[The EEG characteristics of patients with Huntington's chorea and their clinically healthy relatives].

Clinical and electroencephalographic examination has involved 170 persons (93 patients with Huntington's chorea and their 77 clinically normal relatives). The overwhelming majority of patients and 37% of their clinically healthy relatives have varying degrees of alpha-activity diminution (in 51% of the patients alpha-activity was totally absent). The degree of alpha-activity significantly correlated with severity of the disease. The above EEG changes, in combination with the findings of other methods of examination, may be also employed in the diagnosis of initial and subclinical manifestations of the disease.