I really hope that they do not. But the article suggests that sometimes organisms are not in charge of their own destiny.
It would make a great SF story:
A parasite is found to attach itself to the human brain possibly changing the hosts brain chemistry. Once the first parasite is found then others are found. The research is inconclusive. Then it is found that the humans have a blind spot in their psyche for what ever parasite or parasites that infect them. What is the long range effects of this symbiosis? Has our intelligence improved to help us or the parasites? Are we really in charge of our destiny?
Why do you do the things you do?
