What Split-Brain Patients Reveal About Consciousness
thereader.mitpress.mit.edu> When Mark pointed out this discrepancy, the patient commented that her left hand frequently did things on its own
That is the scary part. I would image it's like having a parasitic mind that sometimes controls half your body and sometimes just smooth along with what your 'talking' part of consciousnesses is doing.
Their lives and symptoms offer a rare window into how the brain binds experience into a single mind.