I experience both asmr and frisson so I am familiar with both. They are similar in that they both cause a tingling sensation. Asmr is triggered mainly by physical senses (sight, sound, sometimes smell) and produces a relaxing effect. Like you literally can fall asleep from it. Frisson is triggered by thought and emotion and produces an exciting effect.
Smithsonian: "How Researchers Are Beginning to Gently Probe the Science Behind ASMR" — "The burgeoning Internet phenomenon was so new, it didn’t even have a name. It was so strange and hard to describe that many people felt creepy trying. It resided at the outer edge of respectability: a growing collection of YouTube videos featuring people doing quiet, methodical activities like whispering, turning magazine pages and tapping their fingers. Some viewers reported that these videos could elicit the most pleasurable sensations: a tingling feeling at the scalp and spine, coupled with euphoria and an almost trance-like relaxation.
I forgot to mention and may be interesting to people curious about such effects. One "mantra" or intention that I have assimilated in silence and often keep repeating softly inside is "Bless All Beings". There's a famous Sanskrit mantra that basically says the same, but English also works, and may work better for Westerners as intentions need to have meaning, not just repeating syllabuses without understanding or intention.
Allen verified in a 2016 interview that she purposely selected these terms because they were more objective, comfortable, and clinical than alternative terms for the sensation. Allen explained she selected the word meridian to replace the word orgasm due to its meaning of point or period of greatest prosperity.[clarification needed]