Introduction:Psychopathy is compilation of emotional, interpersonal and behavioralPsychopathycharacteristics which represents callousness, fearlessness, deceitfulness, grandiosity, impulsiveness, excitement seeking and aggression.The triarchic model of psychopathy that characterizes this disorder based on three boldness, meanness and disinhibition constructs was advanced with aim of integrating different and contrasting historical approacheswas developed toward assess psychopathy.Aim of this study was to investigate role of Brain-Behavioral Systems in psychopathy disorder based on triarchic model of psychopathy.

Method: In a causal correlation non-experimental design in form of structural equation modeling, 450 prisoners of various crimes in Urmia Central Prison was selected based on stratified random sampling method and triarchic measure of psychopathyas well as Carver and White’s BIS/BAS Scales were administered. Data were analyzed by using structural equation modeling with maximum likelihood estimation.

Results: Finding showed that theoretical model has good fitness.Also FFFS had significant positive effect on boldness and had significant negative effect on disinhibition and meanness. BAS had significant positive effect on boldness, disinhibition and meanness and BIS had significant positive effect just on boldness and had no significant effect on disinhibition and meanness.

Conclusion: The results of this research approved role of Brain-Behavioral Systems in explaining triarchic model of psychopathy and showed that Reinforcement Sensitivity Theory had been tremendous influence on development of theoretical and research etiology of psychopathy and supported major role of behavioral activation system in psychopathy disorder.

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