In Indian ideas on psychology and meditation, a state of cessation of thoughts is envisaged..
Even for the theories of conscious and subconscious and superconscious states enumerated by western psychological theories, we have no concrete evidence.. and there can be no concrete evidence in this matter because the measuring rod is the mind and the thing measured too is the mind..
There can be theories at macro levels..
But in very subtle matters only experiences.. can guide.. and the recording or documentation of such experiences can vary, and can be faulty too.. The error factors abound.
But the research by Indian seers on the mind and thoughts advanced to dizzying levels of insights eons prior to the time when even the existence of the art and science of psychology was faintly recongnized by others..
Even in physics,,( I mean the most advanced western science of theoretical physics) whether enegy gets transmitted in waves of electrical and magnetic variation or whether the energy is transmitted in disjointed quanta is not yet certain.
So if we take cue from that uncertainty principle, even if there is a subconscious mind, how can we be sure that that subconscious mind is functioning continuously in in periodic bouts of activity and inactivity?
Suffice to say that the Indian thought system gives great stress to quiscent state of mind.. bereft of all activity.. And the Yoga.. the chittavrittinirodha .. of patanjali and others aim at that state.