sexual content of ads may make people pay more attention, but they are less likely to remember the product’s brand name. There’s little or no evidence for the G-spot. Men don’t think about sex every 7 seconds — somebody just made that up. Individual efforts produce better quality ideas than group brainstorming sessions.
If you read this book, you may be challenged to give up some of your cherished beliefs. Some people find it painful to admit that they were wrong. I find it one of the greatest pleasures of skeptical inquiry and science. When I change my mind about something I don’t chastise myself for the original error; I congratulate myself for having learned better and for having achieved a better grasp on reality.
The proper stance of a skeptic or scientist is to defer judgment pending evidence. In practice, that isn’t always possible. We can’t take the time to thoroughly investigate everything we hear. It is reasonable to provisionally accept something that everyone says is true, that is compatible with common sense, that is plausible, and that is often based on some preliminary evidence. As long as we keep in mind that these claims may be based on inadequate evidence and we remain ready to change our minds when better evidence arrives.
We’re all susceptible to this kind of error. The authors of this book fell for one myth themselves. In a short mention of medical myths they included this one: “eating too many carrots makes our skin turn orange.” Apparently they had read it on more than one list of medical myths. I wrote the lead author to tell him this was not a myth, but a recognized condition called carotenemia. It looks just like jaundice except that the whites of the eyes are spared. I had a patient with that condition, caused by eating lots of carrots on a weight-loss diet. She had bright red hair and with her bright yellow skin she looked like something out of a comic book — sort of like an anti-Smurf. It was very impressive. As a good scientist, Dr. Lilienfeld accepted the evidence and promised to amend the statement in subsequent editions.
Apart from carrots, I found nothing to criticize in this book. The authors have done us a great service by compiling all this information in a handy, accessible form, by showing how science trumps common knowledge and common sense, and by teaching us how to question and think about what we hear. I highly recommend it.