The body is like a million pressure sensitive key piano

If there are a million chemicals/neurotransmitters in the body,
Then who/what is the player of this hardware?
Is it prana? And the prana is controlled by the mind?
The mind is controlled from the intellect/knowing?
And then there is the blankness of deep sleep?
(using terms from the vedantic model)

GROSS:
So there is a physical form in the physical world.
SUBTLE:
There is a pranic form in the “pranic world/astral world”.
There is a mental form in the “mental world”.
There is a intellect form in the “intellect world”.
CAUSAL:
There is deep sleep dormancy of the seed, “causal world”.

So influences are transmitted from:
Deep sleep -> Intellect -> Mind -> Prana -> Physical body.
Through the 5 koshas (vedantic term).
So life force seems to be progressively cut off,
Until only one personality finally manifests in/as experience.

There are also various thresholds for activation in the brain areas.
Levels of activation: Say from RED/YELLOW(highest) to GREEN(moderate) to BLUE/VIOLET(lowest)
Like for instance, in PTSD, tiny cues may cause a lot of unpleasant areas to activate.
And if you repress something, then only a very high stimulus will make that portion activate.