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Virtual Reality: SAO
Sword skills etc. are just activated by movements such as the "swipe-down" feature of SAO. Everyone wants it, how to get it?
Simple: We find how to affect the brain and make it see stuff using electrical signals to influence what the body feels. This would mean you can simulate the feelings, with the signals sent to your body being stopped by some sort of bands you wear around parts of your body so only your head can move.
It will detect when you need to turn around by reading the signals to see if your body wants to turn to turn your in-game view/body.Virtual Reality: SAO