The purpose of present study was to compare perfectionism, negative affect and brain-behavioral systems in individualsl with and without bulimia.  To achieve this, of treatment center clients, 70 bulimia nervosa patients were selected through purposeful sampling,.Furthermore,70 normal persons were selected through purposeful sampling who were matched with the control group in terms of demographic characteristics. To collect the data, the Hewitt and Flett multidimensional perfectionism scale, Hed depression and anxiety scale and Carver and White’s brain-behavioral systems questionnaires were used. Data were analyzed by multiple analysis of variance  (MANOVA). Results revealed that there was significant difference between patient group and normal group in perfectionism, negative affect and brain-behavioral systems.Furthermore, Bulimia nervosa patients, in comparison with normal group, reported higher levels of perfectionism, negative affect and BAS. Also normal group showed higher level of BIS in comparison with bulimia nervosa patients.

Keywords: Perfectionism, Negative Affect, Brain- behavioral systems, Bulimia nervosa