The subjects were 19 patients with schizophrenia (SZ group) and 19 healthy controls (HC group; Table 1). The subjects were diagnosed by two independent well‐trained psychiatrists based on the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (APA, 1994), and were recruited from Wakayama Medical University Hospital. Patients with comorbid psychiatric, neurological, or medical illness, or those with substance or alcohol abuse were excluded from the study. All patients were on antipsychotic medication. Equivalent doses of antipsychotics were calculated using the equivalent conversion table originally reported by Inagaki and Inada (Inada & Inagaki, 2015). This study was approved by the Ethics Committee of Wakayama Medical University, and written informed consent was obtained from all subjects.
