Regarding emotional and affective states, tDCS has been well-studied for the treatment of patients with Major Depression, with improvement in depression scores and response rates supported by recent meta-analyses (Cohen's d = 0.74; Odds Ratio 2.44) (Brunoni et al., 2016) and (Hedge's g = 0.37; Odds Ratio 1.63) (Shiozawa et al., 2014). In heathy, non-depressed individuals, one study from Boggio et al. (2009) has shown that 3 min of anodal tDCS to the DLPFC significantly reduced ratings of unpleasantness in subjects exposed to distressing images compared to sham stimulation (Cohen's d = 0.88). Petrocchi et al. (2017) also demonstrated an increase in soothing positive affectivity (Cohen's d = 0.57) and an increase in HRV (Cohen's d = 0.26) after 15 min of 2 mA tDCS over the left temporal lobe compared to sham stimulation. However, other studies found no effect in improving the mood of healthy volunteers. It is worth mentioning that these negative studies explored the effect of a single (Morgan et al., 2014) or less than five sessions (Motohashi et al., 2013) of stimulation, and these very same studies raised the question of whether several consecutive sessions are needed to achieve mood-improving effects in non-depressed subjects. In addition, there have been no studies to our knowledge that applied tDCS as a preventive strategy to prevent future mood reductions.