To the Editor We read with interest the report by Pandey and Sarma1 of a patient with an acute left thalamic infarction who developed seemingly purposeless tapping movements in the right hand. In the accompanying video, the movement on day 6 was confined to the right hand, with wrist flexion extension at 4 to 5 Hz and index finger extension.1 On day 10, the movement progressed to include wrist flexion extension, elbow flexion extension, and shoulder internal-external rotation. On day 21, with reduced severity, the movement was again of wrist flexion extension. On day 28, the movement was limited to fingers flexion. At 1-month follow-up, the movement was mild but seemed to be triggered by right index finger extension.
Yi-cheng Tai, Michael Wang Keong Fong, Victor S. C. Fung. Clonic Perseveration vs Stereotypy Phenomenology. JAMA Neurol. 2016;73(2):241. doi:10.1001/jamaneurol.2015.3921