 The aim of this study is to investigate the effects of non invasive brain stimulation - NIBS - techniques Electroconvulsivotherapy - ECT, transcranial Direct Current Stimulation - tDCS, repetitive transcranial magnetic stimulation - rTMS on serum Brain Derived Neurotrophic factor BDNF levels in patients with depression and schizophrenia. Four blood samples will be collected in each participants, one before the NIBS sessions, and 3 after the completion of NIBS protocols: one immediately after the end of the NIBS sessions, a second one week after and a last one month after. Two blood samples separated by one month will also be collected in a a group of healthy volunteers. 