I didn't watch the whole video but I've been reading and watching about severed Corpus Callosum patients (split-brain) and how they provide a good insight into our brain.
What is most interesting is that one part is specialized in making sense of observation even when the explanation they give doesn't necessarily has any relation to what they observed.
There are some videos out there which you might want to watch. It is interesting to see how the right hemisphere sees something but can't describe it because it doesn't get that information from the left but amazingly, it can draw what it perceived.
These sort of discoveries tell us quite a lot about how our brain works and that the thing we call Self, is quite dependent on an accurately working brain.