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Why Can't You Tickle Yourself?

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By Chris Gayomali

It's darn near impossible to tickle yourself, and the mechanics behind the non-phenomenon of self-tickling are pretty straightforward: Your subconscious mind is always one step ahead of you. Your "unexpected" touch, no matter how cleverly you disguise it, is almost always expected—and that's largely a good thing. Here's how Sara-Jayne Blakemore, a researcher at the Institute of Cognitive Neuroscience at University College London, explained it to Scientific American in 2007:

…the cerebellum can predict sensations when your own movement causes them but not when someone else does. When you try to tickle yourself, the cerebellum predicts the sensation and this prediction is used to cancel the response of other brain areas to the tickle.

Two brain regions are involved in processing how tickling feels. The somatosensory cortex processes touch and the anterior cingulate cortex processes pleasant information. We found that both these regions are less active during self-tickling than they are during tickling performed by someone else, which helps to explains why it doesn't feel tickly and pleasant when you tickle yourself. [Scientific American]

The brain is programmed to anticipate unimportant sensations, like your rear against a comfy chair or the socks on your feet. It saves those valuable synapses for the weird and unexpected, like when there's a poisonous spider crawling down the back of your shirt.

Our utter imperviousness to the self-tickle can even conquer technology intended to camouflage it, to an extent. In a recent interview with NPR, professor Jakob Hohwy, a philosophy researcher at Monash University in Australia, outlines a bizarre and wonderfully elaborate experiment designed to trick the brain.

HOST: In his tickling experiment, Hohwy used his own version of the rubber hand trick. He made his subjects wear a pair of video goggles hooked up to a camera on another person's head. And with good old fashioned synchrony, he got them to feel, as if they were actually the person sitting across the table. And in that moment he had them try to tickle their palm.

HOHWY: And then we ask, how ticklish is it? And it turns out that when they do it themselves, they still can't tickle themselves. [NPR]

There is, however, a lone exception to the no-tickling rule: Schizophrenics have the notable ability to tickle themselves on demand. One theory, according to Hohwy, is that "people with schizophrenia are relatively poor at predicting what the sensory consequences will be of their own movement." Somewhere between the triangulation of fingers, eyes, and the unconscious mind, the electrical signals beamed back to the brain hit a snag.

In many ways, our silly inability to self-tickle showcases the powerful machinery of the human mind at its most efficient: Your brain is in a constant state of trying to predict what's about to happen next. It's always one step ahead and looking to the future, even if you necessarily aren't.

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10 Surprising Facts About The Babadook
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In 2014, The Babadook came out of nowhere and scared audiences across the globe. Written and directed by Aussie Jennifer Kent, and based on her short film Monster, The Babadook is about a widow named Amelia (played by Kent’s drama schoolmate Essie Davis) who has trouble controlling her young son Samuel (Noah Wiseman), who thinks there’s a monster living in their house. Amelia reads Samuel a pop-up book, Mister Babadook, and Samuel manifests the creature into a real-life monster. The Babadook may be the villain, but the film explores the pitfalls of parenting and grief in an emotional way. 

“I never approached this as a straight horror film,” Kent told Complex. “I always was drawn to the idea of grief, and the suppression of that grief, and the question of, how would that affect a person? ... But at the core of it, it’s about the mother and child, and their relationship.”

Shot on a $2 million budget, the film grossed more than $10.3 million worldwide and gained an even wider audience via streaming networks. Instead of creating Babadook out of CGI, a team generated the images in-camera, inspired by the silent films of Georges Méliès and Lon Chaney. Here are 10 things you might not have known about The Babadook (dook, dook).

1. THE NAME “BABADOOK” WAS EASY FOR A CHILD TO INVENT.

Jennifer Kent told Complex that some people thought the creature’s name sounded “silly,” which she agreed with. “I wanted it to be like something a child could make up, like ‘jabberwocky’ or some other nonsensical name,” she explained. “I wanted to create a new myth that was just solely of this film and didn’t exist anywhere else.”

2. JENNIFER KENT WAS WORRIED PEOPLE WOULD JUDGE THE MOTHER.

Amelia isn’t the best mother in the world—but that’s the point. “I’m not a parent,” Kent told Rolling Stone, “but I’m surrounded by friends and family who are, and I see it from the outside … how parenting seems hard and never-ending.” She thought Amelia would receive “a lot of flak” for her flawed parenting, but the opposite happened. “I think it’s given a lot of women a sense of reassurance to see a real human being up there,” Kent said. “We don’t get to see characters like her that often.”

