Several studies showed improvement in higher-order social cognition, particularly in the faux pas recognition task, which reflects the theory of mind, in patients with schizophrenia, after a single dose of 40 IU intranasal oxytocin [17,141,142], except Pedersen et al., who provided 24 IU intranasal oxytocin twice daily for two weeks [123]. Here, OXT is linked to schizophrenia.