Study interventions
blindness
BLINDNESS
A detailed description of the study interventions is given elsewhere ([For sham tRNS we used the same montage as in active tRNS, but here the 30 s of ramp up of the current from 0 to 0.75 mA was immediately followed by 30 s ramp down period to 0 mA, such that participants did not receive active stimulation between ramp-up and down. This method has been shown to provide effective blindness of the stimulation condition as both active and sham tES would lead to slight itching sensation that would disappear due to scalp habitation [