The human mind is a complex biological machine. Much like its anthropogenic mechanical counterparts, if you reproduce it with infinite accuracy, the replica will be infinitely indistinguishable from the original.
In the case of the human mind, if there was a machine to reproduce my body both perfectly and instantaneously, and in which our exit from it was at random ends of a symmetrical room, there would be nothing to distinguish me from my copy. He would be every bit me as I – identical childhood memories, identical views, identical fears, identical speech synchronicities. At that moment in time of our exit from this imaginary contraption, my will would be known in its entirety to the person at the other end of the room.
Now imagine a computer simulation of a brain. My brain to be precise, with its exact genetic makeup stored in its vast data banks. Were you to simulate my life’s events with perfection to this virtual brain, including not just sensory inputs (sight, smells) but chemical influences as well (recreational drugs, hormones) you would also end up with a being that would be indistinguishable from myself in its thoughts. And were you to peek inside of it at any point in time, you would know exactly what I wanted at that time. My will. Were you to simulate all possible future outcomes, one simulated path would yield my will for the rest of my existence.
In fact, were you able to simulate the universe with perfect precision, in its entirety, you would know the will of every individual that inhabits the Earth. Not only that, but you would predict correctly all of their decisions for the rest of their life. And those of their children. And those of their children.
A device that could manage such a thing is impossible, as it would by definition require more matter than that which exists in the universe, but it does illustrate that your will is not open to independent choice. What you decide is entirely predictable and based on your history and those of your surroundings. Not a single person on this planet escapes this predictability, because they are the sum of their parts, organisms consisting of a series of interactions on a variety of scales.
Interactions that are no different at its essence than the gravitational pull that one body exerts on another. The only reason we don’t predict our behaviour with the same ease is because we consist of trillions of interactions from processes not all so clearly understood.
I’ve always defined free will as this idea that we had a choice that was up to us. That were you to relive the history of this planet, the outcome would change every time. This is just not so. And so if we are without a will that has no independence from our personal history, then ascribing a value to choice is futile, for the entirety of our life could be predicted with perfect precision from before its very inception.
As you finish reading my thoughts on the matter, you might take this a number of ways. How you interpret it is going to be partly up to your genetics, upbringing, what you ate that day, and interactions with other people who are subject to the same factors. You may choose to see it as rubbish, but my point is that were I to know you perfectly, I would have been able to tell you that you’d see it that way ahead of time. That you’d see it any differently wasn’t ever truly an option to begin with – which is precisely my point.
