Tickling Sensation

If your feet bottom or armpit is touched by somebody else, you will feel a tickle and laugh.

Why is that?

Since regions that artery passes close to your skin are danger, a lot of nerve is concentrated so as to be acutely aware of stimulation.

However, even if you touch such regions by yourself, you will not feel a tickle because your cerebellum will predict the stimulus and control it.

On the other hand, if somebody else touches you, your brain will fall into chaos and generate an unpleasant sensation, because your cerebellum can't predict the stimulus.

This sensation is called tickling sensation, it make us laugh to relieve/escape the status.

There is experimental data that monkeys and rats also laugh when they are tickled.

By the way, tickling had been performed as a kind of torture at a time in the past.

くすぐり

他人に脇の下や足の裏を触られると、くすぐったく感じて笑ってしまいます。

これはなぜでしょうか。

動脈が皮膚に近いところを通っている部位は怪我をすると危険であるため、多くの神経が集まって刺激を敏感に感じやすくなっています。

しかし自分で触ってみても、小脳が刺激に対する予測と制御を行なうため、くすぐったくは感じません。

他人に触られると小脳が刺激を予測できないため、脳は混乱状態に陥り、不快な感覚を生じます。

これがくすぐったい、という感覚で、我々はこの状態を和らげたり、あるいは逃れるために、「笑う」という反応をするそうです。

サルやラットもくすぐりに対して笑ったという実験データも存在します。

ちなみに、かつては拷問の一つとしてくすぐりが行われていたそうです。

• If your feet bottom or armpit is touched by somebody else, you will feel a tickle and laugh.
• If your feet bottom sole of feet or armpit is touched by somebody else, you will feel a tickle and laugh.

  Just a better way to refer to bottom of your feet.

• Why is that?
• This sentence is perfect! No correction needed!

• Since regions that artery passes close to your skin are danger, a lot of nerve is concentrated so as to be acutely aware of stimulation.
• Since these are regions that where artery passes is close to your skin are danger, a lot of many nerves is are concentrated so as to be acutely aware of stimulation.

• However, even if you touch such regions by yourself, you will not feel a tickle because your cerebellum will predict the stimulus and control it.
• This sentence is perfect! No correction needed!

• On the other hand, if somebody else touches you, your brain will fall into chaos and generate an unpleasant sensation, because your cerebellum can't predict the stimulus.
• This sentence is perfect! No correction needed!

• This sensation is called tickling sensation, it make us laugh to relieve/escape the status.
• This sensation is called tickling sensation, it makes us laugh to relieve/escape the status.

• There is experimental data that monkeys and rats also laugh when they are tickled.
• This sentence is perfect! No correction needed!

• By the way, tickling had been performed as a kind of torture at a time in the past.
• By the way, tickling had has been performed used as a kind of torture at a time in the past.

Good job!

• Tickling Sensation
• This sentence is perfect! No correction needed!

• If your feet bottom or armpit is touched by somebody else, you will feel a tickle and laugh.
• If your sole of feet or armpit is touched by somebody else, you will feel a tickle and laugh.

• Why is that?
• Why is that so?

• Since regions that artery passes close to your skin are danger, a lot of nerve is concentrated so as to be acutely aware of stimulation.
• Since regions where the artery passes close to your skin are dangerous because it is more prone to injury, many nerves are concentrated so as to be acutely aware of stimulation.

  I think you forgot to add the fact that that region may be easily injured, so I was a little confused at first. If the sentence isn't what you meant, please contact me! ^^

• However, even if you touch such regions by yourself, you will not feel a tickle because your cerebellum will predict the stimulus and control it.
• However, even if you touch such regions by yourself, you will not feel a tickle because your cerebellum will predict the stimulus and control it.

• On the other hand, if somebody else touches you, your brain will fall into chaos and generate an unpleasant sensation, because your cerebellum can't predict the stimulus.
• This sentence is perfect! No correction needed!

• This sensation is called tickling sensation, it make us laugh to relieve/escape the status.
• This sensation is called tickling sensation, it makes us laugh to relieve/escape the status.

  Since you mentioned "sensation" from the start, we already know that tickling is a sensation and hence you do not need to repeat it again.

• There is experimental data that monkeys and rats also laugh when they are tickled.
• There is experimental data that monkeys and rats also laugh when they are tickled.

  I wonder how the laughs of rats sound like...

• By the way, tickling had been performed as a kind of torture at a time in the past.
• By the way, tickling was performed as categorized as a kind of torture at a time in the past.

When I was young, my family and relatives like to tickle me to make me laugh xD They always drew circles on my knees xD