Randomization and Masking
Following baseline visits, participants were randomized (1:1:1) to meditation training, non-native language training, or no intervention arms. Randomization was performed according to a randomization list with permuted blocks of varying size, which was generated centrally by a biostatistician. All study personnel were masked to treatment allocation. Only intervention facilitators, trial-independent statisticians, and data monitoring infrastructure staff were unmasked or partially unmasked.