The most popular source of stimuli reported by subjects to be effective in triggering ASMR is video. Videos reported being effective in triggering ASMR generally fall into two categories: intentional and unintentional. Intentional media is created by those known as "ASMRtists" to deliberately trigger ASMR in viewers and listeners. Unintentional media is that made for other reasons, often before at
tention was drawn to the phenomenon in 2007, but which some subjects discover to be effective in triggering ASMR. Examples of unintentional media include British author John Butler and American painter Bob Ross. In Ross's episodes of his television series The Joy of Painting, both broadcast and on YouTube, his soft, gentle speaking mannerisms and the sound of his painting and his tools trigger the effect in some viewers.[38][39] The work of stop-motion filmmaker PES is also often noted.
