Background and Objectives: According to dimensions of mental disorders and researches focusing on mental disorders in the general population, the relationship between alexithymia, positive affect and negative affect with mental disorders has been investigated in this paper.Materials and Methods: for this study, 300 students were randomly selected from Razi University. In order to gather the data, questionnaires of sq_90, alexithymia (FTAS-20) and scale of positive and negative effects (PANAS-X) were employed. For data analysis, statistical indices such as correlation and regression were used.Results: The results obtained from the data analysis showed that there is a significant and positive correlation between Alexithymia and negative affect with mental disorders. It was found that there is a significant and negative correlation between negative affect and mental disorders.Conclusions: The results indicated that Alexithymia and negative affect can predict mental disorders; however, positive affect is not able to predict the mental disorders. Conclusion: Based on the results of this study, the Alexithymia and negative affect have a negative role in mental health.

Factor analyses that have beel1 administrated on the self-report mood questionnaires, consistently emerged two dominant dimensions that are called positive and negative affects. These two affective dimensions are associated with different classes of psychological variables. negative affect is related to self-reported stress, poor coping, health complaints, and frequency of unpleasant events. This dimension is the common factor of anxiety and depression disorders. Positive affect is related to social activity and satisfaction and the frequency of pleasant events. Low positive affect is the specific factor of depression. In this study the Positive affect and negative affect Scale (PANAS) was administrated on 255 university students with anxiety and depression disorders. The accuracy of factor structure, construct validation, and reliability of the PANAS was evaluated by Confirmatory Factor Analysis (CFA) and Structural Equation Modeling (SEM). The scales are shown to satisfy the two factor model (p<0.01). The structural relation of negative and positive affect with anxiety and depression was consistent with previous studies (p<0.05). The reliability of subscales were 0.87.

Regarding to this issue that scientific reliable results have been not possible without precise tools, present research has been done to examine psychometric properties of positive and negative affect (PANAS). with the use of random-cluster method 527 students from Azad university in Tehran were selected and answered to the PANAS. this scale consisted of 20 items and has been graded based on 5 point likert spectrum. After performing exploratory factor analysis and principal component analysis using varimax rotation performed, finding indicated that factor structure of the scale has two dimension and the factors predicted 43.631% of total variances. the internal consistency is 0.777. Two kind of norms were prepared, percentage wise norm and category wise norm. Based on conclusion of this study PANAS has acceptable validity and reliability so is proper to use in Iranian samples.