A Single Blind Study of Cranial Electrical Stimulation in Bipolar II Disorder

The purpose of this study is to assess the antidepressant effects of Cranial Electrotherapy Stimulation (CES) in the depressed phase of bipolar II disorder.; to examine the safety of daily CES in bipolar II patients; and to examine the effects of 20 minutes of daily CES on EEG reading. The investigators hypothesize: 1. The CES will reduce symptom severity more than sham (placebo) CES. 2. That CES administered for 20 minutes daily for four weeks is safe and well tolerated when treating bipolar II patients. 3. That CES will shift the alpha and beta power fractions of EEG downward, and that this shift correlates with a decrease in level of anxiety and depression