Skeptic » eSkeptic » August 19, 2015

The Skeptics Society & Skeptic magazine



Edwina Rogers
A Conservative Skeptic
SKEPTICALITY EPISODE 258

In this episode of Skepticality, Derek brings another interview from his trip to The Amazing Meeting 13: a discussion with Edwina Rogers. Edwina is currently the CEO for the Secular Policy Institute where she is helping bring more critical thought into the halls of American Government. Find out more about how a conservative from rural Alabama came to be such a major champion for science and critical thinking.

Skepticality (the Official Podcast App of Skeptic Magazine) is available on the App Store
Skepticality (the Official Podcast App of Skeptic Magazine) is available at Amazon for Android
Skepticality (the Official Podcast App of Skeptic Magazine) is available on Windows Store

The Latest Episode of Mr. Deity: Mr Deity and the Sting

Mr. Deity commissions a former pastor to infiltrate big Atheism.

WATCH | DONATE | SUPPORT | FOLLOW | EXPLORE | RENT


About this week’s eSkeptic

In this week’s eSkeptic, Harriet Hall reviews The Myth of Mirror Neurons: The Real Neuroscience of Communication and Cognition, by Gregory Hickok. This review first appeared on the Science-Based Medicine Blog and also in Skeptic magazine 20.2 (2015).

Harriet Hall is a retired family physician and Air Force Colonel living in Puyallup, WA. 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 is author of Women Aren’t Supposed to Fly: The Memoirs of a Female Flight Surgeon. Her website is www.skepdoc.info.

The Use and Abuse of Mirror Neurons

a book review by Harriet Hall, M.D.

I couldn’t say it any better than Steven Pinker did on the jacket blurb of this important book:

Every now and again an idea from science escapes from the lab and takes on a life of its own as an explanation for all mysteries, a validation of our deepest yearnings, and irresistible bait for journalists and humanities scholars… Hickok puts an end to this monkey business by showing that mirror neurons do not, in fact, explain language, empathy, society, and world peace. But this is not a negative exposé—the reader of this book will learn a great deal of the contemporary sciences of language, mind, and brain, and will find that the reality is more exciting than the mythology.

Mirror neurons were discovered serendipitously during a study of macaque monkeys where researchers were recording the activity of individual brain cells. They found single cells that fired when the monkey grasped an object. Then they happened to notice something they hadn’t expected: the cells also fired as the monkey observed the experimenter grasping an object to set up the next trial.

In all, they recorded data from 184 neurons in the F5 motor area of the brain. Almost all of them fired when the monkey performed some kind of action, just as would be expected from cells in the motor cortex. But 87 of these also responded to some type of visual stimuli: 48 responded to seeing objects and 39 responded to seeing actions; of these, 12 neurons responded most strongly when the monkey grasped an object and also when it observed the researcher performing the same action.

The initial interpretation of the scientists: one of the functions of that part of the brain is to retrieve appropriate motor acts in response to sensory stimuli. Monkeys have rich social interactions, so it makes sense that the brain has a mechanism for communicating information about perceived actions of others to motor areas that code self-actions for execution. So far, so good. But they went on to suggest that their findings might have implications for two areas of human research that seemed to show a similar observation/execution correspondence:

Limb apraxia, where patients unable to perform an action had been reported to have deficits in understanding the limb gestures of others.

The motor theory of speech perception, the idea that we perceive speech by reconstructing the motor gestures that generated those sounds.

Hickok suggests that the experimental setup had trained the monkeys to associate their own grasp with a reward, and to associate the grasp of the researcher with an upcoming new reward. What the researchers had observed might be merely a reflection of how the brain stores, organizes, and retrieves memories and learned motor patterns. They could have been seeing a generalized phenomenon of association rather than anything mirror-like. If so, the association process itself would be a more promising area for further research.

The findings in monkeys were replicated in other primates but not in humans. Researchers assumed that humans also had a mirror neuron system, but that assumption is supported only by indirect evidence from transcranial magnetic stimulation studies, PET scans, and the observation that patients with damage to Broca’s area had pantomime recognition defects. Hickok points out that those findings are not enough to prove that humans have mirror neurons, and that they might well have non-mirror explanations.

