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The evolution of nice

The evolution of nice

Last updated on: January 2, 2015 at 10:51 pm by Epiphenom

The evolution of nice 2015-01-02T22:51:15+01:00 Epiphenom

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Most people reading this blog will have heard of the “selfish gene” – the idea, formally defined by Hamilton and popularised by Dawkins, that what matters from the perspective of evolution is not organisms, but genes.

Those genes that maximise their chances of survival – regardless of what happens to individuals – will be the ones that come to predominate.

It comes in for a lot of flack, mostly from people who wrongly equate selfish genes with selfish people. To be fair, there is also a lot of confusion over terms, with old ideas being reinvented under new terms – like “group selection”.

Stuart West, an evolutionary biologist at Oxford University in the UK, is here to put us straight. In a recent paper written specifically with social scientists in mind, he lays down the power of the selfish gene. It’s a great paper that takes a look at why so many misconceptions have taken hold and lays out, in non-specialist language, the reasons why most criticisms of the ‘selfish gene’ are the a result of confusion rather than insight. Anybody who’s interested in the evolution of human altruism should read it!

Most people with an interest in evolution understand why selfish genes do not mean selfish individuals. It’s clear that selfish genes will benefit from co-operation (you scratch my back and I’ll scratch yours, also known as reciprocity), and kin selection (as the biologist JBS Haldane famously put it, “I would lay down my life for two brothers or eight cousins”).

What most people may not know (I certainly didn’t before reading West’s article) is that these, in fact, are the sole genetic basis for altruism (barring some esoteric mathematical possibilities of little practical significance). But if that’s the case, how do you get from here to the apparently completely selfless altruism sometimes seen in humans? How come we are kind to strangers?

Well, it really is all to do with how humans work together in groups.

You scratch my back and I’ll scratch Bob’s

Reciprocity doesn’t need to be direct to be effective. If, by sharing with you I help to set up a virtuous circle, that will likely result in some benefit to me down the line. This has been seen in practice, with virtuous deeds propagating out to at least three degrees of separation.

In group life, the issue is even clearer. If my deeds help the group to survive and grow, then I will benefit. From a genetic perspective, it doesn’t matter that most of the benefit goes to others – so long as I also get some overall survival benefit.

I would lay down my life for eight cousins… or the bloke who lives next door

Throughout most of human existence, we’ve lived in small groups and not travelled much. What that means is that, for our ancestors, pretty much everyone they met was a close genetic relative. Even if they were not related in any formal sense – not brothers, or cousins, for example – they would still be carrying similar genes.

And that means that your ‘kin, from a genetic standpoint, is likely to be anyone who’s in your group. Even people in neighbouring groups are going to be closely related.

So evolution would favour genes that promote altruism to anyone nearby – since they likely carry the same genes. It won’t be perfect, but so long as migration is low, it’s a good enough rule of thumb.

What’s this got to do with religion?

It’s popular at the moment to talk about religion in terms of ‘gene-culture co-evolution’. The idea behind this is that religion is a cultural adaptation that builds upon a bunch of otherwise unrelated psychological misfirings to promote pro-social behaviour. Since cultures that are pro-social are more successful, religion spreads.

All well and good, but the question then is, what kind of altruism does religion promote? If it promotes the kind of altruism that is directed towards neighbours, then it’s working together with evolution, and so the two can co-evolve.

But religion that promotes more general altruism – ‘universal love’ – is not going to be favoured, at least from an evolutionary perspective.

Of course, in the modern world we see a lot of both kinds of religion. The challenge for anyone trying to explain religion in terms of evolutionary psychology is to explain this!

West, S., El Mouden, C., & Gardner, A. (2010). Sixteen common misconceptions about the evolution of cooperation in humans Evolution and Human Behavior DOI: 10.1016/j.evolhumbehav.2010.08.001

This article by Tom Rees was first published on Epiphenom. It is licensed under Creative Commons.

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