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At first, I was also confused about how the brain could generate outputs without inputs; however, I found the example with the thermal motion to be helpful. Initially, I had believed that a cause is needed for an effect, but since particles (in the table) can move with absolutely no outside force to cause this to happen, there must be other instances as well which result from no cause. Because there is now an example to illustrate that an effect can occur without a cause, the brain must also be able to do the same, especially since the brain is capable of so much.  Also, in class I found it interesting when we said that about 20% of our neurons are motor neurons.  This is because when I think of neurons, I automatically assume their function is primarily movement. Basically, when I found out that 99.99…% of neurons are interneurons, it was very surprising.   This brings up the idea that even though we actually assume the nervous system mostly deals with the outside world, it is quite the opposite. We have a lot more going on inside of the body than we think.