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The experience of feeling or seeing a double or your own body is called autoscopy or heautoscopy.
In a further recent paper published in Cortex, Peter Brugger and colleagues reviewed 14 cases of 'polyopic heautoscopy', where patients experience multiple doubles of their own body.
Metzinger briefly touches on four varieties of autoscopic (self-seeing) phenomena, all of which can be related to distinct areas of the brain: autoscopic hallucination, where the subject sees an image of themselves; the feeling of a presence, where the subject has the strong sense of someone there without seeing anyone; the particularly disturbing heautoscopy, where the subject sees another self and switches back and forth into and out of it, unsure which is 'the real me'; and the better-known