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  • So, you've just begun your road trip with some friends when you decide to read a book in the back seat.

    你正和朋友們踏上公路旅行,而你決定在後座開始看書。

  • But after only moments of reading, you start feeling dizzy, fatigued and nauseous.

    但僅僅只是讀了一下子,你就開始感到頭暈、疲勞和噁心。

  • Sounds like motion sickness...

    你應該是暈車了……

  • The surprising truth is that about 30 percent of the population experiences motion sickness with over 66 percent of people experiencing it in extreme conditions.

    意外的是,30% 的人都有暈車的問題,而超過 66% 的人在極端情況下會暈車。

  • This happens when your eyes and inner ear are sending different signals to the brain.

    當你的眼睛和內耳傳送不同的訊號到腦部時,就會有暈車的症狀。

  • The vestibular system inside your ear contributes to balance and spatial orientation.

    耳內的前庭系統能幫助我們維持平衡和空間定位。

  • Tiny hairs inside the canal detect the movement of a fluid inside it allowing you to orient yourself.

    管內的細毛會偵測內部液體流動,好幫助你定位。

  • If you lean to the side, the fluid moves and signals are sent to your brain to help you understand this.

    如果你偏向某一邊,液體就會流動,訊號也會被送到大腦讓你知道。

  • But oftentimes, in a car, on a boat, or in the IMAX theatre your vestibular system is transmitting a different signal from your other senses.

    但在車裡、船上或是立體感官電影院內時,前庭系統與其他感官傳送的訊號時常不一致。

  • In the case of your car, your eyes see that everything in the car is seemingly stationary, particularly when you stare at a book.

    以乘車為例,你的眼睛接收到的是車內所有東西都是不動的,尤其當你正盯著書看時。

  • But your ears feel the movement of the car.

    但你的耳朵感覺到的是車子在移動。

  • Conversely, in the IMAX theatre, your eyes see a lot of motion while your ear is experiencing very little movement at all.

    相反的,在立體感官電影院內,你的眼睛感測到了許多動作,然而耳朵卻只感受到些微震動。

  • This mismatch of signals tells the brain something's wrong.

    這種不一致的訊號,告訴大腦有異狀。

  • So why does it induce vomiting?

    那為什麼會導致嘔吐呢?

  • The leading theory suggests that, evolutionarily, if the input signals from your ears and eyes weren't matching, you'd likely ingested a neurotoxin.

    領導理論認為,從進化論角度來看,如果你的眼睛和耳朵輸入訊息不吻合,你很可能是攝入了神經毒素。

  • The easiest way to get rid of it? Throw it up.

    排除神經毒素最簡單方式是什麼?吐出來。

  • This was a fairly useful and accurate system before the advent of technology and advanced transportation.

    在科技和交通出現之前,這是一個相當有用又精確的系統。

  • Too bad the brain never got the memo.

    可惜的是,大腦從沒收到關於這些改變的通知。

  • Got a burning question you want answered?

    有問題迫不及待想知道答案嗎?

  • Ask it in the comments or on Facebook and Twitter.

    在下方的留言提問,或是在臉書和推特上留言。

  • And subscribe for more weekly science videos.

    記得訂閱我們的頻道,觀賞更多每週一次科學影片。

So, you've just begun your road trip with some friends when you decide to read a book in the back seat.

你正和朋友們踏上公路旅行,而你決定在後座開始看書。

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坐車滑手機滑到想吐?到底暈車怎麼造成 (Motion Sickness - What is it?)

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