The Runaway Species. David Eagleman
but they morph. Too much predictability and we tune out; too much surprise and we become disoriented. As we’ll see in the coming chapters, creativity lives in that tension.
The exploration/exploitation tradeoff also explains why our world is so densely populated with skeuomorphs: features that imitate the design of what has come before. Consider that when the iPad was introduced it featured a “wooden” bookshelf with “books” on it – and the programmers went to great lengths to make the “pages” turn when you swiped your finger. Why not simply redefine a book for the digital era? Because that’s not what made customers comfortable; they required a connection to what had come before.
Even as we move from one technology to the next, we establish ties with the old, marking a clear path from what was to what is. On the Apple Watch, the “Digital Crown” looks like the knob used to move the hands and wind the springs on an analog timepiece. In an interview with the New Yorker, designer Jonathan Ive said that he placed the knob slightly off-center to make it “strangely familiar.” If he had centered it, users would have expected it to perform its original function; had he removed it, the watch wouldn’t have looked enough like a watch.5 Skeuomorphs temper the new with the familiar.
Our smartphones are packed with skeuomorphs. To place a call, we touch an icon of an old phone handset with an extruded earpiece and mouthpiece – a profile that departed the technology landscape long ago. The camera on your smartphone plays an audio file of a shutter sound, even though digital cameras don’t have mechanical shutters. We delete the zeros and ones of our apps by dragging them to the “trash can.” We save files by clicking on the image of a floppy disk – an artifact that has gone the way of the mastodon. We purchase items online by dropping them into a “shopping cart.” Such ties create a smooth transition from the past to the present. Even our most modern tech is tethered with an umbilical cord to its history.
The exploration/exploitation trade-off is not unique to humans, but while generations of squirrels have poked around in different bushes, humans have taken over the planet with their technology. So there’s something very special about the human brain. What is it?
WHY ZOMBIES DON’T DO WEDDINGS AND BAR MITZVAHS
If you sat down for dinner with a zombie, you would not expect to be impressed with a creative idea. Their behaviors are automatized: they are only running pre-configured routines. That’s why zombies don’t skateboard, write memoirs, launch ships to the moon, or change their hairstyles.
Make-believe though they are, zombies show us something important about the natural world: creatures throughout the animal kingdom run mostly on automated behavior. Consider a honeybee. A stimulus leads to the same reaction, every time, enabling the bee to negotiate such options as land on blue flower, land on yellow flower, attack, fly away. But why doesn’t a bee think creatively? Because its neurons are fixed into place and pass signals from input to output like firefighters passing water pails in a bucket brigade.6 In the bee’s brain these brigades begin to form before birth: chemical signals determine the routes of the neurons, and thus build the different brain regions associated with movement, hearing, vision, smell, and so on. Even when it is exploring new territory, the bee is operating largely on auto-pilot. You can’t reason with a bee any more than you can with a zombie: it is a biological machine, with its thinking hard-wired by millions of years of evolution.
We have quite a bit of the bee in us: the same sort of neural machinery allows us to have our massive portfolio of instinctual behaviors, from walking to chewing to ducking to digesting. And even as we learn new skills, we tend to streamline them into habits rapidly. When we learn how to ride a bicycle, drive a car, use a spoon, or type on a keyboard, we burn the task into fast pathways in the neural circuitry.7 The most rapid conduit becomes favored over other solutions, minimizing the brain’s chance of making an error. Neurons that are not required for that task are no longer triggered.
If the story ended there, the human ecosystem as we know it wouldn’t exist: we wouldn’t have sonnets, helicopters, pogo sticks, jazz, taco stands, flags, kaleidoscopes, confetti, or mixed drinks. So what’s the difference between a bee brain and ours? While a bee brain has one million neurons, a human one has one hundred billion, giving us a larger repertoire of behaviors. And we’re privileged in another way, too: not only in the quantity, but the organization of those neurons. Specifically, we have more brain cells between sensation (what’s out there?) and action (this is what I’m going to do). This allows us to take in a situation, chew on it, think through alternatives, and (if necessary) take action. The majority of our lives take place in the neural neighborhoods between sensing and doing. This is what allows us to move from the reflexive to the inventive.
The massive expansion of the human cortex unhooked huge swaths of neurons from early chemical signals – hence these areas could form more flexible connections. Having so many “uncommitted” neurons gives humans a mental agility other species don’t have. It makes us capable of mediated behaviors.
Mediated (as opposed to automated) behaviors involve thought and foresight: understanding a poem, navigating a difficult conversation with a friend, generating a new solution to a problem. That kind of thinking involves seeking out new paths for innovative ideas. Rather than a push-button response, the neural chatter is like parliamentary debate.8 Everyone joins in the discussion. Coalitions form. When a strong consensus emerges, an idea may rise to conscious awareness, but what can feel like a sudden realization actually depends on extensive internal debate. Most importantly, the next time we ask the same question, the answer might be different. We wouldn’t expect bees to enchant their queen with A Thousand and One Nights of stories; instead, it would just be the same night over and over, because their brains follow identical pathways each time. Thanks to our improvisatory neural architecture, we can weave tales and remodel everything around us.
Humans live inside a competition between automated behavior, which reflects habits, and mediated behavior, which defeats them. Should the brain streamline a neural network for efficiency, or arborize it for flexibility? We depend on being able to do both. Automated behavior gives us expertise: when the sculptor chisels, the architect builds a model or the scientist conducts an experiment, practiced dexterity helps to make new outcomes possible. If we can’t execute our new ideas, we struggle to bring them to life. But automated behavior can’t innovate. Mediated behavior is how we generate novelty. It is the neurological basis of creativity. As Arthur Koestler said, “Creativity is the breaking of habits through originality.” Or as inventor Charles Kettering put it, “Get off Route 35.”
SIMULATING THE FUTURE(S)
The giant number of brain cells interposed between stimulus and action is a critical contributor to the massive creativity of our species. It is what allows us to consider possibilities beyond what is right in front of us. And that’s a large part of the magic of human brains: we relentlessly simulate what-ifs.
In fact, this is one of the key businesses of intelligent brains: the simulation of possible futures.9 Should I nod in agreement, or tell the boss that it’s a dumb idea? What would surprise my spouse for our anniversary? Will I enjoy Chinese or Italian or Mexican for dinner tonight? If I get the job, should I live in a home in the Valley or an apartment in the city? We can’t test every conceivable action to understand the outcomes, so we run simulations internally. All but one of those scenarios won’t actually happen – or maybe none of them will – but by preparing ourselves for the alternatives, we’re able to more flexibly respond to the future. This sensitivity marks the major change that allowed us to become cognitively modern humans. We are masters at generating alternative realities, taking what is and transforming it into a panoply of what-ifs.
We are drawn to future simulations early in life: pretend play is a universal feature of human development.10 A child’s mind swirls with visions of becoming President, hibernating on the way to Mars, heroically somersaulting during a