Cover Image: September 2012 Scientific American Magazine See Inside

Illusory Faces Peer Out of Unlikely Places

When seeing is believing














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God Save the Queen

Canadian banknotes issued in 1954 featured a portrait of British monarch Elizabeth II. The young queen looked majestic and serene, despite the grinning demon tucked in the curls behind her regal ear (colored red, to make it easier to see). Talk about having a royally bad hair day! Canadians were understandably appalled by what became known as the “Devil's head” or “Devil's face” series. In 1956 the Bank of Canada ordered banknote companies to darken the highlights in the queen's hair, effectively exorcising the King of Hell from Canadian currency.

Holy Toast

A brain region called the fusiform gyrus is responsible for our extraordinary face-detection abilities. Neurons in this area are so exquisitely attuned to sense faces in the environment that they often signal false positive results in the presence of sparse information, such as when we “see” faces in clouds, in wallpaper patterns, the front of cars or food items.

Diane Duyse of Florida had taken a small bite out of a grilled-cheese sandwich when she noticed an image burned into the bread. “I saw this lady looking back at me,” she said. Ten years later the sandwich, said to bear an image of the Virgin Mary, sold on eBay for $28,000. Pareidolia can be lucrative.

Eye of the Tiger

Neurologists Péricles Maranhão-Filho and Maurice B. Vincent of the Federal University of Rio de Janeiro advocate the use of face-detection illusions as heuristics to help doctors diagnose neurological diseases. One is PKAN, or pantothenate kinase–associated neurodegenerative disease, which results from mutations in the genes encoding the enzyme responsible for the biosynthesis of coenzyme A. Typically PKAN starts during childhood, and most patients lose the ability to walk within 15 years. The brains of PKAN patients show decreased intensity of the globus pallidus (involved in motor control) from iron accumulation, with a central area of increased intensity from necrosis. The image looks decidedly feline, providing the so-called eye-of-the-tiger sign.

The “Ow! My Balls!” Illusion

Medical imaging is a new fertile ground for pareidolia. Urologists G. Gregory Roberts and Naji J. Touma of Queen's University in Ontario were shocked to discover a face, contorted in agony, in the scrotal ultrasound images (left) of a 45-year-old man afflicted with severe testicular pain. The doctors toyed with the idea that the image might be a manifestation of Min, the Egyptian god of male virility, but ultimately deemed the facial features in the benign mass accidental.

The brain's capacity to establish false links among things that are not actually connected is essential to the “paranoiac-critical method” artistic technique invented by Spanish surrealistic painter Salvador Dalí. (Paranoia and pareidolia have the same etymology, from the Greek para- for “instead of” and -oid, -oeides or -eidos for “form.”) In Dalí's Slave Market with the Disappearing Bust of Voltaire, several features in Voltaire's face are formed by the bodies of people in the scene (below).

Dartmouth College neuroscientist Ming Meng and his colleagues recently imaged the brains of observers while they viewed faces and objects that looked like faces. The left fusiform gyrus was activated by both faces and objects resembling them, whereas the right fusiform gyrus showed much stronger activation to actual faces than to look-alikes.


This article was originally published with the title A Faithful Resemblance.



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ABOUT THE AUTHOR(S)

SUSANA MARTINEZ-CONDE and STEPHEN L. MACKNIK are laboratory directors at the Barrow Neurological Institute in Phoenix. They serve on Scientific American Mind's board of advisers and are authors of Sleights of Mind: What the Neuroscience of Magic Reveals about Our Everyday Deceptions, with Sandra Blakeslee, now in paperback (http://sleightsofmind.com). Their forthcoming book, Champions of Illusion, will be published by Scientific American/Farrar, Straus and Giroux.


(Further Reading)

Was There Satan's Face in the World Trade Center Fire? A Geometric Analysis. V. Kreinovich and D. Iourinski in Geombinatorics, Vol. 12, No. 2, pages 69–75; 2003.

Neuropareidolia: Diagnostic Clues Apropos of Visual Illusions. P. Maranhão-Filho and M. B. Vincent in Arquivos de Neuro-Psiquiatria, Vol. 67, No. 4, pages 1117–1123; December 2009.

The Face of Testicular Pain: A Surprising Ultrasound Finding. G. Gregory Roberts and Naji J. Touma in Urology, Vol. 78, No. 3, page 565; September 2011.

Satan in the Smoke? A Photojournalist's 9/11 Story. Mark D. Phillips. South Brooklyn Internet, 2011.

Lateralization of Face Processing in the Human Brain. Ming Meng, Tharian Cherian, Gaurav Singal and Pawan Sinha in Proceedings of the Royal Society B. Published online January 4, 2012.

What's in a Face? Susana Martinez-Conde and Stephen L. Macknik in Scientific American Mind, Vol. 22, No. 6, pages 15–17; January/February 2012.


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  1. 1. lamorpa 11:17 AM 9/10/12

    :-) (Oops. Just typed some random keys...)

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  2. 2. sparcboy in reply to lamorpa 11:37 AM 9/10/12

    What do you mean?....wait...my fusiform gyrus is waking up....oh...now I get it!

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  3. 3. JMBBB 10:33 PM 9/10/12

    I have to disagree with the concept of mental disease. If you are referring to mental illness, then know that there is no such thing. I have extensive knowledge of psychiatry and I have found absolutely no objectivity in the fields of psychology and psychiatry. They are sham "sciences" and should be abolished. People are literally being locked up in mental institutions merely for not conforming with societal norms.

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  4. 4. lamorpa in reply to JMBBB 08:23 AM 9/11/12

    JMBBB,
    I wonder if any of the people employed in psychological services and assistance have, "extensive knowledge of psychiatry"? Have you contacted them?

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  5. 5. Liveinawe in reply to JMBBB 03:21 PM 9/11/12

    I'd like to hear more about your extensive revelations in the 'sham' psychology. I happen to hold similar awareness.

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  6. 6. dbltapp 03:51 PM 9/12/12

    Two of the photos pointed out in the article aren't showing.

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  7. 7. Diogenes11 07:39 PM 9/12/12

    Pareidolia isn't a mental illness, unless machines are becoming human.
    My iPhoto recognises various inanimate object as faces, including rocks and shrubs, which look a lot less 'facial' than the WTC image in this article.
    The algorithm, which is probably crudely analogous to human perception, obviously selects for face-like structures eg 2 round 'eyes' at the same height.

    The most fun, for the human observer, is when the computer's facial recognition algorithm gives its helpful comment- "Is this Bob?" in relation to a landscape or a rose bush.

    My iPhoto did not detect a face in the WTC image - I was rather hoping it might be my mother-in-law...

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  8. 8. bucketofsquid 10:05 AM 9/14/12

    Every time someone complains about Psychiatry being a sham it is pretty obvious that they have a mental disorder just like L. Ron Hubbard.

    I don't see a face in the smoke. I've occasionally seen faces in floor tile or pictures but I have to be tired or really working at it.

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  9. 9. lamorpa in reply to bucketofsquid 10:40 AM 9/14/12

    bucketof:-)squid,
    Maybe you are just not loo8-)king close en;^/ough.

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