Limitation of the study
schizophrenia, psychiatric
This study had several limitations. First, the study had a smaller sample size and was a multicenter-controlled study. Although there is no change in the evaluation of psychiatric symptoms and cognitive function in patients between different hospitals in this study, there is heterogeneity in patients in different regions and different hospitals, so there are differences in the baseline course of the two groups of patients. It will be supposed to expand the sample size in follow-up studies to explore further. Secondly, the CANTAB cognitive assessment model selected in this study is incomplete. There are only two dimensions of PRM and IED, and the assessment module should be added to explore the cognitive function effect of tDCS in patients with chronic schizophrenia from different cognitive dimensions, to provide new methods for the treatment of patients.