The aim of present study investigated the mediating role of positive and negative affect in the relationship between systems of brain/behavioral and alexitimiya. 277 students (121 males and 156 females) was selected from Kharazmi University through multistage cluster sampling and completed Jackson^,s five factor, Positive and Negative Affect (PANAS), Alexithimiya questionnaires. Data were analyzed using multiple regression. The results showed the behavioral activation/inhibition system positively can predict Alexithymia. Also the positive and negative affect play a mediating role in the relationship between systems and alexithymia. The model obtained is appropriate for explaining alexithymia.

Keywords: alexithymia, Positive Affect, Negative Affect, Behavioral Activation System, Behavioral Inhibition System