M0 is base level, WHETHER.
M1 is the 1st mind, mind that knows, convergence.
M2 is the 2nd mind, the mind that asks, divergence.
M3 is the 3rd mind functional adjudication — one metaphor of this is like a Brake, Dam, Dial, Evaluator, etc...
One sense is that is 3 of 4. “How” goes to “What”. In that case, M3 holds a break, How shifts to What.
With the brake gone, goes from What to Whether.
What you DON’T SEE is what happens, with the unconscious build up (e.g. of emotion, surprise). That is part of the dynamic regeneration