BDNF and schizophrenia: We evaluated cognitive function in 51 patients with schizophrenia using Brief Assessment of Cognition in Schizophrenia (BACS), as well as background information, psychiatric symptoms, plasma catecholamine metabolites—homovanillic acid (HVA), 3-methoxy-4-hydroxyphenylglycol (MHPG)—, and serum brain-derived neurotrophic factor (BDNF).