The neurobiology of the Mona Lisa’s smile

For hundreds of years, art critics have mused over why the Mona Lisa’s smile seems so mysterious. Now the Harvard neurobiologist Margaret Livingstone has a fascinating answer: It’s because Da Vinci painted her face in colors that play tricks on the eye.

Livingstone’s work has long examined the way that different cells in the visual system process different types of information — such as form, color, depth and movement. When she analyzed the Mona Lisa, she found that Da Vinci painted her smile almost completely in low spatial frequencies, and these are best picked up in your peripheral vision. The result, as she notes on her web site, is a nifty illusion:

These three images — [pictured above!] — show her face filtered to show selectively lowest (left) low (middle) and high (right) spatial frequencies.

So when you look at her eyes or the background, you see a smile like the one on the left, or in the middle, and you think she is smiling. But when you look directly at her mouth, it looks more like the panel on the right, and her smile seems to vanish. The fact that the degree of her smile varies so much with gaze angle makes her expression dynamic, and the fact that her smile vanishes when you look directly at it, makes it seem elusive.

It’s somewhat like the way rods in the eye are more numerous in the periphery of our retinas — so the best way to see a faint star in the night sky is to look slightly to the side of it. Either way, this is really cool science.

Cooler than the actual Mona Lisa, really. When I visited the painting a few year ago, I found the experience incredibly underwhelming, because the painting is so ferociously guarded by security devices: A velvet rope preventing you from coming closer than 20 feet, storm troopers with tasers, and, worst of all, a plastic box that produces reflections of light so garish that they destroy any effect Da Vinci was trying to make. Seriously — I get a more moving artistic experience when I look at a low-rez gif of the painting on Flickr. Walter Benjamin would be rolling in his grave.

(Thanks to David Dobbs for this one!)


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I'm Clive Thompson, a writer on science, technology, and culture. This blog collects bits of offbeat research I'm running into, and musings thereon.

Currently, I'm a contributing writer for the New York Times Magazine and a columnist for Wired magazine. I also write for Fast Company and Wired magazine's web site, among other places. Email or AOL IM me (pomeranian99) to say hi or send in something strange!

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The “Milky Way Transit Authority” map

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January 31, 2010 » 07:29 PM
V. A. To me death seems to be an evil.
M. What, to those who are al­ready dead? or to those who must die?
A. To both.
M. It is a mis­ery, then, be­cause an evil?
A. Cer­tain­ly.
M. Then those who have al­ready died, and those who have still got to die, are both mis­er­able?
A. So it ap­pears to me.
M. Then all are mis­er­able?
A. Ev­ery one.

January 24, 2010 » 03:22 PM

One of the more interesting trends is family, which came in at number five. Specifically, discussion about family, moms, dads, daughters, etc. jumped during 2009. With Facebook users getting older, this isn’t a big surprise. However, the fact that the mention of “kids” jumped by a factor of five this year is rather dramatic. It’s tough to know what this means, though. (via Facebook Unveils Most-Mentioned Topics of 2009

)

January 15, 2010 » 01:36 PM

BEYOND AWESOME. They are announcing a recall of the Plush Uterus “due to a potential choking hazard for children”. To apply for it, “Please send an email to the address below with the subject line, ‘UTERUS OPT OUT’”.

January 14, 2010 » 10:04 PM

“To order, please TYPE “YES” IN CHECKBOX BELOW TO AGREE YOU UNDERSTAND THIS PLUSH MUST BE KEPT AWAY FROM KIDS (it is a sex organ, after all). If it is not checked, WE WILL NOT SEND THE UTERUS.” (via @ibogost)

January 11, 2010 » 01:45 PM

I watched Space: 1999 back in the day, but I swear to god I do not remember this scene.

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