Study of Repetitive Transcranial Magnetic Stimulation (rTMS) as Adjuvant Treatment for Depression

Active 10 Hz rTMS will be applied to the left dorsolateral prefrontal cortex (L-DLPFC) with an intensity of 120% motor threshold. The L-DLPFC location is defined as that area 5 cm anterior to the motor cortex for activation of abductor pollicis brevis. Subjects will receive a total of 3000 stimuli per session. The TMS trains are 4 seconds on and 26 seconds off for a total of 37 1/2 minutes. Treatment will occur 5 days per week for up to six weeks. Subjects will be monitored during rTMS for any side effects or adverse events.