Some terminology, in case its helpful....Electromagnetism is light. In common usage, people call it light when they can see it, and radio or infra-red when they can't because the wavelengths are wrong for the design and dimensions of their eyes, but its the same stuff. Magnetism might be thought of as the passive aspect of light. Electric force, such as would move electrons, might be thought of as the active aspect.
As far as I know, it would take a very strong magnetic field to physically harm a person, though this isn't something I've looked up. If you move in a magnetic field it induces an electric current, but it would take a fairly strong field to fry something. The effects would depend strongly on the frequencies involved.
I see two primary dangers in relation to electromagnetically stimulating the brain, aside from shocking or burning yourself of course.
Usually, when you systematically do anything to your body, your body tries to compensate. Its already in the balance it wants to be in. This is why most drugs loose their effect eventually, unless you keep upping the dosage. Some things you can consciously control because you're aware of it. For instance, you can control your breathing. Other things you can't control because you're not aware of it. Generally speaking, the stuff that you're not aware of is hidden because if you were aware of it you'd alter it in potentially dangerous ways. Natural selection keeps it subconscious. For example, though you are aware of many of your thoughts, you're not aware of how active your brain is in any particular range of frequencies. If you were to become aware of it, such as by measuring it with an oscilloscope, you would find that you can control it. A danger with this is how do you know if you're hurting yourself? Your brain is responsible for telling you if there's a problem, but you've altered its ability to do that. In other words, you're breaking the instrument that tells you if you're breaking the instrument. Just by measuring your brain activity and consciously altering it, without applying any external stimuli, you can make yourself crazy. Fortunately this can usually be reversed later by doing the opposite of whatever conditioning you were doing, as far as I know. Some people scoff and think this stuff is "safe", because after all they're doing nothing but thinking about an image on a screen. But they don't understand what they're talking about.
"Spiritual" experiences aren't understood scientifically, but I know for certain from my experiences that such things are not electromagnetic. So, for example, out of body experiences can be stimulated electromagnetically, but we don't understand very well what's really going on at deeper levels. We do know that there is ebb and flow at deeper levels, and things needing to be kept in balance. So if you do something to your body physically that produces some 'spiritual' experience, you can't tell if you're harming or helping yourself unless you understand how it all works. And we don't have that understanding. Another problem with neurofeedback, as I see it, is that it can be used to "fix" surface psychological conditions, but with much more serious consequences at a more hidden level. Therapeutic drugs tend to be like that also. I guess the best a person can do is listen to themselves the best they know how, and stop if they feel something is wrong. But as with a lot of drug use, you don't know if something is wrong if you've altered your ability to tell. So observing other people who have practiced a technique for a long period of time, and seeing what problems they objectively have, is another way of learning about such things. And this is where a lot of my critical attitude comes from, I've been paying attention to this for 20 years, and a lot of what I've seen is quite sad or disturbing.
It seems to me that being honest and open with oneself, and trying to treat other people right, perceiving things how they really are, is what's important. And if you do that, this does develop you spiritually and open up new realms of experience.
Gotta go.
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