1. A system for modulating a patient's neurological disease state, the system comprising: one or more sensors that sense at least one signal that comprise a characteristic that is indicative of a neurological disease state; a signal processing assembly in communication with the one or more sensors that processes the at least one signal using a disease state processor to estimate the neurological disease state and to adjust a parameter of a therapy to the patient as a function of the estimated neurological disease state; a treatment assembly in communication with the signal processing assembly, wherein said treatment assembly delivers the therapy to a nervous system component of the patient; and a patient interface module that communicates with a patient the estimated disease state, said patient interface module being in communication with the signal processing assembly and external to the patient's body.