Buddhists have a much broader definition of what constitutes 'experience', based on the experience arising from the jhanas. Even though Buddhists themselves wouldn't describe those states in terms of 'the supernatural', the Buddha himself is described as 'lokuttara' translated as 'world-transcending'. And the jhanas clearly exceed the boundaries of what would pass for 'empirical experience' in the modern sense. — Wayfarer
Would the jhanas not be states of mind or concentration, rather than experience or perception of any particular thing? Empirical experience or perception is characterized by being of publicly available objects. Dreaming is a state of mind that one might call "world-transcending', but it is a temporary state. If samadhi states are sustainable, or even may become permanent, then this would count as world-transcending in the sense that worldly experience is dualistic, or at least understood dualistically. I think our ordinary experience is non-dual and that it is the experience of duality which is a kind of illusion: "samsara is nirvana".
What you behold is a comprehensive display of the things before you, and this display is given to you as a single, undivided experience.
Everything is not seen at once; the eye flits around in ordinary waking consciousness, noticing this, then noticing that, so I'm not sure what is meant here by "single, undivided experience". There may be "gaps" where nothing is noticed in between noticing particular things, but there seems to be no breaks in the sense of being totally unconscious conscious ( except in deep sleep states or anaesthesia), no moments where there is absolutely no awareness of anything at all, whether external phenomena or bodily sensation or emotional response, so perhaps that is what is meant.
Yet you can say that it is within this domain of the subjective unity of experience, that we 'make sense' of experience. Isn't this where the observation of cause and effect actually takes place? Isn't this the domain in which order is sought and connections are made? And where is that domain? Is it 'out there', in the world, or 'in here' in the observing mind? Or both? Or neither? Not claiming to have an answer, but I think it's an interesting question. — Wayfarer
So, I can't think what "the subjective unity of experience" could mean other than that we have a sense of continuity of awareness, and in relation both to the world of objects and bodily sensations, there is a general sense that everything "fits" into an overall conceptual web of relation between the self and other things and processes, both external and internal, due to an experienced impression of familiarity. Psychedelics can break down that ordinary sense of familiarity, a sense which after all is a kind of culturally acquired illusion.
To me the "in here" and 'out there" dichotomy stems from the ordinary understanding of being a sensate body in a world of sensed objects. The "internal sensations belong to the body, and what are perceived as objects in the environment are perceived as external to the body, since the body is experienced as being in a world or environment, and we can feel our bodies "from the inside" so to speak, but we cannot ordinarily feel objects from the inside..
Much more beyond this basic understanding could be said about this difficult topic, and this is precisely the domain of phenomenology as I understand it. On the other hand all phenomenological analysis can give us are different perspectives from different starting points or assumptions, and all such perspectives are going to be dualistic in character and will have their own aporias. I think this is because all discursive dualistic understandings of what is intrinsically non-dual must be, in the final analysis, aporetic. It's like trying to chase or even eat your own tail; and a fitting symbol of this is the Oroubouros.