A brain MRI showed no notable abnormalities. Dynamic EEG suggested the presence of sporadic sharp waves in the bilateral occipital and posterior temporal regions during sleep. The titers of anti-GAD antibodies in the patient's serum and cerebrospinal fluid are both measured at 1:10, raising suspicion for epilepsy, Stiff Person Syndrome, and cerebellar ataxia. This evidence concerns the gene GAD1 and cerebellar ataxia.