2.2. Participants
MUD
DISORDER
Participants included 60 individuals (all-male, mean age ± standard deviation (SD) = 35.86 ± 8.47 years, ranging from 20 to 55) diagnosed with methamphetamine use disorder (MUD). They were recruited during early abstinence from the 12&12 residential drug addiction treatment center in Tulsa, Oklahoma as part of a clinical trial investigating the effectiveness of tDCS in reducing methamphetamine craving (ClinicalTrials.gov Identifier: NCT03382379). Further details regarding the inclusion and exclusion criteria can be found in the supplementary materials 