Given the importance of theory of mind for healthy social functioning, it is not surprising that individuals with sociability disorders, such as schizophrenia, drug and suicide executants [26]–[28], perform poorly on theory of mind tasks, we assume the seven SNPs on the DA-related COMT gene discussed above (rs4680, rs4633, rs2020917, rs2239393, rs737865, rs174699 and rs5993883) might be associated with ToM ability. This evidence concerns the gene COMT and schizophrenia.