時(shí)差N小時(shí):跑步機(jī)與意識(shí)

Lots of people these days get their exercise at gymsand health clubs, oftentimes by walking or runningon treadmills—that is to say, running without goinganywhere. If you've ever been on a treadmill forsome time and then suddenly stepped off it, you'veprobably experienced the weird sensation that youare suddenly moving much faster than you think youshould be. Why?

這些天很多人去健身房、健康俱樂(lè)部鍛煉身體，時(shí)間大多花在跑步機(jī)上——也就是說(shuō)原地不動(dòng)行走或者跑步。如果你在跑步機(jī)上跑了一段時(shí)間，突然停下時(shí)，你心頭可能會(huì)出現(xiàn)一種古怪的感覺(jué)：你移動(dòng)得比實(shí)際要快。為什么?

This deceptive sensation is the result of sending your brain two different signals at once. Thefirst signal is the one coming from your legs; during exercise they are in rapid, regular motion,and the brain understands by this fact that the body is moving through space. The secondsignal comes from the eyes, which are seeing that the objects around you are not passing by,and hence you are standing still. In a sense your eyes are disagreeing with your legs. The resultis that after about ten minutes of this input disparity, the brain recalibrates its internal senseof motion.

這種欺騙性的感覺(jué)實(shí)際上是大腦一次傳遞兩種不同信號(hào)的結(jié)果。第一種信號(hào)來(lái)自于你的雙腿，在鍛煉的時(shí)候它們快速，有規(guī)律地移動(dòng)，然后大腦把這個(gè)事實(shí)理解成在空間里穿行。第二種信號(hào)來(lái)自于你的眼睛，眼睛看到的周?chē)奈矬w并沒(méi)有遠(yuǎn)去，因?yàn)槟闶钦局粍?dòng)的。在意識(shí)里，你的眼睛和你的腿是不一致的。結(jié)果，在這種輸入分歧之后大約十分鐘，大腦開(kāi)始重新調(diào)整內(nèi)心的動(dòng)作感。

In simple terms, your brain tells itself: this is how fast objects move by when I'm walking atthis rate, as opposed to what was formerly the case. That means when you step off thetreadmill and begin actually moving through space again, your recalibrated brain is now sentthe incorrect message that you have suddenly increased your speed significantly. Once again,what the legs say and what the eyes say is out of sync. The sensation of accelerated motion isonly temporary, though, and the ever-adaptable brain soon readjusts itself once more—untilthe next time you step up on that rolling, immobile track.

單純意義上來(lái)說(shuō)，大腦告訴自己：當(dāng)我以這樣的速度行走時(shí)，身邊的物體也以同樣的速度在移動(dòng)，不同于先前那種情況。這意味著，當(dāng)你跳下跑步機(jī)再次開(kāi)始真正的空間運(yùn)動(dòng)時(shí)，你調(diào)整過(guò)一次的大腦將會(huì)發(fā)送錯(cuò)誤的信息：你突然加度了。腿和眼睛傳達(dá)的信號(hào)再一次不同步。盡管加速運(yùn)動(dòng)的感覺(jué)只是暫時(shí)的，能不時(shí)順應(yīng)的大腦很快又會(huì)再次調(diào)整，直到下次你再踩在那滾動(dòng)著但穩(wěn)定的軌道上。