No this isn’t about Colin Wilson’s Lovecraftian novel The Mind Parasites. It’s about something else.
Suppose that there was a parasite that needed to get into the gut of a cat in order to complete its reproductive cycle.
How can this parasite get into the guts of cats?
Well, a good way would be by first infecting things that cats like to eat–like rats.
But cats don’t like to eat dead mice. They like to eat living ones.
So, if you’re the parasite, you want to do whatever you can to make sure that your mouse gets eaten before it dies a natural death and starts decaying.
The problem is that rats don’t like to be eaten by cats. In fact, they have a panic/avoidance reaction to cats. So strong is this reaction that the scent of cat urine produces a panic reaction (which human scientists use when they need to induce fear in rats) and they flee places cats have marked with cat urine.
If you’re the parasite, that’s no good for you. The rats have an inbuilt cat-avoidance mechanism.
But maybe you can disable it.
Let’s suppose that you form cysts in the rat’s body, including in its brain. Maybe you can turn off its panic/avoidance mechanism.
If so, then your rat will stop being afraid of places that cats have marked and will spend more time in places where cats hang out, thus increasing the chances that cats will eat them.
In fact, maybe you can get the rat to become attracted to the smell of cat urine, causing him to have a suicidal attraction to cats.
If so, good for you.
Now suppose also that you–this parasite–happen to also infect HALF of the human population.
And suppose that there is evidence linking you to schizophrenia in humans.
Is there such a parasite?
There is. It’s called toxoplasma gondii.
Incidentally, the first story mentions several other behavior-altering parasites as well. It does not, however, mention one that I’m curious to know about.
A number of years ago I saw a documentary that talked about a parasite that infects snails and causes them to get eaten by birds. This parasite does two things: It makes the snail have a compulsion to crawl up onto the tops of leaves, so birds can see them, and it makes the snail pulse in weird colors–again to attract the bird’s attention.
If anybody knows the name of that parasite, please let me know.
Not that I have any snails I want to get rid of. It’s just hate not being able to remember the name of something so eerie.