Recent studies have found that genetic polymorphisms in the OXTR and OXT genes in humans have been significantly related to schizophrenia and that OXTR and OXT gene variants have been involved in schizophrenia vulnerability and warrant independent replication (Souza et al., 2010; Teltsh et al., 2012; Montag et al., 2013). This evidence concerns the gene OXTR and schizophrenia.