Among the patients with geriatric psychiatric disorders included in this study, there were patients with abnormalities on both 123I-MIBG scintigraphy and DAT-SPECT, and patients with normal 123I-MIBG scintigraphy and abnormal DAT-SPECT, but none of the patients had abnormal 123I-MIBG scintigraphy and normal DAT-SPECT (figure 2). The gene discussed is SLC6A3; the disease is psychiatric disorder.