Sounds like just normal. When you feel it you know it. That jumping around sensation can start just like yours did. Mine starts at the base of my neck traveling up like the hairs on the back of my neck are standing up, but more relaxing and very nice. Feel like giggling inside, then shoots up to my scalp and down my arms and waves travel everywhere. Whole thing can be over in a few seconds. Experiencing the trigger over again still produces symptoms but maybe not so much/or in different places. You get to feel kind of drugged. I may not feel it if I listen to a song I love from beginning to end, but will if it’s a snippet of the chorus or lead up to it. A few minutes ago I got triggered from hearing a sample from iTunes of a song I bought recently. That song has a lot of trigger types in it. Sounds like whispers or gentle waves, light tapping beats, breathy singing, violins.
The first study to perform actual brain imaging (fMRI) on subjects currently experiencing ASMR tingles (as opposed to individuals who were merely able to experience the phenomenon) was published in BioImpacts in September 2018. Subjects viewed several ASMR videos with a screen and headphones while inside the MRI scanner. The study found a significant difference in brain activation between time periods when the subject reported tingling (communicated by pressing a button), as compared to time periods when they were watching a video but not reporting tingling (communicated by pressing a different button, to control for brain activation effects caused by merely pressing a button). They concluded that "the brain regions found most active during the tingling sensations were the nucleus accumbens, mPFC, insula and secondary somatosensory cortex", and suggested that these were similar to "activation of brain regions previously observed during experiences like social bonding and musical frisson".
"Seven years later, ASMR is having a pop culture moment—even if many of those who use it don’t know what the acronym stands for. The phenomenon’s most popular practitioners have more than half a million subscribers, and the doyenne of ASMRrtists, Maria of Gentle Whispering ASMR, has been so successful that she’s been able to quit her job to role-play soothing cosmetologists, librarians and flight attendants full-time. But what is ASMR? What function does it serve, who is drawn to it, and why? Or, as researcher Craig Richard puts it: 'Why are millions of people watching someone fold a napkin?'
"ASMR is not as odd as it sounds," said Burnie Burns, co-founder and chief creative officer of production company Rooster Teeth. "In the 90s we had CDs and audio tapes of rain forest sounds that many people used for relaxation purposes -- there just wasn't a fancy term to classify that media. Since online video has become a phenomenon, now we have a whole new generation of those kinds of ephemeral experiences created by people all over the world."
In addition to the effectiveness of specific auditory stimuli, many subjects report that ASMR is triggered by the receipt of tender personal attention, often comprising combined physical touch and vocal expression, such as when having their hair cut, nails painted, ears cleaned, or back massaged, whilst the service provider speaks quietly to the recipient. Furthermore, many of those who have experienced ASMR during these and other comparable encounters with a service provider report that watching an "ASMRtist" simulate the provision of such personal attention, acting directly to the camera as if the viewer were the recipient of a simulated service, is sufficient to trigger it.