So let’s take a moment to consider all the process that go into solving the “simple” problem of swinging at a baseball. 3/25
flickr.com/photos/nationa… 4/25
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upload.wikimedia.org/wikipedia/comm… 7/25
upload.wikimedia.org/wikipedia/comm… 9/25
![](https://pbs.twimg.com/media/DYGA8i_WsAA-akw.jpg)
frontiersin.org/files/Articles… 15/25
![](https://pbs.twimg.com/media/DYGBNw1W0AAc-OQ.jpg)
![](https://pbs.twimg.com/media/DYGBTkAXUAA0lXE.png)
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So how does the brain know when its predictions are accurate?
The cerebellum.
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![](https://pbs.twimg.com/media/DYGBlQTX0AAGtoH.jpg)
All of these computations have to happen in less than ½ a second (or just slightly longer than it takes to blink your eye).
Still think action decisions are simple? 25/25