He posted earlier this year on the ASMR subreddit, calling for volunteers, and completed the study in May. First, he looked at how ASMR videos affected "normal people"—18 Dartmouth undergrads. "In the second study we selected only people we knew could reliably experience and report ASMR," he says. "For this we used 10 subjects, most of whom were people from the subreddit who could commute to Hanover, New Hampshire. In this second study we asked the participants to bring in videos that they knew would trigger their ASMR. They then watched the videos in an MRI, while indicating periods of ASMR with a button press."
ASMR is usually precipitated by stimuli referred to as 'triggers'. ASMR triggers, which are most commonly auditory and visual, may be encountered through the interpersonal interactions of daily life. Additionally, ASMR is often triggered by exposure to specific audio and video. Such media may be specially made with the specific purpose of triggering ASMR or originally created for other purposes and later discovered to be effective as a trigger of the experience.