Objective: The current study aimed at comparing preventive behavioral mechanisms behavioral tendencies, and the clash between drug users under maintenance treatmentandnon-users. Method: It was a causal-comparative study. All addicts of Esfahan city who had referred to one of the drug quitting centers constituted the study population. The selected sample consisted of 50drug users under maintenance treatment and 50non-users who were selected by convenience sampling. Gray- Wilson Personality Questionnaire was used for data collection purposes. Findings: The results showed that there was a significant difference between the two groups in terms of BAS and FFS scales while the difference between the two groups in terms of BIS scale was not reported to be significant. As well, there was a significant difference between the two groups in terms of approach, passive avoidance, fight, and silence. Conclusion: Investigating the neural/behavioral foundations within the range of substance abuse disorders indicates a difference between this group and those without the disorder, and it can further our understanding of the neural foundations of these disorders.

Keywords: Neuro Behavioral Mechanisms, Addiction, Maintenance Treatment

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