Yeetong et al. (2013) reported a large 3-generation Thai family in which 13 individuals had adult-onset cortical tremor, 7 of whom also had generalized seizures. The average age of onset was 19.5 years (range 10-33) for tremor and ... Yeetong et al. (2013) reported a large 3-generation Thai family in which 13 individuals had adult-onset cortical tremor, 7 of whom also had generalized seizures. The average age of onset was 19.5 years (range 10-33) for tremor and 25 years (range 19-33) for seizures. Only 1 patient had onset of seizures before tremor. The seizures were well-controlled, and none of the patients had cognitive impairment. Electrophysiologic studies confirmed the cortical origin of the myoclonus in most patients. Among 10 patients with EEG studies, 9 had spike and wave or polyspike and wave discharges, and 7 had multifocal discharges that corresponded with contralateral jerky movement and photosensitivity. Seven patients had increased amplitudes of cortical somatosensory evoked potentials, and all had the C-reflex. Two patients showed premyoclonic cortical discharges detected by jerk-locked back averaging.