“…Vialatte, Maurice, Dauwels, & Cichocki, 2010). However, the underlying mechanism of SSEPs, is still 57 debated (see Zoefel, Ten Oever, & Sack, 2018). While some studies report evidence for entrainment 58 of ongoing brain oscillations by showing an interaction between stimulation and endogenous activity 59 (Notbohm, Kurths, & Herrmann, 2016;Schwab et al, 2006), others found responses to be nothing 60 more than regular repetitions of evoked neural potentials (Capilla, Pazo-Alvarez, Darriba, Campo, & 61 Gross, 2011; C. Keitel, Quigley, & Ruhnau, 2014).…”