chicken_salad

I can do this too, and I'm interested in trying to learn more about the phenomenon from a practical/scientific perspective. I do not experience goosebumps, nor temperature changes, though many of the other descriptions match my experience. I'd describe it as akin to an adrenaline rush without negative emotional associations like fear, though I've never had an adrenaline rush that occupied my whole body like this sensation does. Mine is activated immediately behind my sternum, then radiates to my extremities. If I max it out, minor tremors can occur. After reading through the thread, I will try testing the SNS theory by having my partner observe my pupils for dilation etc. I've also been experimenting with activating the sensation at less than 100%, then "pulsing" it so that it never gets so intense that I feel I must stop before I blow a gasket. Initial results indicate that this method causes the euphoric feeling to persist for some minutes, even after I'm done activating the sensation. It may have also given me a bit of a headache. I know this is a science forum, and I'll do my best to respect that. I'm so thrilled to find a group of people that share my experience, so please be gentle even if the topic feels like a strange fit for this context. If we can figure out how to control this sensation, it could really help our community out! I'll do some tests then report back.