What brain scans of rap artists reveal about creativity—and what they do not
December 18, 2012
Even for the
wilderness of human thinking, creative ideas seem to be deliberately designed to defy empirical enquiry. There is something elusive and mystical, perhaps even sacred, about them. So what is a
neuroscientist to do if she wants to study inspiration in the lab, under tightly controlled conditions? Clearly, she cannot simply take volunteers, shove them into the nearest brain scanner and
tell them: now, please be creative! That’s why most paying members of the Society for Neuroscience find the prospect of studying creativity akin to trying to nail jelly to the wall. But don’t
forget: big, intractable problems in science have always been more of a calling.
Previous attempts to tighten the screws on this vexed problem have, even if you allow for some breathers, turned out to be fizzers. Take the gold standard of catching creativity in flagrante: the infamous Alternative Uses Test. In hindsight, it is
easy to see that having a test subject list as many alternative uses of some common object was never going to yield much real-world validity. Think about it. Could we really expect a testing
instrument that asks you to imagine alternative uses of a safety pin to tell an Einstein from a certified public accountant? After a few decades of this kind of myopic research, the cul-de-sac we
stumbled into is plain for everyone to see. While much ink has been spilled over creativity from social, psychological, and historical perspectives, filling shelves of books and articles, we know
next to nothing about the mechanisms, cognitive or neural, that give rise to creativity.
It is high time, then, that neuroscientists become more creative about creativity. A new paper by Liu and his colleagues is a welcome example of just that. It joins what is still a slow trickle of studies taking a
fresh stab at creativity. In this case, the scientists picked freestyle rap as their “task,” a choice both cunning and clever. The entanglement of rap and neuroscience – however irrelevant to the
study’s interesting results – strikes all the right chords for coverage in the tweet-sized attention span of modern news reporting. The next thing in tow, given the drift of things, is surely an
MRI scan showing the brain activity of experts playing Fruit Ninja! One only hopes that in all the brouhaha about the hip-hop brain some relevant characteristics of this behavioral measure are
not lost. Like free jazz improvisation, freestyle rap lends itself nicely to creative expression in the lab because it can be prompted – in this case by asking rappers to improvise rhymes and
lyrical cadences to an 8-bar beat. What’s more, it can easily be contrasted with an appropriate control condition – a set of lyrics already committed to memory and performed to the same beat. The
spontaneous generation of freestyle performance, a common genre of artistic expression, taps into a flow
state and for this special state of consciousness we do seem to understand some of the underlying neurocognitive mechanism.
So what did we learn in this experiment? Quite a bit, as it happens. The key finding is the dissociation of two prefrontal areas during spontaneous composition of artistic content. The medial
prefrontal cortex showed increased activity, and the dorsolateral prefrontal cortex – DLPFC for short – showed decreased activity. While the former has been in the news lately for its association
with various aspects of social cognition – self-perception, self-knowledge, moral decisions, etc. – the DLPFC has long been known to mediate the so-called higher mental functions: executive
attention, working memory, willed action and cognitive control.
Given that creativity is among the most extraordinary capacities of the human mind, one would think that our most highly prized piece of cortical real estate, the DLPFC, would need to run on all
cylinders here. But this does not seem to be the case. Turns out, there is already a term for this phenomenon: Transient
hypofrontality. It refers to the temporary downregulation of hyper-analytical and metacognitive processes which – oftentimes needlessly – limit the solutions space in a creative endeavor.
With these toned down, more remote associations can occur. Importantly, this new experiment confirms this hypothesis. In addition, it shows that the heightened activation in the medial prefrontal
cortex is accompanied by similar increases in activation in language areas (around the lateral fissure), the amygdala and the cingulate motor cortex, all of which form a network in which
freestyle artistic expression may unfold.
Unfortunately, and this is the only slip here, the authors seem to fall prey to the monolithic entity fallacy that is so common among people writing about creativity. In discussing the data, they
show the tendency to write about creativity per se, as if
there is only one kind. But the study’s results do not hold when generalized to creativity as a whole. The present experiment evokes only one specific type of creativity, one that is
characterized by spontaneous generation and one that requires immediate expression in the form of motor output. There is quite a bit of evidence to suggest that in other types of creativity the
exact opposite brain pattern emerges. Increased activity in the DLPFC, the very area downregulated in Liu’s study, is upregulated in some forms of
insightful problem solving. Sure, anecdotal stories abound that portray the creative process as effortless, ephemeral and unintentional. From Kekulé’s daydream of whirling snakes forming a
(benzene) ring to Coleridge’s poem Kublai Khan, such flashes of insight are the very cliché of the creative genius.
But it only takes a moment’s reflection to see that the opposite also holds. For all the uplifting stories, the Einsteins riding on beams of light, the Newtons watching falling apples (a myth
likely originating from Voltaire) or the Archimedeses displacing bathwater, creative ideas can just as easily be the result of laborious trial and error, which – clearly – requires the activation
of executive processes in the DLPFC. What would we otherwise make of Edison’s “empirical dragnet” method that yielded a total of 1093 patents; Watson and Crick’s algorithmic approach to testing
the stability of DNA base pairs; Bach’s assembly-line tactic to composing hundreds of cantatas; the imaginative ways in which NASA engineers solved the problems of the otherwise doomed Apollo 13
mission; or the countless occasions each one of us has converged on a creative solution by systematically eliminating alternative possibilities?
The deadly error here is seeing creativity as one thing, but not the other. When it comes to mechanistic explanations, the field of creativity is riddled with examples of such premature category
formations. Open any source on the topic – academic or otherwise – and you will find creativity linked with, say, low arousal, defocused attention, right brains, unconscious processes, lateral
thinking, altered states of consciousness, or mental illness, to name but a few popular duds. Commonsense alone tells us that their opposites are also sources of creative thinking. What has come
into clear focus in recent years is that creativity is too complex, and too distributed in the brain, to be captured in a net held together by such ontological danglers. I hope we do not do this
with the prefrontal cortex.