“…In order to establish protocols for clinically relevant long-lasting effects, an ongoing effort of research has been dedicated to exploring the effects of repeating stimulation, either by applying stimulation daily over several days or weeks, or repeating stimulation within a single daily session, separated by a critical time window. In general, repeating stimulation over multiple days has demonstrated efficacy in various clinical applications, such as treatment of bipolar disorder, pain and depression for tDCS (Sampaio-Junior et al, 2018;Kuo et al, 2014;Sampaio-Junior et al, 2018), as well as treatment of depression using rTMS (Rapinesi et al, 2015a;Senova et al, 2019). In fact, the number of repetitions may even play a decisive role, as in one study, it was found that at least 4-6 weeks of daily rTMS over left DLPFC was required to induce significant clinical improvement by active compared with sham TMS (O'Reardon et al, 2007), whereas a parallel study which performed rTMS for 3 weeks found no difference in response between active and sham rTMS (Herwig et al, 2007).…”