3. KENT AND ESSIE DAVIS TONED DOWN THE CONTENT FOR THE KID.

Noah Wiseman was six years old when he played Samuel. Kent and Davis made sure he wasn’t present for the more horrific scenes, like when Amelia tells Samuel she wishes he was the one who died, not her husband. “During the reverse shots, where Amelia was abusing Sam verbally, we had Essie yell at an adult stand-in on his knees,” Kent told Film Journal. “I didn’t want to destroy a childhood to make this film—that wouldn’t be fair.”

Kent explained a “kiddie version” of the plot to Wiseman. “I said, ‘Basically, Sam is trying to save his mother and it’s a film about the power of love.’”

4. THE FILM IS ALSO ABOUT “FACING OUR SHADOW SIDE.”

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Kent told Film Journal that “The Babadook is a film about a woman waking up from a long, metaphorical sleep and finding that she has the power to protect herself and her son.” She noted that everybody has darkness to face. “Beyond genre and beyond being scary, that’s the most important thing in the film—facing our shadow side.”

5. THE FILM SCARED THE HELL OUT OF THE DIRECTOR OF THE EXORCIST.

In an interview with Uproxx, William Friedkin—director of The Exorcist—said The Babadook was one of the best and scariest horror films he’d ever seen. He especially liked the emotional aspect of the film. “It’s not only the simplicity of the filmmaking and the excellence of the acting not only by the two leads, but it’s the way the film works slowly but inevitably on your emotions,” he said.

6. AN ART DEPARTMENT ASSISTANT SCORED THE ROLE AS THE BABADOOK.

Tim Purcell worked in the film’s art department but then got talked into playing the titular character after he acted as the creature for some camera tests. “They realized they could save some money, and have me just be the Babadook, and hence I became the Babadook,” Purcell told New York Magazine. “In terms of direction, it was ‘be still a lot,’” he said.

7. THE MOVIE BOMBED IN ITS NATIVE AUSTRALIA.

Even though Kent shot the film in Adelaide, Australians didn’t flock to the theaters; it grossed just $258,000 in its native country. “Australians have this [built-in] aversion to seeing Australian films,” Kent told The Cut. “They hardly ever get excited about their own stuff. We only tend to love things once everyone else confirms they’re good … Australian creatives have always had to go overseas to get recognition. I hope one day we can make a film or work of art and Australians can think it’s good regardless of what the rest of the world thinks.”

8. YOU CAN OWN A MISTER BABADOOK BOOK (BUT IT WILL COST YOU). 

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In 2015, Insight Editions published 6200 pop-up books of Mister Babadook. Kent worked with the film’s illustrator, Alexander Juhasz, who created the book for the movie. He and paper engineer Simon Arizpe brought the pages to life for the published version. All copies sold out but you can find some Kent-signed ones on eBay, going for as much as $500.

9. THE BABADOOK IS A GAY ICON.

It started at the end of 2016, when a Tumblr user started a jokey thread about how he thought the Babadook was gay. “It started picking up steam within a few weeks,” Ian, the Tumblr user, told New York Magazine, “because individuals who I presume are heterosexual kind of freaked out over the assertion that a horror movie villain would identify as queer—which I think was the actual humor of the post, as opposed to just the outright statement that the Babadook is gay.” In June, the Babadook became a symbol for Gay Pride month. Images of the character appeared everywhere at this year's Gay Pride Parade in Los Angeles.

10. DON'T HOLD YOUR BREATH FOR A SEQUEL.

Kent, who owns the rights to The Babadook, told IGN that, despite the original film's popularity, she's not planning on making any sequels. “The reason for that is I will never allow any sequel to be made, because it’s not that kind of film,” she said. “I don’t care how much I’m offered, it’s just not going to happen.”

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Space
NASA Is Posting Hundreds of Retro Flight Research Videos on YouTube
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If you’re interested in taking a tour through NASA history, head over to the YouTube page of the Armstrong Flight Research Center, located at Edwards Air Force Base, in southern California. According to Motherboard, the agency is in the middle of posting hundreds of rare aircraft videos dating back to the 1940s.

In an effort to open more of its archives to the public, NASA plans to upload 500 historic films to YouTube over the next few months. More than 300 videos have been published so far, and they range from footage of a D-558 Skystreak jet being assembled in 1947 to a clip of the first test flight of an inflatable-winged plane in 2001. Other highlights include the Space Shuttle Endeavour's final flight over Los Angeles and a controlled crash of a Boeing 720 jet.

The research footage was available to the public prior to the mass upload, but viewers had to go through the Dryden Aircraft Movie Collection on the research center’s website to see them. The current catalogue on YouTube is much easier to browse through, with clear playlist categories like supersonic aircraft and unmanned aerial vehicles. You can get a taste of what to expect from the page in the sample videos below.

[h/t Motherboard]

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