A trial combining mindfulness and brain stimulation reported improvements in executive tasks and craving among young adults. Favorable combination results do not, by themselves, establish that the treatments interact synergistically.
Alizadehgoradel and colleagues randomized 80 early-abstinent methamphetamine users aged 18–21 to four groups: active transcranial direct current stimulation, mindfulness-based substance-abuse treatment, their combination or sham stimulation. Each group initially contained 20 participants. The protocol involved 12 stimulation sessions and twelve mindfulness sessions where assigned. Outcomes were assessed immediately afterward and at one month.
The combined group improved on most executive-function tasks compared with baseline and sham. Craving declined in the active treatment groups but not sham, and changes in executive measures and craving were correlated after combined treatment. Those observations support investigating the combined intervention. A correlation between two improvements does not show that the executive change caused the craving change. Similarly, combination-versus-sham superiority is different from a formal test that the combination exceeds the expected contributions of its components.
The sample was restricted to a narrow age range and early abstinence. One-month follow-up does not establish durable recovery, and the study lacked imaging to demonstrate the proposed brain changes. The intervention was mindfulness and stimulation, not a controlled stimulant-dose experiment. Laboratory performance and craving scales cannot be converted into a measure of individual intoxication or a prediction that a participant will remain abstinent. Claims about mechanism, treatment interaction and relapse prevention each require their own direct evidence rather than being inferred from a favorable overall pattern.
See a single-session stimulation trial with a null craving comparison for a different study and outcome.