The psyche is like a dynamic living structure/circuit.
Its physical correlate might be the ‘nervous system’.
There is a variable amount of electricity/spirit that can be passed through the nervous system.
The self (ego/self structure) is the determiner of how much spirit (dynamic energy) should be received.
The brain is a reducing value rather than the creator of reality.
The brain is more of a focusing instrument.
The RAS(Reticular activating system) in the brain determines how much power/electricity/spirit must be passed through the nervous system – and this also correspondingly activates the psyche structure.
We could say the ego/self controls this RAS and uses this like a volume control to optimize output based on its goals.
The psyche structure has a circuit.
– If the wiring is very chaotic and silo like(i.e. there are multiple contradictions, conflicts, incompatible compartments, lot of split-selves(locus-es, clusters)), then there the self turns down the RAS to maintain circuit integrity and limit circuit connectivity.
– On the other hand, if the wiring is sound, well integrated, without any incompatible wiring, then the RAS can be comfortably turned up and the system can work more powerfully and efficiently without a short circuit and the parts can function coherently, harmoniously with minimum interference.
An important thing is remember is that, PAIN in essence is from conflict.
So depression is a protective mechanism against PURE PAIN.
Opiates are released in response to pain.
That is why depression and high opiate release are highly connected (which also explains why the depressed person feels a flat AFFECT and loss of memory access).
A depressed person has a lot of internal chaos and conflict.
[Conflicting values, conflicting drives, conflicting ideologies and so on]
This chaos and conflict creates pain.
Now, if greater energy is passed from the RAS through the conflicting circuits, then there could easily be a short circuit and something may blow up.
Whereas if the energy passed through the circuits is lowered, then only the critical circuits receive power, and large areas of potential conflict could be kept low-key and relatively dormant.
So depression kicks in, to make chaos manageable, to mitigate pain, and it is an attempt of the organizing system to handle one thing at a time starting from the most critical.
That is why sometimes LSD and Ayahuasca can cause violent reactions, because it would increase the circuit power and connectivity reach via. RAS, forcing disconnected, compartmentalized, and dormant parts to interact with each other, which could potentially cause a lot of conflict/chaos = pain.
But however if one wants to function as ONE integrated personality, then such a pain could be a good learning experience in terms of facing this chaos so that one could see through the transcendent principle behind it.
These transcendent principles thus seen can be used to integrate the disconnected parts.