In November of last year, Jan Scheuermann did something she never thought she would do again: She fed herself a piece of chocolate. For the last decade Scheuermann, 54, has been a prisoner in her own body. She suffers from a mysterious degenerative disorder that attacks the nervous system, severing the connections between the brain and muscles.Now a quadriplegic, Scheuermann has no movement below her neck. She cant move her limbs, let alone grasp, move, or hold anything. Until shes hooked up to a brain-computer interface (BCI).