Described as bearing a "pronounced heredity burden", the propensity for<unk>  has also been suggested to be passed only through the maternal genes. Only able to offer "primitive reactions" and "poor and immature judgement", they are noted to display an absolute lack of purpose in their lives "except for the simple biological need to continue living". Gustav von Bergmann, a specialist in internal medicine rather than psychiatry, wrote in 1936 that<unk>  was entirely biological rather than fostered through psychological experiences. Indeed, Dr. Hans Luxenburger proposed in 1939 that a toxin in the metabolism, when present with<unk> , might be responsible for asthenic difficulties such as shortness of breath, nausea, and cluster headaches. Dr. E.H. Hughes noted that two-thirds of Huntington's disease patients had previously been diagnosed as<unk>  or Gemütlose psychopaths. A study in 1949 of different psychopathies under examination by electroencephalography recordings showed that borderline<unk> es and<unk> <unk> es had increased levels of dysrhythmia, whereas other subtypes of psychopathy did not show variation. An individual in 1931 was noted as having initially improved but relapsed "because of encephalitis". As with other<unk>  disorders, a 1923 article suggests it can also be acquired through encephalitis. In 2006, an Essex warehouse employee who suffered head injuries was awarded £3 million compensation on the basis it had caused him to develop<unk> , seeking out prostitutes and pornography which destroyed his marriage. Dr. W. Blankenburg posited in 1968 that those with<unk>  exhibited less categorical orientation than those patients who were simply unstable. By 1962, lobotomy was being tested as a possible means to limit the chaotic thinking of the<unk><unk> . Kraepelin, in noting "an increased risk of criminal behavior", estimated that 64% of men and 20% of women with<unk>  descended into alcoholism in the early twentieth century. The frequent intersection between HLPD and alcoholism means modern clinical researchers may use<unk> " as a grouping when separating subjects by disposition. Research in 1915 noted an increased propensity for lavish spending, and overconsumption of coffee, tea and medication. One 1954 study suggested female<unk>  patients may experience "manic excitement" during their menses. According to 1949 research, they have a higher rate of homosexuality, and 1939 evidence suggested that masturbation is more prevalent in<unk>  and Gemütlose (compassionless) psychopaths than in other disorders, and<unk>  erethics leave them "usually very sexually excited" and seeking out "atypical, irregular and unusual" debauchery whether in brothels, adultery or destroying marriages. They demonstrate similarities to hysteroid dysphoria. In 1928, it was proposed that Fantasy prone<unk>  was likely a subset of<unk> <unk> es, suffering from maladaptive daydreaming and Absorption. The eugenicist Verners Kraulis of the University of Latvia noted it was frequently comorbid with Histrionic<unk>  disorder.
Haltlose personality disorder
Simple-type schizophrenia
Dependent personality disorder
Epilepsy
Histrionic personality disorder
Attention deficit hyperactivity disorder
Self-defeating personality disorder
Organic personality disorder