We all have our idiosyncrasies, those automatic things we do each day that form the way we are in the world. Whether we scrunch or fold, or leave the toilet seat up or down, these are things we do (or don’t do) automatically. Much like the urgent need to crap your dacks in a Japanese bookstore. 


That’s right, there is a significant portion of Japanese people who feel overcome by a heaving sensation in the rectal passage whilst browsing books. 


Now some habits are behavioural. Your parents taught you to brush your teeth before bed so now you just (hopefully) do it for the rest of your life without thinking. Other habits are more biological, like the impulse to yawn when someone else is yawning (unless you’re a psychopath. Apparently they don’t).


Then there’s something called Pavlovian conditioning, which is where you take an instinctive biological response, like drooling when there's food around (mmm doughnuts) and pair it with something like a bell. You take away the food, ring the bell and the drooling now becomes associated with the bell... A psychosomatic response to stimulus.


In 1985, 29-year-old Japanese woman, Mariko Aoki, contributed an article in the Hon no Zasshi or “Book Magazine” about her strong urge to defecate whenever she visited a bookstore. Surprisingly, a significant number of readers wrote to the editorial department to share their similar experiences. Who would have thought so many people had been fending back faeces in the fiction section?! Turns out a lot. 


Hon no Zasshi published a 14-page feature discussing the issue, which they described as “book bowel tendency”. That name never stuck and it became known as the "Aoki Mariko phenomenon". What an honour. The Japanese people got very serious about the spread of this “nervous energy on the anal area”, as one source described it. A survey run by the Japan Publishing Infrastructure Center in 2012 revealed that up to five, perhaps even 10 per cent of all Japanese people had experienced it. Literally millions of people nearly pooping their pants amongst the poetry.


What was going on? Were they all making it up? A sociological phenomenon? 


According to a very small-scale study, women were more likely to say they'd experienced it than men and it was even more uncommon in “sporty males”. Tight glutes perhaps? 


People with really severe or regular symptoms said that it affected their overall quality of life. Some people couldn’t even think about a bookstore without experiencing borborygmus, the rumbling sound made by the movement of gas in the intestine (also undoubtedly the best name for a symptom in all of medicine). 


So why would so many people feel the need to drop a log in the library? In 1985, Hon no Zasshi interviewed a psychiatrist who proposed it was caused by a hyperresponsive reaction to stress - too much information all at once perhaps. 


Then in 2021, Men’s Health Magazine ran a column called “Ask the Poop Doctor” by Dr. Sameer Islam. He confirmed that although Mariko Aoki phenomenon hasn't been medically or scientifically proven, a lot of patients came to see him about it and it was a lot more common than people realise. Some anecdotal evidence shows that others experience this urgent need to shit in other places like parks and museums as well. 


The Wholesome verdict? Well, given no evidence has been found to link Mariko Aoki phenomenon to anything in the physical environment, it certainly seems psychological. And the fact that the phenomenon was contained in Japan indicates a strong sociological aspect too. 


So, next time you’re visiting a bookstore or library, maybe take a quick trip to the loo first. And just to be safe, steer clear of white pants.

 
 
 
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