The idea of transferring the human mind to a computer, which is interesting but also a little creepy, is known as “mind uploading.” “Think of it as a way of creating a copy of your brain,” explains neuroscientist Dobomir Rakhnev in an article for The Conversation titled “Can you upload a human mind into a computer? A neuroscientist ponders what’s possible“.
We would live there digitally, perhaps forever. We would be self-aware, retain our memories, and feel ourselves. But we would not have a body.
Within this simulated environment, we could do exactly what we do in real life: eat, drive, play sports. We could also do things that are impossible in real life, such as fly or teleport.
The only limit would be what science can realistically simulate. Is it possible? In theory, mind-uploading should be possible, Rakhnev argues.
How is consciousness transferred?
However, creating such a simulation is not simply a matter of computing power. It requires a complete mapping of the brain’s architecture, which includes some 86 billion neurons and trillions of connections.
And each of those neurons is dynamic – it constantly changes the way it functions, based on experiences and the environment.
Rakhnev uses the phrase “scanning billions of pinheads” to describe the scale of the challenge.
Neurons and synapses are as small as a pinhead or smaller, and faithfully reproducing them requires technology infinitely more precise than we have today.
Why isn’t it enough to just copy the brain?
Even if we manage to scan the brain at the molecular level, that alone is not enough. The human brain works in conjunction with the senses and the body. It is not isolated.
Senses such as sight, hearing, touch, but also internal signals such as pain, hunger, or fatigue, shape our mental state.
A consciousness locked in a completely isolated digital universe, without sensory contact, would collapse. The complete absence of stimuli, as psychology has shown, can cause serious mental disorders.
For mind-overloading to work properly, a complete simulation of the body and sensory environment will be required – which also requires enormous computing power and a deep understanding of biology and consciousness.
Technical and ethical hurdles
Even if the technical hurdles are overcome – which is by no means a given – there are also profound philosophical and ethical questions.
Will the digital copy be you or a copy of you? Will it be conscious, or will it simply mimic your behavior? Who will have control over this digital being? Will it have rights?
The prospect of technological “immortality” is alluring, but it also carries risks of social inequality – who will have access to this technology? Will it create a “digital elite” of people who do not die?
From a scientific perspective, perhaps the greatest challenge is to understand exactly how the brain creates thought, consciousness and personality.
At present, scientists cannot reproduce a single functioning neuron, nor can they reliably model the way a human being thinks.
2045; 2145? Or later?
Some scientists, such as Ray Kurzweil, have predicted that mind-uploading could become possible by 2045. Others are more cautious, pushing the timeline to the end of the century or even later.
Rakhnev himself believes that it will probably take more than 100 years to arrive at a reliable and ethically acceptable model of mind-uploading. However, if technological progress continues at the current rate, the first person to live “forever” may already be born.
Future or science fiction?
Mind-uploading remains an extremely complex and distant undertaking, combining neuroscience, artificial intelligence, philosophy and ethics.
While its theoretical basis does not preclude its implementation, its practical realization requires technological leaps that we have not yet achieved. Perhaps one day the idea will cease to be science fiction and become scientific reality. Until then, it remains an impressive promise – and a profound challenge.
