I've done a lot of trance meditation in the past and the description of the video nails how it works precisely. You lower the amount of sensory input the brain

I've done a lot of trance meditation in the past and the description of the video nails how it works precisely. You lower the amount of sensory input the brain is getting and eventually the outside world drowns out and the brain is free to manufacture experience all by itself. With conscious direction you can 'do' some really cool stuff.