Today I will finish up on psychiatric procedures for depression. I will discuss bright light therapy, vagal nerve stimulation, transcranial magnetic stimulation, and cranial electrotherapy stimulators. Some of these are really cheap, others expensive; some are really invasive, some not at all. So there is a range of accessibility. Most of these are quite effective and adverse effects are generally pretty low. You're probably familiar with some of them and not with others, so take a listen and learn about how these work, how you can give to your patients, and what the evidence is for effectiveness.