Recurrent Depressive Disorder, Current Episode Severe Without Psychotic Symptoms

An 8-week, two-armed, randomized-controlled trial that examines the antidepressant effect of treatment with transcranial pulsed electromagnetic fields (T-PEMF) in patients diagnosed with moderate to severe depression using using a new device, the MoodHeadBand (MHB). The participants will use an active or placebo MHB for 30 minutes daily for 8 weeks. Additionally, the following research questions will be answered: 1\. If there is a positive effect on the patients' emotional and non-emotional cognition after 8 weeks of active treatment compared to the sham group and if possible early changes in the emotional cognition can predict the treatment response after 8 weeks of treatment. 1\. If the T-PEMF treatment provides improvement in restorative sleep after 8 weeks of treatment