So why are we able to move (or seem to move) lightning fast when we have a reflex, but we are unable to move that fast and acutely at will?
In: Biology
You can think of your brain as the boss, your spine as the overseer and your muscle (+ some local nerves) as the worker.
If the boss decides he wants the worker to do something, he tells the overseer, who tells the worker, who does the task. This takes some time.
A reflex is like the worker seeing something going wrong, so he just screams at the overseer, who screams some instructions back. The whole process is very quick *because* the boss is not involved.
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