Jeanette Kennett

The condition known as Multiple Personality Disorder (MPD) or Dissociative Identity Disorder (DID) is metaphysically strange. Can there really be several distinct persons operating in a single body? Our view is that DID sufferers are single persons with a severe mental disorder. In this paper we compare the phenomenology of dissociation between personality states in DID with certain delusional disorders. We argue both that the burden of proof must lie with those who defend the metaphysically extravagant Multiple Persons view and that there is little theoretical motivation to yield to that view in light of the fact that the core symptoms of DID bear remarkable similarity to the symptoms of these other disorders where no such extravagance is ever seriously entertained.

We have argued here that to attribute criminal responsibility to psychopathic individuals is to ignore substantial and growing evidence that psychopathic individuals are significantly impaired in moral understanding. They do not appear to know why moral transgressions are wrong in the full sense required by the law. As morally blameless offenders, punishment as a basis for detention cannot be justified. Moreover, as there are currently no successful treatment programs for psychopathy, nor can detention be justified on grounds of treatment. Instead, we argue detention on the grounds of self- defence, due to the severe and continuing threat posed by the psychopathic criminal.

We have argued elsewhere that moral responsibility over time depends in part upon the having of psychological connections which facilitate forms of self-control. In this chapter we explore the importance of mental time travel - our ordinary ability to mentally travel to temporal locations outside the present, involving both memory of our personal past and the ability to imagine ourselves in the future - to our agential capacities for planning and control. We suggest that in many individuals with dissociative disorders, forms of amnesia, or other frontal lobe damage, our capacity for mental time travel is impaired, resulting in commensurate losses to agency autonomy, and a forensic condition essential for holding persons responsible: in legal terms, the capacity for mens rea.