Speculation soon ran amok and mirror neurons became wildly popular. Hickok says the idea was seductive because of three factors:

  1. You could explain it in one line: “We understand action because the motor representation of that action is activated in our brain.”
  2. It promised to bring this simplicity of explanation to many complex problems.
  3. It was grounded in hardcore animal neurophysiology, providing a neural mechanism for human cognition and revealing an evolutionary pathway.

Mirror neuron research studies proliferated. Mirror neurons were soon implicated in everything from contagious yawning to autism. Hickok lists 37 areas of mirror neuron research and provides citations. I won’t copy the whole list, but it includes schizophrenia, sexual orientation, cigarette smoking, political attitudes, felt presence, the degree of male erection, spectator sport appreciation, drug abuse, and “misattribution of anger in the music of avant-garde jazz saxophonists.” It’s an astonishing body of speculation to have developed from an interpretation of those 12 original macaque neurons, an interpretation that Hickok thinks was probably wrong.

He describes a number of anomalies that are inconsistent with mirror neuron theory. You’ll have to read the book for the details, but I’ll just mention one of his points that made me laugh. When a man sees someone kicking another man in the balls, it doesn’t prompt him to mirror the kicking behavior; it prompts him to display a very different behavior, to cringe and protect his own groin. Hickok acknowledges that anomalies don’t necessarily prove a theory wrong, but in this case the sheer number of anomalies is cause for concern and should lead us to explore alternative explanations.

Skeptic magazine 20.2 (cover)

This article appeared in this issue of Skeptic magazine. Order the issue.

To give one example, mirror neurons seemed to provide a convenient explanation for autism. Autistics appear to lack the ability to understand the goals and intentions of others, to read their emotions, to empathize, and to share attention with others. It is said that they lack a “theory of mind” because of a deficit in mirror neurons. But there is really no good evidence that mirror neurons have anything to do with these abilities, and autistics don’t behave as the mirror theory would predict. There is a false-belief test where children are asked to predict where another person will look for an object when only the child knows it has been moved. Young children who can’t pass the false-belief test lack the ability to understand what is going on in another person’s mind, but they don’t behave as if they are autistic.

Hickok favors another hypothesis: that autism is not a matter of deficits at all, but of hypersensitivity to sensory inputs. This concept has been called “the intense world syndrome.” Maybe they don’t pay attention to human faces because it is painful for them to be flooded with the associated emotional sensations. Maybe the repetitive behaviors, fixations, and other features of autism are protective measures to numb them against the onslaught of overwhelming sensory input. This tallies with Temple Grandin’s “squeeze box” she invented to calm her when she felt anxious and overstimulated. Instead of claiming that he understands autism, Hickok merely proposes a hypothesis for investigation. Perhaps the best thing in the book is this sentence: “I remain a skeptic, even of my own ideas.” The words of a true scientist!

The case of autism brings up a point that applies across the board: we must be careful when making inferences about behavior. If an autistic person doesn’t appear to recognize emotions in others, that doesn’t necessarily mean that he can’t recognize them. We can observe a behavior, but we shouldn’t be hasty about assuming we know why the behavior occurs. If a person doesn’t drink milk, we might infer that he doesn’t like it; but it might be that he loves milk but is lactose intolerant. Similarly, when a part of the brain lights up on a PET scan, it indicates increased metabolic activity, but the neurons might be more active because they are working to suppress a response rather than to augment it. Hickok shows in detail how the research on mirror neurons may have gone astray because of false assumptions and jumping to unwarranted conclusions.

