Hurr, even if we pinpointed a "lucidity center," that "lights up" whenever you are lucid, it doesn't mean that stimulating it will produce lucidity. That's like saying stimulating your occipital lobe will cause you to see, or stimulating your Brocha's area will cause you to speak. But that's not how the brain works. There's more involved, here. I'll describe speaking to illustrate my point. First, you must already be thinking about something (frontal lobe), then you think about what you're going to say (frontal lobe, Wernicke's area, Broca's area), the words you'll use (Wernicke's), and whether or not you're really going to say it (frontal lobe, and if you choose to speak, thalamus, then cerebellum and Broca's).
And what I described is a general outline of speech. If you stimulated those spots in the brain, even in order, I doubt you'd end up with speech, simply because the conscious mind wouldn't know why it was being stimulated. You'd end up hallucinating (hearing voices, most likely) and maybe babbling a nonsense syllable or two, as your mind tried making sense of the spontaneous stimulation.
If getting someone to utter anything via brain stimulation is that difficult, think how implausible it is to stimulate someone into speaking a specific sentence!
Similarly, think of how hard it would be to stimulate someone into thinking a specific thought! There's a web it has to go through, highly coordinated, spread over parts in the entire cerebrum, and the specific path (though the term "path" is misleading. It's more like a series of paths running simultaneously, and multiple sets of paths can lead to the same spot.) to a specific thought is different, specialized in each person.
Even if you stimulated their "center of awareness," they wouldn't have an idea as to why they're feeling enlightened/aware, so, much like a drug trip, they'd hallucinate a reason.
And thank evolution for that! Thank evolution for this complexity, this security system. I'd find it highly, incredibly unnerving if we were ever to find a way to electronically, instantly induce specific thoughts.
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