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I understand how action potentials cause movement and reaction to outside stimulus. Furthermore, it makes perfect sense to me that having receptors depressed (i.e. touching something) can cause the sensation of touch, but how do thoughts cause action potentials? I’ve learned about action potentials several times now in my biology/psychology career and this point always gets me. I feel as though such a large portion of my every day happens in my head; thoughts, reading silently etc. Some of these thoughts generate actions ( i.e. thinking to sit down and write this post). But what I don't understand is how a thought is produced in the first place and then how this thought is able to generate an action potential. How do we think? How is a thought produced? How do our thoughts cause action potentials to occur and cause movement and sensations? There is still so much that isn't known about the brain that makes learning about it so fascinating.