Serial killers tend to score highly on a scale of psychopathy, ticking boxes such as low empathy and glib superficial charm. Another condition that can be tapped to derive insights is anti-social personality disorder (APD). Some reports of the experiences of lust killers point to a split in individual consciousness, sometimes expressed as good versus bad personalities. There can be a sudden flip between these states. This is sometimes conceptualized as dissociation and can be revealed as ‘voices in the head’. It is distinct from psychosis and has not been successful as a plea for mitigation. Characteristics of dissociation include viewing oneself from a distance, having a poor or no memory of the killing (i.e. memory specific to the state at the time of the killing) or seeing a disliked person as the target of the attack. Some serial killers are diagnosed as psychotic.