This particular parasite has the effect described in the article. But our gut is full of other species of so-called "parasites" who live in harmony with the host. Human body is a symbiotic organism. So, if this parasite, Toxoplasma gondii, is capable of altering or defining the behavior of the host, can we generalize this observation and say that human behavior is defined by parasites and symbiotic organisms living in the gut?