From then onwards Padgett’s world was overlaid with geometric shapes and gridlines. He became obsessed with maths and is now renowned for his drawings of formulas such as Pi. Today he’s incredulous that he once didn’t know what a tangent was. “I do feel like two people, and I’ve had my mum and my dad say that. It’s like having two separate kids,” he says.
Why does this happen? How does it work? And what does it teach us about what makes geniuses special?
There are two leading ideas. The first is that when you’re bashed on the head, the effects are similar to a dose of LSD. Psychedelic drugs are thought to enhance creativity by increasing the levels of serotonin, the so-called “happiness hormone”, in the brain. This leads to “synaesthesia”, in which more than one region is simultaneously activated and senses which are usually separate become linked.
Many people don’t need drugs to experience this: nearly 5% of the population has some form of synaesthesia, with the most common type being “grapheme-colour”, in which words are associated with colours. For example, the actor Geoffrey Rush believes that Mondays are pale blue.
When the brain is injured, dead and dying cells leak serotonin into the surrounding tissue. Physically, this seems to encourage new connections between brain regions, just as with LSD. Mentally, it allows the person to link the seemingly unconnected. “We’ve found permanent changes before – you can actually see connections in the brain that weren’t there before,” says Berit Brogaard, a neuroscientist who directs the Brogaard Lab for Multisensory Research, Florida.
But there is an alternative. The first clue emerged in 1998, when a group of neurologists noticed that five of their patients with dementia were also artists – remarkably good ones. Specifically, they had frontotemporal dementia, which is unusual in that it only affects some parts of the brain. For example, visual creativity may be spared, while language and social skills are progressively destroyed.
One of these was “Patient 5”. At the age of 53 he had enrolled in a short course in drawing at a local park, though he previously had no interest in such things. It just so happened to coincide with the onset of his dementia; a few months later, he was having trouble speaking.
Soon he became irritable and eccentric, developing a compulsion to search for money on the street. As his illness progressed, so did his drawing, advancing from simple still-life paintings to haunting, impressionist depictions of buildings from his childhood.
To find out what was going on, the scientists performed 3D scans of their patients’ brains. In four out of five cases, they found lesions on the left hemisphere. Nobel Prize-winning research from the 1960s shows that the two halves of the brain specialise in different tasks; in general, the right side is home to creativity and the left is the centre of logic and language.
‘Autistic savants’ can have superhuman skills to rival those of the Renaissance polymaths
But the left side is also something of a bully. “It tends to be the dominant brain region,” says Brogaard. “It tends to suppress very marginal types of thinking – highly original, highly creative thinking, because it’s beneficial for our decision-making abilities and our ability to function in normal life.”. The theory goes that as the patients’ left hemispheres became progressively more damaged, their right hemispheres were free to flourish.
