Critics also say that because his work has focused on higher-functioning individuals with autism spectrum disorders, it requires independent replication with broader samples and that his theories are based on subjective perceptions. In response to some of these criticisms, Baron-Cohen agrees that many of his results have not been replicated, and says that he remains "open minded about these hypotheses until there are sufficient data to evaluate them". Still, he says he doesn't see a problem with introducing theories before definitive evidence has been collected.