I've entertained myself with quite a few fun thought experiments about consciousness recently, and here is one example that's inspired by split-brain patients.
Imagine that you have a way to disconnect/reconnect the two hemispheres of a brain by flipping a switch. What would it be like from the brain's perspective?
From what we know of split-brain patients, an individual hemisphere can be independently conscious when separated from its partner. So when you disconnect two hemispheres, each would continue to be conscious, albeit with a subset of its original senses, memories, and processing capacity.
So you'd go instantly from a single, unified consciousness to two completely independent consciousnesses. Each hemisphere would have an unbroken experience of being conscious, perhaps experiencing a "dimming" effect when it's disconnected from the other hemisphere. Each hemisphere would be "dumber" than the original unified consciousness, and might experience monocular instead of binocular vision as well as mono audio instead of stereo.
Now imagine what would happen when you reconnected the hemispheres.
Each hemisphere would suddenly feel more intelligent and regain its original sensory capabilities. It would be opposite of the original "dimming" effect - perhaps more like a "brightening" of the world. Monocular vision would become binocular, and mono audio would become stereo.
I spent an hour lying on my bed trying to imagine the process from a particular hemisphere's perspective. I'd cover up one eye, cover up an ear, and pretended to forget certain facts and skills. Then I'd uncover the eye and ear, and experience "fullness" again.
This thought experiment underscores the relation between consciousness and integration. When two hemispheres are integrated, they form a single, unified mind and a single consciousness. When they're separated, they form two simpler minds, each with its own consciousness. And since the process is reversible, it's possible to recombine the two minds/consciousnesses into one.
And it's this thought experiment that led me to an alternative theory for subconsciousness.....