Video 1
The patient’s mother demonstrates intermittent upper-limb jerks of which she is unaware. Mild bradykinesia and dysdiadochokinesia are more prominent in the left upper limb. She is currently receiving antipsychotic medication for the management of schizophrenia.
Video 2
Generalized dystonia with intermittent vocalizations and upper limb–predominant myoclonic jerks before treatment, followed by notable improvement after administration of amantadine and clonazepam.