Take a large pot of water and leave it out in sub-freezing temperatures for a few days. It will turn into a block of ice.
Now take that pot of water and put it on the stove and crank up the flame. Before long, it will start to boil.
Let it cool for a few hours at room temperature and it will resume its familiar liquid form.
If you drop a live fish into liquid water it will swim around and do fishy things.
Things would not go so well if you drop a fish onto a block of ice. Fish are not good skaters.
And if you drop a fish into boiling water…well, the fish will not be very happy.
Think about these states of water as metaphors for how your brain works. A block of ice is a dead brain. A pot of boiling water is a brain having a seizure. Water at room temperature is a normal brain.
The fish represents consciousness.
There is a constant low level of electrical activity among neurons (like water molecules bouncing off of each other, doing the Brownian dance). Intrinsic random neuronal activity is the norm – it keeps a low fire burning all the time. In a sense, the brain has a pilot light.
A bit of randomness is helpful for keeping the mind creative and open to new ways of thinking – consciously and unconsciously. Like the ever-present force of natural selection that curates random mutation in genetic evolution, there are dynamical structures in the brain that permit more meaningful, useful energy to percolate from the random background.
Command and control
The majority of the brain’s activity is unconscious. At every second of your life a vast army of dynamical structures are buzzing around, managing the low-level mechanisms of multi-sensory input, attention, memory, and intent. These structures are vast, short-lived, and small. And they are entirely inaccessible to the conscious mind.
The command and control area of the brain is located at the front-top of the neocortex. The signature of consciousness is a network of relatively stable, large-scale dynamical structures, with fractal fingers branching down into the vast network of unconscious structures. The buzz of the unconscious mind percolates and fuses into something usable to the conscious mind. It offers up to the conscious mind a set of data-compressed packets. When the command and control center relaxes, we experience wandering thoughts. And those thoughts wander because the brain’s pilot light provides constant movement.
These ideas are derived from Dehaene’s Consciousness and the Brain.
Surrender to dreaming
When we start falling asleep, the command and control center begins to lose its grip. The backdrop of randomness sometimes makes its way past the fuzzy boundary of our consciousness – creating a half-dreaming state. Eventually, when consciousness loses out, all that is left is this random, low-level buzz of neural activity.
But dreaming is obviously not totally random. Recent memories have an effect…and of course so do old but powerful memories. The physical structure of the brain does not permit total randomness to stay random for very long. Original randomness is immediately filtered by the innate structure of the brain. And that structure is permeated with the leftovers from a lifetime of experience.
So here’s a takeaway from recent neuroscience, inspired by the findings of Stanislas Dehaene: WE ARE ALWAYS DREAMING. That is because the unconscious brain is continually in flux. What we recognize as dreaming is merely the result of lifting the constraints imposed by the conscious mind – revealing an ocean – flowing in many directions.
The unconscious brain can contribute to a more creative life. And a good night’s sleep keeps the conscious mind out of the way while the stuff gathered in wakefulness is given a chance to float around in the unconscious ocean. While in the ocean, it either dissolves away or settles into functional memory – kicking out an occasional dream in the process.