a controversial subject amongst the religious and philisophers alike. whether our reality is purely neuro-chemical or something more complex.
my view is that it behaves like a purely neuro-chemical effect, so why go any further.
when you practice controlling the pictures you show yourself and the way you talk to yourself in your head.........and the content of the external media as well........you then, over time, begin to alter yor brain chemistry.
your minister knows this, the yogi knows this and so do the good folks who control the media, so lets grow up and take our minds back.