Friday, 4 August 2017

The tautology criticism yet again

It's frustrating:: critics keep repeating the same long-debunked objections to memetics. Jerry Coyne is one of the latest to raise the objection that memetics is an empty tautology:

“Memetics” is a weak analogy to natural selection that adds nothing except tautology to our view of how human culture evolves. Memetics boils down to this: memes spread because they have properties that allow them to spread.
As any scientific historian will tell you, Darwin's theory faced exactly the same bogus criticism. Critics argued that "survival of the fittest" was a tautology because fitness was defined in terms of who survived. Any evolutionist should be able to explain what is wrong with that argument: "fitness" can be taken to refer to "expected fitness" - as opposed to fitness measured after the fact. Then it isn't a tautology any more.

The exact same reply works for cultural evolution: to make testable predictions, use expected fitnesses.

I have seen much the same objection raised to the Price equation and Hamilton's rule. These have been criticised as tautologies by Martin Nowak and Edward Wilson among others. This criticism ought to be dead these days, but like a zombie, it refuses to lie down.

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