Human identity, the idea that defines each and every one of us, could be facing an unprecedented crisis.
It is a crisis that would threaten long-held notions of who we are, what we do and how we behave.
It goes right to the heart – or the head – of us all. This crisis could reshape how we interact with each other, alter what makes us happy, and modify our capacity for reaching our full potential as individuals.
And it’s caused by one simple fact: the human brain, that most sensitive of organs, is under threat from the modern world.
Unless we wake up to the damage that the gadget-filled, pharmaceutically-enhanced 21st century is doing to our brains, we could be sleepwalking towards a future in which neuro-chip technology blurs the line between living and non-living machines, and between our bodies and the outside world.
It would be a world where such devices could enhance our muscle power, or our senses, beyond the norm, and where we all take a daily cocktail of drugs to control our moods and performance.
Already, an electronic chip is being developed that could allow a paralysed patient to move a robotic limb just by thinking about it. As for drug manipulated moods, they’re already with us – although so far only to a medically prescribed extent.
Increasing numbers of people already take Prozac for depression, Paxil as an antidote for shyness, and give Ritalin to children to improve their concentration. But what if there were still more pills to enhance or “correct” a range of other specific mental functions?
What would such aspirations to be “perfect” or “better” do to our notions of identity, and what would it do to those who could not get their hands on the pills? Would some finally have become more equal than others, as George Orwell always feared?
Of course, there are benefits from technical progress – but there are great dangers as well, and I believe that we are seeing some of those today.
I’m a neuroscientist and my day-to-day research at Oxford University strives for an ever greater understanding – and therefore maybe, one day, a cure – for Alzheimer’s disease.
But one vital fact I have learnt is that the brain is not the unchanging organ that we might imagine. It not only goes on developing, changing and, in some tragic cases, eventually deteriorating with age, it is also substantially shaped by what we do to it and by the experience of daily life. When I say “shaped”, I’m not talking figuratively or metaphorically; I’m talking literally. At a microcellular level, the infinitely complex network of nerve cells that make up the constituent parts of the brain actually change in response to certain experiences and stimuli.
The brain, in other words, is malleable – not just in early childhood but right up to early adulthood, and, in certain instances, beyond. The surrounding environment has a huge impact both on the way our brains develop and how that brain is transformed into a unique human mind.
Of course, there’s nothing new about that: human brains have been changing, adapting and developing in response to outside stimuli for centuries.
What prompted me to write my book is that the pace of change in the outside environment and in the development of new technologies has increased dramatically. This will affect our brains over the next 100 years in ways we might never have imagined.
Our brains are under the influence of an ever- expanding world of new technology: multichannel television, video games, MP3 players, the internet, wireless networks, Bluetooth links – the list goes on and on.
But our modern brains are also having to adapt to other 21st century intrusions, some of which, such as prescribed drugs like Ritalin and Prozac, are supposed to be of benefit, and some of which, such as widelyavailable illegal drugs like cannabis and heroin, are not.
Electronic devices and pharmaceutical drugs all have an impact on the micro- cellular structure and complex biochemistry of our brains. And that, in turn, affects our personality, our behaviour and our characteristics. In short, the modern world could well be altering our human identity.
Three hundred years ago, our notions of human identity were vastly simpler: we were defined by the family we were born into and our position within that family. Social advancement was nigh on impossible and the concept of “individuality” took a back seat.
That only arrived with the Industrial Revolution, which for the first time offered rewards for initiative, ingenuity and ambition. Suddenly, people had their own life stories – ones which could be shaped by their own thoughts and actions. For the first time, individuals had a real sense of self.
But with our brains now under such widespread attack from the modern world, there’s a danger that that cherished sense of self could be diminished or even lost.
Anyone who doubts the malleability of the adult brain should consider a startling piece of research conducted at Harvard Medical School. There, a group of adult volunteers, none of whom could previously play the piano, were split into three groups.
The first group were taken into a room with a piano and given intensive piano practise for five days. The second group were taken into an identical room with an identical piano – but had nothing to do with the instrument at all.
And the third group were taken into an identical room with an identical piano and were then told that for the next five days they had to just imagine they were practising piano exercises.
The resultant brain scans were extraordinary. Not surprisingly, the brains of those who simply sat in the same room as the piano hadn’t changed at all.
Equally unsurprising was the fact that those who had performed the piano exercises saw marked structural changes in the area of the brain associated with finger movement.
But what was truly astonishing was that the group who had merely imagined doing the piano exercises saw changes in brain structure that were almost as pronounced as those that had actually had lessons. “The power of imagination” is not a metaphor, it seems; it’s real, and has a physical basis in your brain.