It is possible that single-attention-grabbing-thought lmitation is a limitation that can be overcome by learning (maybe this learning can be helped by temporary split-brain?). Some people claim to be able to partially overcome this limitation; it can be explained away as very fast switching, but as every thought has some background afterglow, very fast switching versus parallel thinking can be hard to distinguish.

I wonder what would happen in the end of merging of a temporary split - merging two minds can pass through a mostly-single-mind with two attention processes.