Changes in band specific power following DBS.

<p>A) Representative power spectra from all subjects in month 1 post-operatively. Recordings were taken before DBS was administered. B) Power spectra from all subjects late in the study (Months post-op for TS1 = 14, TS2 & TS4 = 5, TS3 and TS5 = 6). Months were chosen to represent the maximum gamma power. Changes in frequencies after prolonged DBS therapy are most prominent in the gamma range. All recordings taken from channel 4 (across contacts 1 and 4) in the right hemisphere in subjects with two unilateral devices or channel 1 (across contacts 1 and 2) in subjects with a single bilateral device.