BBC Future column: why are we so curious?

My column for BBC Future from last week. The original is here.


Evolution made us the ultimate learning machines, and the ultimate learning machines need to be oiled by curiosity.

I hate to disappoint you, but whatever your ambitions, whatever your long-term goals, I’m pretty sure that reading this column isn’t going to further them. It won’t stop you feeling hungry. It won’t provide any information that might save your life. It’s unlikely to make you attractive to the opposite sex.

And yet if I were to say that I will teach you a valuable lesson about your inner child, I hope you will want to carry on reading, driven by nothing more than your curiosity to find out a little more. What could be going on in your brain to make you so inquisitive?

We humans have a deeply curious nature, and more often than not it is about the minor tittle-tattle in our lives. Our curiosity has us doing utterly unproductive things like reading news about people we will never meet, learning topics we will never have use for, or exploring places we will never come back to. We just love to know the answers to things, even if there’s no obvious benefit.

From the perspective of evolution this appears to be something of a mystery. We associate evolution with ‘survival-of-the-fittest’ traits that support the essentials of day-to-day survival and reproduction. So why did we evolve to waste so much time? Shouldn’t evolution have selected for a species which was – you know – a bit more focussed?


Child’s play

The roots of our peculiar curiosity can be linked to a trait of the human species call neoteny. This is a term from evolutionary theory that means the “retention of juvenile characteristics”. It means that as a species we are more child-like than other mammals. Being relatively hairless is one physical example. A large brain relative to body size is another. Our lifelong curiosity and playfulness is a behavioural characteristic of neoteny.

Neoteny is a short-cut taken by evolution – a route that brings about a whole bundle of changes in one go, rather than selecting for them one by one. Evolution, by making us a more juvenile species, has made us weaker than our primate cousins, but it has also given us our child’s curiosity, our capacity to learn and our deep sense of attachment to each other.

And of course the lifelong capacity to learn is the reason why neoteny has worked so well for our species. Our extended childhood means we can absorb so much more from our environment, including our shared culture. Even in adulthood we can pick up new ways of doing things and new ways of thinking, allowing us to adapt to new circumstances.


Exploration bonus
In the world of artificial intelligence, computer scientists have explored how behaviour evolves when guided by different learning algorithms. An important result is that even the best learning algorithms fall down if they are not encouraged to explore a little. Without a little something to distract them from what they should be doing, these algorithms get stuck in a rut, relying on the same responses time and time again.

Computer scientists have learnt to adjust how these algorithms rate different possible actions with an ‘exploration bonus’ – that is, a reward just for trying something new. Weighted like this, the algorithms then occasionally leave the beaten track to explore. These exploratory actions cost them some opportunities, but leave them better off in the long run because they’ve gain knowledge about what they might do, even if it didn’t benefit them immediately.

The implication for the evolution of our own brain is clear. Curiosity is nature’s built-in exploration bonus. We’re evolved to leave the beaten track, to try things out, to get distracted and generally look like we’re wasting time. Maybe we are wasting time today, but the learning algorithms in our brain know that something we learnt by chance today will come in useful tomorrow.

Obviously it would be best if we knew what we needed to know, and just concentrated on that. Fortunately, in a complex world it is impossible to know what might be useful in the future. And thank goodness – otherwise we would have evolved to be a deadly-boring species which never wanted to get lost, never tried things to just see what happened or did things for the hell of it.

Evolution made us the ultimate learning machines, and the ultimate learning machines need a healthy dash of curiosity to help us take full advantage of this learning capacity.

Or, as Kurt Vonnegut said, “We are here on Earth to fart around. Don’t let anybody tell you any different.”

11 thoughts on “BBC Future column: why are we so curious?”

  1. Very fun informative read. As an Intelligent Design person, I disagree with the paragraph about evolution creating our destiny. I am however committing the Kurt Vonnegut quote to memory. Great article!

  2. Thanks so much for this intelligent read. Curiosity is one of my main drivers for accomplishimg things, not as a distraction (although it definitely does that too) but i try to stay curious about what it will feel like to accomplish my goal. I have to stay curious enough to keep working at it.

    I wonder what it will be like when my life is different?
    I’m so curious that I’m going to make it happen to find out.

  3. “Shouldn’t evolution have selected for a species which was – you know – a bit more focussed?”

    Evolution has no purpose. There are no characteristics evolution “should” select for except for those that support successful breeding and these are almost always discoverable only after the fact.

    Otherwise it’s only “Just So” stories.

    Nor am I convinced that neoteny endows our species with curiosity. The adults of many species exhibit curiosity. My kids kept rats and they certainly did.

  4. Compare and contrast:

    “Shouldn’t gravity have made all the water flow into the oceans?”

    Gravity has no purpose

  5. Speaking of useless surfing, a coworker mentioned a hypothesis that humans evolved to read. Could that be even remotely correct? Could the language “instinct” explain this? Digital Nation aside, it might explain why people spend so much time on the internet.

  6. Great article! So fun to touch on the subject of understanding how and possibly “why” our brains work the way they do. Curious creatures leave room for discovery and excitement. Continue the stimulation of curiosity of our environment. You only live once… That you remember.. 🙂

  7. I have always wondered how you guys able to see the things around you have no purpose. A simple flower has many many purposes, an oxygen atom, a blood cell has many purposes but “evolution” has none? Can’t you really see that this world is designed by someone, or you just deny to see that?

    1. In a guess, I would say a skeptic mind about even our own thoughts to the point of doubt of the self and all that it means to observe the world without unbreakable ground to stand upon.

      I am saying that everything is up for debate.
      Even the senseless basic things as breathing oxygen.

      However, I would not want to argue for either way, or any way, if I could avoid it.

      Which is why I label it a guess and nothing more,
      I also find it incorrectly versed when you write “you guys”. There may be similarities, patterns that glow in neon colours and yet, patterns are basic principles, such as how Zebra patterns are formed but we can still not predict, on a living animal, where the actual stripes will appear.

      Whether this is because our knowledge is limited, or the world progresses differently than what a purpose-minded person would expect, I have no clue at all.

      This is my honest guess and I cannot vouch for anything that is up to other scrutinizing eyes but my own.

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