I have always wondered if the two signature scenes in The Pang Brother's The Eye -- one involving a ghost in a classroom, the other involving an elevator -- came about because the filmmakers did some kind of scientific research as to how an exact sound (or image) can literally send the chills down your spine. So many people got the goosebumps from those scenes, at least as confirmed anecdotally by yours truly after the film took its North American premiere at a festival of seasoned horror veterans and midnight maniacs. I indulged in the mental image of the Pang's in white lab coats in some anonymous office interior trying out sounds like old Hitchcock for that extra physiological bump.
The term "Autonomous Sensory Meridian Response" (ASMR) is marked by a pleasurable tingling sensation often felt in the head. This can be triggered by anything from getting a haircut, hearing a paint brush against canvas, to listening to someone whisper. ASMR sometimes goes by the loose nickname of "brain orgasms" (personally, I like the magnificent moniker of Attention Induced Head Orgasm.)
Simply put, these names describe a tingly sensation around the head and scalp, caused by various triggers. Many people are unaware that such a phenomenon exists. Others experience the sensation regularly, but have no idea it possesses a defined title. In our internet / YouTube age, many people who experience their own ASMR moments find their own triggers via videos of people stroking cloth, beads, or simply by watching old Bob Ross shows -- I am serious, the dude is potentially the patron saint of ASMR release.
The documentary, Braingasm, is currently in production, and its teaser, well, teases with potential ASMR triggers.