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But you can imagine looking inside the brain. And here's inside the brain.
不過我們能想象大腦內部發生了什么。圖上就是大腦內部。
You might have a little predictor, a neural simulator, of the physics of your body and your senses.
里面可能有一個預測結構，也就是神經組成的模擬器來模擬身體和感覺器官的物理過程。
So as you send a movement command down, you tap a copy of that off and run it into your neural simulator to anticipate the sensory consequences of your actions.
當一個動作指令發出來的時候，大腦復制一份這個指令，然后在這個神經模擬器上運行，來預測出這個動作帶來的感官回饋結果。
So as I shake this ketchup bottle, I get some true sensory feedback as the function of time in the bottom row.
所以我往下磕這個番茄醬瓶子的時候，在下面那行里我得到真實的感官回饋，是個關于時間的函數。
And if I've got a good predictor, it predicts the same thing.
同時大腦里的預測結構如果準確的話，也預測出了同樣的結果。
Well why would I bother doing that?
好了，那我為什么非要多此一舉來預測呢？
I'm going to get the same feedback anyway. Well there's good reasons.
畢竟最終我總能得到同樣的回饋。不過這樣確實是有原因的。
Imagine, as I shake the ketchup bottle, someone very kindly comes up to me and taps it on the back for me.
想象我磕這個番茄醬瓶子的時候，臺下有位熱心觀眾過來幫我拍了下瓶底。
Now I get an extra source of sensory information due to that external act.
于是我多了一個感官信息的來源因為我多接受了這個外在的動作。
So I get two sources.
所以感官回饋現在有兩個來源。
I get you tapping on it, and I get me shaking it, but from my senses' point of view, that is combined together into one source of information.
一個是你拍瓶底的動作，另一個是我磕瓶子的動作，但是從我的感覺來講，這兩個是合起來作為一個信息源的。
Now there's good reason to believe that you would want to be able to distinguish external events from internal events.
可是我們有理由相信，我們希望能夠把外來事件和內在的事件區分開。
Because external events are actually much more behaviorally relevant than feeling everything that's going on inside my body.
因為實際上相對于我身體上發生的內在事件，外來事件在行為上才更有分析價值。
So one way to reconstruct that is to compare the prediction -- which is only based on your movement commands -- with the reality.
所以區分開來的一種辦法就是把我的預測結果--因為這個結果只基于我的動作指令--和真實的感官反饋做比較。
Any discrepancy should hopefully be external.
希望兩者的差值應該就是外力的結果。
So as I go around the world, I'm making predictions of what I should get, subtracting them off.
所以我和外界接觸的時候，我預測出我自己的動作可能得到什么回饋，減掉這些。
Everything left over is external to me.
剩下的其他部分就是外界對我的產生的作用。
