I knew there had to be others with the same ???? Been able to do this for 25+ yrs. The search for this online has been exhausting. I'm glad you guys made the effort to be found. For me, it's nothing like tingling goose bumps and hair standing up. As a kid I named it "Negative motion". Whatever that meant to me then! I guess because it feels like expending energy yet remaining still. I can induce it at will. Approximately 0.1 sec ramping from min. to max 'amplitude". Can increase it very slowly as well. At termination the sensation dissipates in approximately 1-2 sec. I can maintain it, seemingly, indefinitely at less than max. Quite mentally tiring at max. Mentally exhausting in proportion to duration and/or magnitude. Heart rate increases slightly and briefly at start but returns to normal when reach "constant amplitude". Initial surge of the sensation, then the sensation feels like a current maintained by voltage. Can select individual arms/legs. Upper or lower torso or both, front or back. Head. Can smoothly and slowly transition to different areas or quickly switch. If I don't focus consistently some muscle twitching occurs. Can modulate frequency and or amplitude. Damn. All this and it's probably useless. Would like to see if an EKG might detect it. Lie detector? Current or induced electro-magnetic field? I wonder if the sensation is actually peripheral. Maybe it's at the brain/nerves interface or deeper in the brain.