A new paper argues that the condition now known as “Dissociative Identity Disorder” might help us understand the fundamental nature of reality

Now, a newly published paper … posits that dissociation can offer a solution to a critical problem in our current understanding of the nature of reality. This requires some background, so bear with us.
According to the mainstream metaphysical view of physicalism, reality is fundamentally constituted by physical stuff outside and independent of mind. Mental states, in turn, should be explainable in terms of the parameters of physical processes in the brain.

Source: Could Multiple Personality Disorder Explain Life, the Universe and Everything?