It's complicated. Corpus callosotomy, also called commissurotomy, to relieve seizures was not designed for the purpose of creating completely non-communicating

It's complicated. Corpus callosotomy, also called commissurotomy, to relieve seizures was not designed for the purpose of creating completely non-communicating hemispheres. Every patient is different. And so on. There is a long list complicating factors and a longer list of possible factors. My guess is that it adds up to it being really difficult to make two truly separate consciousnesses, and that observations of these patients see interesting effects but they are still one mind.