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  • Can you read in the car?


  • If so, consider yourself pretty lucky.


  • For about one-third of the population, looking at a book while moving along in a car or a boat or train or plane quickly makes them sick to their stomach.

    3 分の 1 の人にとって、車やボート、電車や飛行機で読書をするとすぐに胃腸に不調が現れます。

  • But why do we get motion sickness in the first place?


  • Well, believe it or not, scientists aren't exactly sure.


  • The most common theory has to do with mismatched sensory signals.


  • When you travel in a car, your body is getting two very different messages.

    車で移動している時、あなたの体は 2 つの異なったメッセージを受け取っています。

  • Your eyes are seeing the inside of a vehicle, which doesn't seem to be moving.


  • Meanwhile, your ear is actually telling your brain you're accelerating.


  • Wait, your ear?


  • Yeah, your ear actually has another important function besides hearing.


  • In its innermost part lies a group of structures known as the vestibular system, which gives us our sense of balance and movement.


  • Inside there are three semicircular tubules that can sense rotation, one for each dimension of space.

    内部には回転を感じる 3 つの半円の細管がありそれぞれが各次元を担当しています。

  • And there are also two hair-lined sacks that are filled with fluid.

    また、液体で満たされた毛流れのような袋が 2 つあります。

  • So when you move, the fluid shifts and tickles the hairs, telling your brain whether you are moving horizontally or vertically.


  • With all these combined, your body can sense which direction you're moving in, how much you've accelerated, even at what angle.


  • So, when you are in the car, your vestibular system correctly senses your movement, but your eyes don't see it, especially if they are glued to a book.


  • The opposite can happen, too.


  • Say you are sitting in a movie theater and the camera makes a broad, sweeping move.


  • This time, it's your eyes that think you're moving while your ear knows that you're sitting still.


  • But why does this conflicting information have to make us feel so terrible?


  • Scientists aren't sure about that either, but they think that there's an evolutionary explanation.


  • You see, both fast moving vehicles and video recordings have only existed in the last couple of centuries, barely a blink in evolutionary time.

    御存知の通り、早く動く乗り物と録画記録は過去 200 年しか存在しておらず、長い進化の過程のわずか一瞬でしかありません。

  • For most of our history, there just wasn't that much that could cause this kind of sensory mix-up.


  • Except for poisons.


  • And because poisons are not the best thing for survival, our bodies evolved a very direct but not very pleasant way to get rid of whatever we might have eaten that was causing the confusion.


  • This theory seems pretty reasonable, but it leaves a lot of things unexplained, like why women are more affected by motion sickness than men, or why passengers get more nauseous than drivers.


  • Another theory suggests that the cause may have more to do with the way some unfamiliar situations make it harder to maintain our natural body posture.


  • Studies have shown that being immersed in water or just changing your stance can greatly reduce the effects of motion sickness.


  • But, again, we don't really know what's going on.


  • We all do know some of the more common remedies for car queasiness


  • looking at the horizon, chewing gum, taking over-the-counter pills


  • but none of these are totally reliable, nor can they handle really intense motion sickness.

    NASA では、宇宙飛行士は一時間ごとに 17000 マイルほど宙に投げ出されるため、乗り物酔いは深刻な問題です。

  • And sometimes, the stakes are far higher than just not being bored during a long car ride.

    ですから、最新の宇宙時代技術を研究することに加えて、NASA はどうすれば宇宙飛行士が慎重に用意された宇宙食を戻してしまうことを防げるかを理解しようと時間をかけています。

  • At NASA, where astronauts are hurled into space at 17,000 miles per hour, motion sickness is a serious problem.


  • So, in addition to researching the latest space-age technologies, NASA also spends a lot of time trying to figure out how to keep astronauts from vomiting up their carefully prepared space rations.


  • Much like understanding the mysteries of sleep or curing the common cold,

  • motion sickness remains one of those seemingly simple problems that, despite amazing scientific progress, we still know very little about.

  • Perhaps one day, the exact cause of motion sickness will be found, and with it, a completely effective way to prevent it.

  • But that day is still on the horizon.

Can you read in the car?



ワンタップで英和辞典検索 単語をクリックすると、意味が表示されます

B1 中級 日本語 TED-Ed 乗り物 酔い 動い 宇宙 読書

TED-ED】乗り物酔いの謎-ローズ・イブレス (【TED-Ed】The mystery of motion sickness - Rose Eveleth)

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    Go Tutor に公開 2021 年 01 月 14 日