Short answer: chemicals and electricity.
In a typical computer, you only really see electricity flowing in one direction or another to represent information. 1 or 0.
In a brain, you do have some binary information that works similar to this. But there’s a great deal more happening.
A brain will use electrical signals, whereas strength and frequency matter and represent a greater range of information.
You also have chemicals. You’ve heard of this before. Things like adrenaline, dopamine, serotonin… a brain can pass along and detect this for informational purposes.
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