Being joined from birth, any and all memories and experiences formed in their brains that could be shared were shared, and so they would have similar associatio

Being joined from birth, any and all memories and experiences formed in their brains that could be shared were shared, and so they would have similar associations and mental pathways formed based on them. While it may be possible to learn and figure out patterns from someone else that you were connected to, I think it would be immensely difficult. You may have to learn the whole world from their point of view from scratch for any mental relations they communicate to have any meaning.