The earth's magnetic field can move charged particles like electrons, but the field itself won't transfer information between people. It would be like using the sound of the wind in trees to communicate. You can make sound, such as with your voice, but the background noise doesn't help, it's just something extra to be separated from the noise you want to hear. Using electromagnetics to communicate amounts to sending light or radio waves from your brain.
The biggest problem with that, or with using charged particles, is extracting the desired information. It's exactly like trying to see your reflection in a shag carpet, except much harder because the mixing is much greater and the signal is much weaker. This difficulty eliminates the possibility all by itself, as I see it, but here are a couple of other things that don't fit. Electromagnetics effects generally decline in strength in proportion to square of distance. If you could share thought with someone 2000 miles away, you would be blinded by the thought of someone ten feet from you, because the signal would be a trillion times stronger. Yet it seems that distance makes little difference, except insofar as it influences where you put your attention. Also, some people report precognitive effects when sharing thought, and electromagnetics doesn't work for that.
Changing the subject slightly. Some people offer theoretical reasons scientists should be studying shared dreaming. I offered reasons they don't. As a result of this thread, I made another attempt to reach out to researchers on this topic. I got a couple of friendly responses, but no interest in investigation. And the reasons forthe lack of collaboration seem to be pretty much what I described.
Disbelieving in shared dreaming requires believing that all people who describe such experiences are lying, deluded, or insane. And while some experiences can be explained as random coincidences or attributed to other fallacies, some can only be plausibly dismissed as lying or outright insanity. Of course people are free to believe wha they want, and certainly a high portion of believers are quite a bit less than objective. But belief and disbelief is not a symmetrical situation in this sense: believers are not dismissing the personal experience of unbelievers as unreal, but are doing that in relation to some believers. Of course some of those people are going to take offense at being called liars or similar. I agree that the fact that so many believers are liars seems to suggest that they all might be. But there are other reasons for this correlation. For almost any notable personal skill or ability, more people say they can do it than actually can do it, even for thugs that are much more easily provable like athletic or artistic accomplishment. And the absence of doubt, confidence in one's ability, is often key to those who can do it. That lack of doubt often amounts to a lack of objectivity though.
I had what seemed to be a shared dream with someone from this site Thursday night, but I've been too busy to post. That person does not think of shared dreaming as being a matter of two people mentally traveling to the same location. They intentionally tried to reach me, not necessarily at that same time. They appeared as a young, dark haired man. The things I said had to do with motive/economics/destiny. I don't consider this anecdote to be evidence of shared dreaming, I'm just posting it because past experience suggests it would have been a real person, and I haven't yet connected it with anyone.
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