Background and Aim : Self-motivation is a concept refers to a person's ability to create and maintain motivation to change behaviors and achieve goals. In the context of addiction, self-motivation can have a huge impact on the success or failure of drug withdrawal. Today, the prevalence of drug use has led researchers to investigate the various dimensions of harm and its consequences. Psychological factors related to drug abuse are of great importance. One of the important variables in this field is self-motivation. In this context, the use of research has shown that the use of neuromodulation techniques such as direct brain current stimulation (tDCS) can have positive effects on improving psychological functions. This study examines the effect of tDCS on self-motivation deficits in drug addicts. Methods : This research was a quasi-experimental study with experimental and control groups. Its statistical population included those who referred to one of the addiction treatment centers located in the north of Tehran. A group of 15 individuals voluntarily participated in this research (5 with and 5 without tDCS, and 5 healthy subjects). All 3 groups responded to Barkley deficits in executive functioning scale (BDEFS for Adults). The tDCS applied over the dorsolateral prefrontal cortex (DLPFC) (anodal stimulation of F3 region, and cathodal stimulation of F4 region with a current start of 2 mA) for 5 weeks and 3 sessions every week, only the experimental group received this Results : The results of multivariate analysis of variance (MANOVA) showed significant differences between 3 groups in Self-Motivation, healthy subjects revealed better performance than two other groups, and the group with tDCS was significantly better than the group without tDCS (p<0.5). Conclusion : It could be said that tDCS has an effect on improving the psychological aspect of daily life in substance abusers.
