To an outsider, the world of ASMR videos can be a baffling, kooky place. In a fast-growing corner of the internet, millions of people are watching each other tap, rattle, stroke and whisper their way through hours of homemade videos, with the aim of being lulled to sleep, or in the hope of experiencing “the tingles” – AKA, the autonomous sensory meridian response.

Some whisper gently into the microphone, while tapping their nails along the spine of a book. Others take a bar of soap and slice it methodically into tiny cubes, letting the pieces clatter into a plastic tray. There are those who dress up as doctors and pretend to perform a cranial nerve exam, and the ones who eat food as noisily as they can, recording every crunch and slurp in 3D stereo sound.

Here are some popular ASMR triggers :

• Whispering – This is most popular ASMR trigger and is usually somebody’s first introduction to ASMR. The main focus on this stimulus is the sound rather than the words, and whispering is such a popular trigger that thousands of YouTube videos designed to trigger ASMR use a whispering techniques.
• Scratching + Tapping – Scratching and tapping can be a very relaxing ASMR trigger. This can be ASMRtists touching physical objects such as brushes or using objects to run against the microphone.
• Physical Touch – A gentle touch on the skin is also an ASMR trigger, thought this is more of an in-person trigger, not elicited by video. The greatest way to experiment this is by using a head massaging implement known as the orgasmatron. For Most people, it creates tingles that are more intense as compared to any other audio ASMR trigger.
• Personal Attention – Personal attention ASMR triggers create an extreme moment between yourself and the video maker. Some popular personal attention situations are makeup tutorials or makeup role-plays, as well as someone playing with your hair or having your wars brushed.

Reference : https://www.sleepphones.com/sites/default/files/ASMR-Triggers-List-Infographic-by-SleepPhones.jpg