A certain subclass of brain events is consciousness. These consciousness events do cause chain reactions on other events in the brain creating the physical states associated with meditation.
I wonder whether your claims are not results of chain reactions of sub sub class of brain events, absolutely lacking the basis for determining the truth position of a proposition.
How can the so called understanding arisen of a process control and know the process?
What you say merely flows from your axiom that chemicals/brain events cause consciousness. You refuse to even consider the proposition that mind states control what brain chemicals make us feel.
There are published records that meditators can consciously activate different brain areas.