Reconsidering Sadistic Personality Disorder: A Neurobiological and Forensic Framework for Non-Sexual Sadism

This paper proposes the re-establishment of Sadistic Personality Disorder (SPD) as a formal diagnosis, grounded in neurobiological and forensic evidence. While traditionally removed from diagnostic frameworks due to stigma and overlap with other personality disorders, current findings in neural circuitry, particularly regarding reward systems and emotional processing, reveal a distinct and non-sexual form of sadism. This variant, not driven by antisociality or psychopathy, includes emotionally reactive, calculated behaviors centered on deriving pleasure from others' suffering. We analyze functional brain regions, oxytocin resistance, and historical case profiles to distinguish sadism from adjacent disorders. Recognizing SPD could improve clinical diagnostics, risk assessments, and targeted forensic interventions.