Humming along….

The human brain is able to store and retrieve memories spanning the decades of an individual life. This occurs despite the exchange, death and constant rearrangement of our neurons. Which raises the question of how? In the hard drives of modern computers – classical or quantum – data is stored in physical bytes (or qubits). Data is written to them and retrieved from them. They can be re-written but the bits themselves do not otherwise change. If one does change through damage or failure, that bit of information is – generally speaking and leaving aside backups – lost. Computer memory is hard. Ours is soft, organic. Amidst the constant comings and goings of millions of nerve cells, our memories – our very identity and sense of self – remains constant (within the margins of error associated with life and aging). It’s a marvel of evolution, really.

According to a recent study, we owe this happy state of affairs to the fact that “as individual neurons die, our neural networks readjust, fine-tuning their connections to sustain optimal data transmission.” It’s a matter of individual nerve cells and networks of same being both excited and inhibited from discharging, thus maintaining a dynamic balance. Through this process, the entire system (networks of networks) achieves “criticality’ – sustaining an overall state that apparently maintains the data structure despite changes affecting the underlying organic bits. What this means is something like this: our inbuilt self-regulating rhythm of neural activity at the individual nerve, synapse and network levels tends towards an optimal level of brain-wide activity. That allows us to remember stuff even as nerve connections change. It’s like the brain is constantly humming to itself the story of our lives. The humming is the basis of mind and memory.

While one might take the notion of this “humming” as simply a metaphor, the researchers suggest that the mechanism they hypothesize also may explain consciousness. But it seems to me this cannot be the case. Ever listen to a gurgling stream? It kinda hums too. But a stream – okay, as far as we know – is not conscious. But we are. I hum therefore I am.

Light Ages and Dark Ages

Read recently a dystopic sci-fi short story set near the end of this century in which a floating city of refugees is overturned by one of the then frequent super typhoons in the Philippine archipelago. The “hero” then must flee from super biotech Chinese police. Nothing about the story line offered reason to look forward to the world that will be brought about by climate change, environmental damage, rising sea-levels and technology-enabled authoritarianism. Indeed, the end of the century will most probably be one of desperation, displacement, disease, poverty and death for billions. Made me wonder what is the meaning and purpose of any of the lives we live now if it leads to this. The answer seems to me to be that there is no meaning but there may be purpose.

Most who live in the wealthy countries of North America, Western Europe and the Pacific Rim enjoy lives of security, well-being, comfort and accomplishment. In the past 200 years, advances in industry, agriculture, transportation, and technology have improved the lives of many others and reduced poverty globally. While not everyone shares in this progress, collectively, the human race has never had it better. But the good times and bad times come in waves – light ages followed by dark ages – and the next one may indeed be a super typhoon.

Throughout history, periods during which many lived relatively well are followed by times of collapse. During the golden age of Rome, its citizens enjoyed relative stability and comfort. When Rome fell, Europe entered the centuries of the dark ages. Other civilizations rose and fell in their own spaces and times. This was probably true in prehistory as well. Homo sapiens almost went extinct at least twice before: around 195,000 years ago and again some 70,000 years ago. Both times it took hundreds to thousands of years to recover. We now live in a global civilization that has entered the age we created from scratch, the Anthropocene. When our global light age ends, the dark age will therefore also be globalized.

What does this mean for those of us alive now? Well, we can enjoy what we have. Beyond that, nothing. Ages swing from good to bad and back again. It seems likely they will continue to do so. None of this has any meaning, it just is. At most, it has perhaps been the engine of human evolution as overcoming the past dark age allows us to rise a little bit further in the next light one. But we can not claim credit for our relative well-being. We were just born lucky. And we also cannot be blamed for the past centuries of burning fossil fuel and despoiling nature. We were merely alive when the bill came due. But we can still have purpose. At some point in the next century, humanity will reach a new equilibrium with the changed earth. So we can try to live more sustainably now and do everything we can to ready the world and the next generations for what is to come so that the next age is a light one.