Integrated Information Theory has a similar conclusion to what we reasoned about the split-brain patients: if you are a part of a system that gets connected into a much larger consciousness, your consciousness is subsumed. Like a smaller soap bubble merging with a larger one.
There can be no conventional “scientific” theory of consciousness because science can only describe and predict how nature behaves, not what nature is . The latter investigation belongs to the realm of philosophy, or more precisely, metaphysics. Bertrand Russell came to this observation already a century ago (Russell 2009).