Intranasal Oxytocin in Antiosocial Personality Disorder and Psychopathy

Inclusion Criteria: * Male * Aged 18-60 * IQ greater than 70 as defined by the Wechsler Abbreviated Scale of Intelligence (WASI-II). Violent offenders: Offenders with convictions for violent crimes (murder, rape, attempted murder, grievous and actual bodily harm) who met DSM-5 criteria for antisocial personality disorder (Structured Clinical Interview for DSM-5 Personality Disorders (SCID-5 PD) Psychopathy or non-psychopathy subgroup based on Psychopathy Checklist- Revised (PCL-R; (Hare, 2003))- score of 25 as the threshold for psychopathy in this English population. Healthy non-offenders: Non-offenders with no personality disorder Exclusion criteria: * history of major mental disorders (bipolar 1, bipolar 2, major depression or psychotic disorders) * self-reported neurological disorders * head injury resulting in loss of consciousness for 1 hour or longer * severe visual or hearing impairments * contraindications to MRI