Participants
We recruited 103 healthy participants at Massachusetts General Hospital (MGH) from September 2016 to March 2019. Twenty-two participants were dropped from the study: 18 before randomization and 4 after randomization due to scheduling issues or a device error (3 from the cathodal group, and 1 from the sham). The final number of participants was 81 (37 females, mean ± SD age: 27.4 ± 6.4), with 27 participants in each of the three tDCS groups.The study was approved by the MGH Institutional Review Board. Informed consent was obtained from all participants. Please see our previous publication for more details (