In addition, the absence of association between cognitive function scores and plasma oxytocin levels is consistent with a previous study reported that no association was observed between plasma oxytocin levels and neurocognition (n = 34),34 whereas it is somewhat inconsistent with the association of plasma oxytocin levels with processing speed and working memory (n = 30)35 in patients with schizophrenia. This evidence concerns the gene OXT and schizophrenia.