^^ frequency in music. subconscious repetition, or setting the glial cells of the brain to specific light formations, ie., subliminal programming, using long term potentiation of neurons, or memory formation. triggers can happen thru people's actions, scenarios/ situations, dreams, songs, TV, etc. because it is based on a seed, and inside the mental seed are connections to fantasy and insecurities that flash through the subconscious causing a reaction. much like malware.

Man Sings Eminem Song While Killing Family!
[link to www.youtube.com (secure)]

example of a vector: (Dailymail is an aversive mind control technique/ subconscious psychic driving-flash)

Mind control is possession.