 LFMS will follow a previously published protocol for the treatment of a Major Depressive Episode Rohan et al. 2004. LFMS treatments will be delivered with a prototype LFMS device manufactured by Tal Medical. LFMS sessions consist of proton echo-planar magnetic resonance spectroscopic imaging EP-MRSI and will be 20min in duration. LFMS exposes subjects to magnetic fields of the same magnitude and frequency used in clinical MR-Spectroscopic imaging of the brain. Sham LFMS will consist of a three-dimensional spoiled gradient echo sequence of the same duration as active LFMS and which provides auditory stimulation indistinguishable from active treatment. 