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Introduction: Depression is considered as a disorder that students have a susceptible environment for it and is affected by many factors. Therefore, the purpose of this study was to determine the role of satisfaction of basic psychological needs and family functioning by interdisciplinary role of emotion regulation difficulty in the prediction of depression. Methods: The method used in the study is descriptive approach by structural equation modeling. The sample consisted of 452 (207 boys and 245 girls) students universities Tabriz who were selected using multistage cluster sampling. Then, they filled out depression Questionnaire, satisfaction of basic psychological needs, family Assessment Device and Difficulties in Emotional Regulation Scale. Data were analyzed by using Pearson correlation coefficient, cronbach alpha and structural equation modeling. Results: The results of the study showed that the goodness of fit index (GFI), adjusted goodness of fit index (AGFI), comparative fit index (CFI), is greater than 0.90 and root mean square error of approximation (RMSEA), and root mean square residual (RMR) index is less than 0.05. Therefore, the proposed model has had a very suitable fitness with data. In this study, the most direct effect is the satisfaction of basic psychological needs on depression with a coefficient of -0.38 and satisfaction of basic psychological needs has the most indirect effect through emotion regulation difficulty on depression with a coefficient of -0.12. Conclusion: Based on the results of the present study, it can be concluded that Difficulties in Emotional Regulation As a Mediator of the Relationship between satisfaction of basic psychological needs and family function can explain depression in College Students and, thereby, attention to this matter can lead to the proposal of some recommendations for depression in College Students prevention and treatment.

Background: Motivation is an important factor in the substance use field. Self-determination theory is one of the theories that focuses specifically on the issue of motivation in substance use disorder and basic psychological needs issue. Objectives: The present study aims to evaluate the satisfaction of basic psychological needs in addict persons in comparison to normal persons. Methods: In this case-control study, 93 drug addicts and 91 normal people were selected through available sampling method by matching age, gender, educational level, and socioeconomic status, and evaluated using a basic psychological needs scale. Results: The results of multivariate analysis of variances showed a significant difference between two groups in the three basic psychological needs of autonomy, competence, and relationship (P < 0.001). Also, drug abusers received far fewer scores in three basic psychological needs. Conclusions: The results of this study highlight the weakness in satisfying the basic psychological needs of drug addicts that play an important role in the majority of aspects of each person’s life. Considering this problem, constructive suggestions may be provided for prevention and interventions based on this theory in the field of addiction.