Persistent dyskinesia.

The author examines several published and unpublished literature concerning the study of tardive dyskinesia from 1967 to 1971. The paper is divided into various sections including the accounted frequency of the said disorder in patients treated with neuroleptic drug and the sample of subjects that were never exposed to the drug, the characteristics of patients with dyskinesia, the onset and evolution of the symptoms, the predisposing factors to the disorder and the possible treatment of tardive dyskinesia. Information regarding the anatomical and biochemical studies related to the condition is also discussed.