Am empirical classification of psychopathic personality.

Personality profiles of 79 non-psychotic male offenders admitted to a security hospital were subjected to a cluster analysis. Four profile types were generated, classifying four-fifths of the sample, and differences were found between the types in previous antisocial behaviour. Two of the types were identifiable as primary and secondary psychopaths, while the remaining two showed little resemblance to the concept of the psychopathic personality. The primary psychopaths were extraverted but not neurotic, while the secondary psychopaths were neurotic, but not extraverted. Both were highly impulsive but distinguished by a dimension of sociability-withdrawal.