I'm listening to the audiobook of an early AC Clarke novel, The City and the Stars. It's not his best work, but that's fine, it's from the 1940s. It's uncanny how he predicts virtual reality at least 50 years before it became a possibility. He even has a black hole in the story, a good 30 years before that became well known. He's probably most famous among non-science fiction readers (science fiction non-readers? J4?) for the statement
"Any sufficiently advanced technology is indistinguishable from magic". It's from a set of "laws" called Clarke's Three Laws, which I quote here for some reason.
1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
3. Any sufficiently advanced technology is indistinguishable from magic.
(Wikipedia)
In The City and the Stars, there is a group of people who communicate telepathically, and all people are able to command machines telepathically. This is a fairly common theme in science fiction, but in my opinion, one of the more far-out notions. I don't know how or if Clarke explains telepathy (I've not finished the book), but in this case I think it's closer to magic than technology.
If we were to try and pseudo-explain telepathy and mind reading, we have to assume that one being's brain is able to receive impressions made in another being's brain. Thus, we must assume that the thought-impressions:
(a) radiate through a medium in a decodable form, or
(b) cause radiation through a medium that cause sympathetic "vibes", or
(c) originate from a common source that is readable by both parties.
If you feel I've left something out, please add to the list. In the first two cases, we have to postulate the medium. It seems unlikely that it would be simple electromagnetic radiation, because I don't think we have the equipment for it. Also, surely science would have discovered this before. In any case, we would have to revive the idea of "the luminiferous aether", or something even stranger.
Another problem with (a) is that we'd have to assume that all nervous systems and though patterns are identical, and that when you think "apple", it generates a coded signal that, when received by me, activates the corresponding thought form in my brain. That would mean that if we monitor your brain, we should be able to point to a bunch of neurons and say: Look, this means "50%", this means "off", this means "day-old" and this means "doughnuts". The scenario seems far-fetched to me.
With (b) we can point to "archetypes" as a possible common set of codes. Perhaps when you think of a scary movie monster, part of your brain oscillates at a frequency corresponding to the "bogeyman" archetype. So I may interpret that you are scared of something, but I wouldn't know if it was the Alien, Freddy Kreuger or the Grinch what stole Xmas. So, it may be a useful tool, but not exactly high resolution.
As far as (c) is concerned, that would imply that all consciousness (or large parts) come from the same source, i.e. "God", or something. In this scenario, we might imagine that we are tethered, by an umbilical cord-like thing which extends into an unseen dimension of space, to the holy Mainframe. Here, a thought had by an outer head is relayed to (or relayed by) the inner head, and becomes accessible to another outer head, either by requisition or by hacking.
Well, this post is getting too long, but I look forward to your posts addressing "The supernatural seen as technology".
A good day to all.
PS It is already possible to command machines by thought alone, but I believe this simply monitors blood flow in the brain and that would require that you wear a sensor cap. Come to think of it, that's what Clarke described in 3001: The Final Odyssey.
https://www.youtube.com/watch?v=poZCINzxzrQ
EDIT: Erratum - The sensor cap measures electrical activity (EEG), not blood flow. That would be FMRI.