Why We Reason

Lancet flukes (Dicrocelium dendriticum) are a clever little parasite. To reproduce, they find their way into the stomach of a sheep or cow by  commandeering an ant’s brain. Once this happens, ants exhibit strange behavior: they climb up the nearest blade of grass until it falls, then they climb it again, and again. If the flukes are lucky, a grazing farm animal eats the grass along with the ant; a sure win for the flukes, but a sad, and unfortunate loss for the six-legged insect.

Does anything like this happen with human beings? Daniel Dennett thinks so. In the beginning of his book Breaking the Spell, Dennett uses the fluke to suggest that religions survive because they influence their hosts (e.g., people) to do bad things for themselves (e.g., suicide bombing) but good things for the parasite (e.g., Islam). Implicit in Dennett’s example is that religions are…

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