I've been studying this topic for some time, as I can induce this electric feeling anywhere in my body, and move it around just like others have reported. When I focus the sensation in my head, it makes my left pupil dilate, but leaves the right unaffected.
I can also, by doing something that feels akin to swallowing but at the base of my skull and requiring no physical movement, send what feels like tiny bubbles radiating out in all directions.
This is not what I experience during ASMR, as someone else suggested. Not even close. This is entirely volitional, not something that's induced by external stimuli, location, circumstance or mental state. I believe these sensations are related, but not identical.
Can anyone else do/explain their experience with the "swallowing" I described. To me it feels like I have to wait for it to recharge before doing it again. Sometimes the feeling is stronger, sometimes weaker or slower spreading, but it does not seem to correlate with time spent "recharging".
I have no bothersome extended sleep paralysis, or brain dysfunction that I'm aware of. I'm 34, and have been able to do this for as long as I can remember.
