As for what can trigger episodes in people, it almost always involves close interaction with another person. Usually, that other person is speaking to you in soft or deep tones, and always kindly. There’s usually also a component of adjacent sound coming from an inanimate object that, in conjunction with a person’s voice, helps trigger the episode. This can be the sound of scissor blades scraping together during a haircut, the sound of someone turning magazine pages, or, in my case, the sound of pennies sliding across concrete.
Every Empath is different but I have not seen a common theme between all the ones I know. I myself have a really weird experience with this (as Empaths normally do with everything). I listen to ASMR every night for about 6 months with no reactions until one random day. Now I get it very occasionally with no pattern in sight. I do know Empaths who get it with basically every video they watch and some who just find the sounds of asmr creepy and do not get the tingle at all.
Richard and his team ask participants to rank the way they’d most prefer to experience ASMR, if YouTube weren’t the only option. (Data from the Swansea University study shows most people have their first ASMR experiences as children, through real-life interactions with family and friends.) “Receiving light touches with my eyes closed” ranked first; sound triggers were below and visual ones lower still—an echo, Richards says, of how the senses develop in human beings.