#$%^&*AU2018236820A120181018.pdf#####DEVICES AND METHODS TO USE POWER SPECTRUM OR SIGNAL ASSOCIATION FOR PAIN MANAGEMENT ABSTRACT An electrical stimulation system is disclosed, which com-prises a processor (410) configured and arranged to (i) obtain (602) a biosignal of patient, (ii) alter (604) at least one stimulation parameter of the electrical stimulation sys-tem in response to the biosignal, and (iii) deliver (606) an electrical stimulation current to one or more selected electrodes of the electrical stimulation system using the at least one stimulation parameter. In some embodiments, a power spectrum is determined (704) from the biosignal. In some embodiments, the biosignal comprises at least two different biosignals measured at the same or different locations on the patient and a coherence, correlation, or association between the two biosignals is determined (804).
