In turn, no significance was found when including tDCS protocolin the model, showing that changes in HRV might not be associated with individual E-field variability in brain regions of interest (Table 2). E-field head models are presented in the Sup. Material - Appendix 8.
Table 2. Mixed effects model outcomes controlled by ‘tDCS protocol’ showing no association between E-field strength in the brain regions of interest and HRV modulation.