Karpman believes that the group designated as 'psychopathic' contains a variety of personalities which have little in common beyond a particular from of behavior and a superficial resemblance in certain personality traits. The dynamics in these cases, which superficially appear alike, may be vastly different. He distinguishes two basic groups on the basis of motivation: the secondary or symptomatic and the primary, idiopathic type of psychopathy. The symptomatic type, upon closer examination, discloses individuals with neuroses or psychoses wherein the psychopathic behavior obscures the basic neurotic or psychotic picture. The idiopathic psychopathy, on the other hand, is a specific type which, in its extreme forms, constitutes a specific mental disease requiring institutionalization. Two fairly distinct subdivisions of the idiopathic group can be delineated, the aggressive-predatory type and the passive-parasitic type.