The purpose of this study was to develop and test a causal model of students' tendency to addiction based on differentiation through alexithymia and responsibility. The research method was descriptive and correlational. The statistical population of the study included all undergraduate students of Azad University units in Tehran in the academic year of 2018-19. Cluster sampling was used to select the sample under study, with 350 students being selected as the sample group. Research instruments included the the Wade and Butcher Addiction Scale (1992), the Toronto Alexithymia Scale (1994), the Scorn and Friedlander Differentiation Scale (1998), Nemati Responsibility Scale (1387). They were. Descriptive (mean, standard deviation, tilting and elongation) and inferential (structural equation modeling) methods were used for data analysis using SPSS and Amos software. The results of the measurement model analysis showed that the factor structure of the research scales was acceptable. The results of the conceptual model test indicated that the fit indices of the research model were in good condition. The hypothesis regarding the indirect effect of differentiation on students' tendency to addiction through alexithymia and responsibility was confirmed (p <0.05). The findings of the study indicated that the conceptual model of the research was appropriate. Accordingly, in addiction treatment clinics, attention to antidepressant antecedents and differentiation is necessary to reduce the level of tendency to addiction. . Subsequent results of the study showed that the hypothesis regarding the indirect effect of differentiation on students' addiction tendency mediated by emotional malaise and responsibility was rejected by 95%.
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