The Myth of Mirror Neurons is a fascinating, game-changing book. It explains the details of research studies and its reasoning is thoroughly backed up by citations from the scientific literature. It is not an easy read; some of the concepts are hard to grasp at first, especially for those not familiar with the relevant literature and the terminology. But it offers a valuable lesson in how scientists can be led down the wrong path and how errors can be compounded. It shows how important it is to make sure research data justify the conclusions, to search rigorously for disconfirming evidence, and to make sure alternative explanations have been considered and adequately ruled out. The book accomplishes two goals: it sheds serious doubt on almost everything that has been written about mirror neurons, and it describes cutting edge neuroscience research that may eventually lead us to a better understanding of how communication and cognition really work. No real answers, but plenty of questions. And after all, one of the most important things in science is knowing which questions to ask. END

Rent Gregory Hickok’s lecture on Vimeo On Demand
2 Comments »

2 Comments

  1. Miles R. says:

    “When a man sees someone kicking another man in the balls, it doesn’t prompt him to mirror the kicking behavior; it prompts him to display a very different behavior, to cringe and protect his own groin.”

    I hope that this finding was obtained by having subjects watch the *Ow, My Balls!* sequence in *Idiocracy*.

  2. Roy Niles says:

    It seems to me that to throw out the mirroring aspects of neurons is to throw out, or perhaps to never have thrown in, the realization that neurons are the carriers of intelligence, and biological intelligence DOES have the strategic perception of other entities’ intelligent purposes as one of its own intelligent goals
    Neurons are not mechanistic thinkers. They don’t think at all. They are used by our thinking processes as conductors of meaningful communication. And if you “think” that different individuals don’t meaningfully communicate at a distance, you’re not trying to correct your thinking error there.

Get eSkeptic

Science in your inbox every Wednesday!

eSkeptic delivers great articles, videos, podcasts, reviews, event announcements, and more to your inbox once a week.

Sign me up!

Donate to Skeptic

Please support the work of the Skeptics Society. Make the world a more rational place and help us defend the role of science in society.

Detecting Baloney

Baloney Detection Kit Sandwich (Infographic) by Deanna and Skylar (High Tech High Media Arts, San Diego, CA)

The Baloney Detection Kit Sandwich (Infographic)

For a class project, a pair of 11th grade physics students created the infographic shown below, inspired by Michael Shermer’s Baloney Detection Kit: a 16-page booklet designed to hone your critical thinking skills.

FREE Video Series

Science Based Medicine vs. Alternative Medicine

Science Based Medicine vs. Alternative Medicine

Understanding the difference could save your life! In this superb 10-part video lecture series, Harriet Hall, M.D., contrasts science-based medicine with so-called “complementary and alternative” methods. The lectures each range from 32 to 45 minutes.

FREE PDF Download

Top 10 Myths of Terrorism

Is Terrorism an Existential Threat?

This free booklet reveals 10 myths that explain why terrorism is not a threat to our way of life or our survival.

FREE PDF Download

The Top 10 Weirdest Things

The Top Ten Strangest Beliefs

Michael Shermer has compiled a list of the top 10 strangest beliefs that he has encountered in his quarter century as a professional skeptic.

FREE PDF Download

Reality Check: How Science Deniers Threaten Our Future (paperback cover)

Who believes them? Why? How can you tell if they’re true?

What is a conspiracy theory, why do people believe in them, and why do they tend to proliferate? Why does belief in one conspiracy correlate to belief in others? What are the triggers of belief, and how does group identity factor into it? How can one tell the difference between a true conspiracy and a false one?

FREE PDF Download

The Science Behind Why People See Ghosts

The Science Behind Why People See Ghosts

Do you know someone who has had a mind altering experience? If so, you know how compelling they can be. They are one of the foundations of widespread belief in the paranormal. But as skeptics are well aware, accepting them as reality can be dangerous…

FREE PDF Download

Top 10 Myths About Evolution

Top 10 Myths About Evolution (and how we know it really happened)

If humans came from apes, why aren’t apes evolving into humans? Find out in this pamphlet!

FREE PDF Download

Learn to be a Psychic in 10 Easy Lessons

Learn to do Psychic “Cold Reading” in 10
Easy Lessons

Psychic readings and fortunetelling are an ancient art — a combination of acting and psychological manipulation.

Copyright © 1992–2017. All rights reserved. The Skeptics Society | P.O. Box 338 | Altadena, CA, 91001 | 1-626-794-3119. Privacy Policy.